1
|
Wen S, Liu J, Lu Y, Dai J, Huang X, An S, Jeppesen E, Liu Z, Du Y. Composition regulates dissolved organic matter adsorption onto iron (oxy)hydroxides and its competition with phosphate: Implications for organic carbon and phosphorus immobilization in lakes. J Environ Sci (China) 2024; 144:159-171. [PMID: 38802228 DOI: 10.1016/j.jes.2023.07.038] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 07/27/2023] [Accepted: 07/30/2023] [Indexed: 05/29/2024]
Abstract
Dissolved organic matter (DOM) is a heterogeneous pool of compounds and exhibits diverse adsorption characteristics with or without phosphorous (P) competition. The impacts of these factors on the burial and mobilization of organic carbon and P in aquatic ecosystems remain uncertain. In this study, an algae-derived DOM (ADOM) and a commercially available humic acid (HA) with distinct compositions were assessed for their adsorption behaviors onto iron (oxy)hydroxides (FeOx), both in the absence and presence of phosphate. ADOM contained less aromatics but more protein-like and highly unsaturated structures with oxygen compounds (HUSO) than HA. The adsorption capacity of FeOx was significantly greater for ADOM than for HA. Protein-like and HUSO compounds in ADOM and humic-like compounds and macromolecular aromatics in HA were preferentially adsorbed by FeOx. Moreover, ADOM demonstrated a stronger inhibitory effect on phosphate adsorption than HA. This observation suggests that the substantial release of autochthonous ADOM by algae could elevate internal P loading and pose challenges for the restoration of restore eutrophic lakes. The presence of phosphate suppressed the adsorption of protein-like compounds in ADOM onto FeOx, resulting in an increase in the relative abundance of protein-like compounds and a decrease in the relative abundance of humic-like compounds in post-adsorption ADOM. In contrast, phosphate exhibited no discernible impact on the compositional fractionation of HA. Collectively, our results show the source-composition characters of DOM influence the immobilization of both DOM and P in aquatic ecosystems through adsorption processes. The preferential adsorption of proteinaceous compounds within ADOM and aromatics within HA highlights the potential for the attachment with FeOx to diminish the original source-specific signatures of DOM, thereby contributing to the shared DOM characteristics observed across diverse aquatic environments.
Collapse
Affiliation(s)
- ShuaiLong Wen
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - JingJing Liu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - YueHan Lu
- Molecular Eco-Geochemistry (MEG) Laboratory, Department of Geological Sciences, The University of Alabama, 2017th Ave, Tuscaloosa, AL 35485, USA
| | - JiaRu Dai
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210008, China
| | - XiuLin Huang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404020, China
| | - ShiLin An
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Erik Jeppesen
- Department of Ecoscience, Aarhus University, Silkeborg 8600, Denmark; Sino-Danish Centre for Education and Research, University of Chinese Academy of Sciences, Beijing 101408, China; Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara 06800, Turkey
| | - ZhengWen Liu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; Sino-Danish Centre for Education and Research, University of Chinese Academy of Sciences, Beijing 101408, China
| | - YingXun Du
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| |
Collapse
|
2
|
Wen Q, Liu N, Qu R, Ge F. High salinity promotes the photoaging of polystyrene microplastics with humic acid in seawater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 901:165741. [PMID: 37487889 DOI: 10.1016/j.scitotenv.2023.165741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 07/06/2023] [Accepted: 07/21/2023] [Indexed: 07/26/2023]
Abstract
The photoaging of microplastics (MPs) accumulated in the sea can be influenced by humic acid (HA). However, the role of salinity cannot be ignored, as it may potentially disrupt the interaction between MPs and HA, thereby altering the photoaging of MPs. Herein, this study investigated how salinity influences the effect of humic acid (HA, derived from lignite) on the photoaging of polystyrene microplastics (PS MPs) in artificial and natural seawater. The results revealed that HA promoted the photoaging of PS MPs under both low (5 PSU) and high salinity (35 PSU) in light conditions (L), reflected in the formation of fragments, the production of oxygen-containing functional groups (OH, CO, and OCO), and the increase in hydrophilicity of PS MPs. Furthermore, high salinity promoted the photoaging of PS MPs with HA more significantly, as evidenced by the similar indicators and the order of oxygen/carbon atom ratio (O/C): L-HA-High (0.15) > L-HA-Low (0.10) > Unaged (0.02). Interestingly, due to the reduction of electrostatic repulsion, the adsorption of HA on photoaged PS MPs in natural and artificial high salinity seawater was 1.77 mg/g and 0.39 mg/g, respectively, which was significantly higher than those PS MPs photoaged in the low salinity seawater. Furthermore, the electron spin resonance (ESR) results confirmed that more hydroxyl radicals (OH) were generated after adsorbing HA under high salinity conditions, thus promoting the fragmentation and oxidation of PS MPs. Overall, our findings highlight the crucial role of salinity in influencing the photoaging of MPs with HA and help to assess the marine risk of MPs accurately.
Collapse
Affiliation(s)
- Qiong Wen
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China
| | - Na Liu
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China
| | - Ruohua Qu
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China
| | - Fei Ge
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China; Hunan Provincial University Key Laboratory for Environmental Behavior and Control Principle of New Pollutants, Xiangtan 411105, China.
| |
Collapse
|
3
|
Kang W, Hu X, Feng R, Wei C, Yu F. DOM Associates with Greenhouse Gas Emissions in Chinese Rivers under Diverse Land Uses. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:15004-15013. [PMID: 37782146 DOI: 10.1021/acs.est.3c03826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
Growing evidence indicates that rivers are hotspots of greenhouse gas (GHG) emissions and play multiple roles in the global carbon budget. However, the roles of terrestrial carbon from land use in river GHG emissions remain largely unknown. We studied the microbial composition, dissolved organic matter (DOM) properties, and GHG emission responses to different landcovers in rivers (n = 100). The bacterial community was mainly constrained by land-use intensity, whereas the fungal community was mainly controlled by DOM chemical composition (e.g., terrestrial DOM with high photoreactivity). Anthropogenic stressors (e.g., land-use intensity, gross regional domestic product, and total population) were the main factors affecting chromophoric DOM (CDOM). DOM biodegradability exhibited a positive correlation with CDOM and contributed to microbial activity for DOM transformation. Variations in CO2 and CH4 emissions were governed by the biodegradation or photomineralization of dissolved organic carbon derived from autotrophic DOM and were indirectly affected by land use via changes in DOM properties and water chemistry. Because the GHG emissions of rivers offset some of the climatic benefits of terrestrial carbon (or ocean) sinks, intensified urban land use inevitably alters carbon cycling and changes the regional microclimate.
Collapse
Affiliation(s)
- Weilu Kang
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Carbon Neutrality Interdisciplinary Science Centre, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Xiangang Hu
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Carbon Neutrality Interdisciplinary Science Centre, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Ruihong Feng
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Carbon Neutrality Interdisciplinary Science Centre, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Changhong Wei
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Carbon Neutrality Interdisciplinary Science Centre, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Fubo Yu
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Carbon Neutrality Interdisciplinary Science Centre, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| |
Collapse
|
4
|
Zhang Q, Demeestere K, De Schamphelaere KAC. Water brownness regulates the bioavailability of a fluoroquinolone antibiotic: UV-absorbance as a predictor of ciprofloxacin ecotoxicity. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 334:122209. [PMID: 37454719 DOI: 10.1016/j.envpol.2023.122209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 07/07/2023] [Accepted: 07/14/2023] [Indexed: 07/18/2023]
Abstract
Dissolved organic carbon (DOC) is a powerful regulator of the ecotoxicity of ciprofloxacin (CIP), a widely applied fluoroquinolone antibiotic. In this study, we investigated the impact of DOC from a variety of sources on CIP bioavailability, using a cyanobacteria growth inhibition test with Microcystis aeruginosa. We analyzed the impact from two perspectives: (1) DOC concentration, and (2) water brownness, defined in this work as the light absorbance of DOC solutions. The toxicity tests were conducted with (1) unprocessed freshwater DOC in the naturally occurring state, (2) DOC extracted from a freshwater stream (Schwarzbach stream, Küchelscheid, Belgium), and (3) the commercial DOC product Suwannee River organic matter. Across all DOC sources investigated, a strong negative correlation was observed between CIP ecotoxicity and light absorbance at four wavelengths across the ultraviolet-visible range (e.g., A350), whereas CIP ecotoxicity correlated poorly with the DOC concentration. In addition, the interactions between CIP and DOC were modelled as a CIP-DOC binding process to allow the quantification of the inhibitory effects of DOC on CIP toxicity via binding constants (Kd,CIPx, with x being the ionic charge + or +/-, L g-1). Processed DOC sources showed higher binding potency than most of the unprocessed DOC sources, suggesting that toxicity tests employing only processed DOC potentially overestimates the impact of DOC in natural environments. Nonetheless, the light absorption coefficient (i.e., ε350) appeared a reliable predictor of the Kd,CIP+/- (and thus of the potential of the DOC source to reduce ecotoxicity of CIP) of both processed and unprocessed DOC. The relationship can be further incorporated into model simulations to estimate CIP bioavailability in dynamic environments. It is concluded that the brownness of water is a better predictor of the impact of DOC on CIP bioavailability than the DOC concentration itself.
Collapse
Affiliation(s)
- Qiyun Zhang
- GhEnToxLab, Department of Animal Science and Aquatic Ecology, Ghent University, Ghent, Belgium; Research Group EnVOC, Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.
| | - Kristof Demeestere
- Research Group EnVOC, Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | | |
Collapse
|
5
|
Liu Y, Hu Y, Yu C, Gao Y, Liu Z, Mostofa KMG, Li S, Hu Y, Yu G. Spatiotemporal optical properties of dissolved organic matter in a sluice-controlled coastal plain river with both salinity and trophic gradients. J Environ Sci (China) 2023; 129:1-15. [PMID: 36804226 DOI: 10.1016/j.jes.2022.09.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 09/21/2022] [Accepted: 09/22/2022] [Indexed: 06/18/2023]
Abstract
Due to the combined effect of sluices and sea tide, the sluice-controlled coastal plain river would be characterized by both trophic state and salinity gradients, affecting the spatiotemporal optical properties of dissolved organic matter (DOM). In this study, we investigated the spatiotemporal variation of water quality parameters and optical properties of DOM in the Haihe River, a representative sluice-controlled coastal plain river in Tianjin, China. A significant salinity gradient and four trophic states were observed in the water body of the Haihe River. Two humic- and one protein-like substances were identified from the DOM by the three-dimensional fluorescence spectra combined with the parallel factor (PARAFAC) analysis. Pearson's correlation analysis and redundancy analysis (RDA) showed that the salinity significantly affected the abundance of chromophoric DOM (CDOM) but did not cause significant changes in the fluorescence optical characteristics. In addition, the effect of Trophic state index (TSI) on the CDOM abundance was greater than that on the fluorescence intensity of fluorescent dissolved organic matter (FDOM). In the water body with both salinity and trophic state gradients, TSI posed a greater influence than salinity on the CDOM abundance. Our results fill the research gap in spatiotemporal DOM characteristics and water quality variation in water bodies with both salinity and trophic state gradients. These results are beneficial for clarifying the joint influence of saline intrusion and sluices on the DOM characteristics and water quality in sluice-controlled coastal plain rivers.
Collapse
Affiliation(s)
- Yu Liu
- School of Earth System Science, Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China.
| | - Yucheng Hu
- Tianjin Hydraulic Science Research Institute, Tianjin 300061, China
| | - Chengxun Yu
- School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300191, China
| | - Yuqi Gao
- School of Mathematics, Tianjin University, Tianjin 300072, China
| | - Zhenying Liu
- School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300191, China
| | - Khan M G Mostofa
- School of Earth System Science, Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China
| | - Siliang Li
- School of Earth System Science, Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China
| | - Yumei Hu
- School of Mathematics, Tianjin University, Tianjin 300072, China
| | - Guanghui Yu
- School of Earth System Science, Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China
| |
Collapse
|
6
|
Zhang Y, Cheng D, Song J, Pang R, Zhang H. How does anthropogenic activity influence the spatial distribution of dissolved organic matter in rivers of a typical basin located in the Loess Plateau, China. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 340:117984. [PMID: 37084646 DOI: 10.1016/j.jenvman.2023.117984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 03/26/2023] [Accepted: 04/18/2023] [Indexed: 05/03/2023]
Abstract
River ecosystems interact strongly with adjacent terrestrial environments and receive dissolved organic matter (DOM) from a variety of sources, all of which are vulnerable to human activities and natural processes. However, it is unclear how and to what extent human and natural factors drive DOM quantity and quality changes in river ecosystems. Here, three fluorescence components were identified via optical techniques, including two humic-like substances and one protein-like component. The protein-like DOM was mainly accumulated in anthropogenically impacted regions, while humic-like components exhibit the opposite trend. Furthermore, the driving mechanisms of both natural and anthropogenic factors on the variations in DOM composition were investigated using partial least squares structural equation modelling (PLS-SEM). Human activities, especially agriculture, positively influence the protein-like DOM directly by enhancing anthropogenic discharge with protein signals and also indirectly by affecting water quality. Water quality directly influences the DOM composition by stimulating in-situ production through a high nutrient load from anthropogenic discharge and inhibiting the microbial humification processes of DOM due to higher salinity levels. The microbial humification processes can also be restricted directly by a shorter water residence time during the DOM transport processes. Furthermore, protein-like DOM was more sensitive to direct anthropogenic discharge than indirect in-situ production (0.34 vs. 0.25), especially from non-point source input (39.1%), implying that agricultural industry optimization may be an efficient way to improve water quality and reduce protein-like DOM accumulation.
Collapse
Affiliation(s)
- Yixuan Zhang
- Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi'an, 710127, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China
| | - Dandong Cheng
- Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi'an, 710127, China
| | - Jinxi Song
- Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi'an, 710127, China.
| | - Rui Pang
- Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi'an, 710127, China
| | - Hangzhen Zhang
- Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi'an, 710127, China
| |
Collapse
|
7
|
Zhou L, Zhou Y, Zhang Y, Wu Y, Jang KS, Spencer RGM, Brookes JD, Jeppesen E. Hydrological Controls on Dissolved Organic Matter Composition throughout the Aquatic Continuum of the Watershed of Selin Co, the Largest Lake on the Tibetan Plateau. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:4668-4678. [PMID: 36892554 DOI: 10.1021/acs.est.2c08257] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Alpine river and lake systems on the Tibetan Plateau are highly sensitive indicators and amplifiers of global climate change and important components of the carbon cycle. Dissolved organic matter (DOM) encompasses organic carbon in aquatic systems, yet knowledge about DOM variation throughout the river-lake aquatic continuum within alpine regions is limited. We used optical spectroscopy, ultrahigh-resolution mass spectrometry (Fourier transform ion cyclotron resonance mass spectrometry), and stable water isotopic measurements to evaluate linkages between DOM composition and hydrological connection. We investigated glacial influences on DOM composition throughout the watershed of Selin Co, including upstream glacier-fed rivers and downstream-linked lakes. We found that the dissolved organic carbon concentration increased, whereas specific ultraviolet absorbance (SUVA254) decreased along the river-lake continuum. Relative to rivers, the downstream lakes had low relative abundances of polyphenolic and condensed aromatic compounds and humic-like substances but increased relative abundances of aliphatics and protein-like compounds. SUVA254 decreased while protein-like components increased with enriched stable water isotope δ2H-H2O, indicating that DOM aromaticity declined while autochthonous production increased along the flow paths. Glacier meltwater contributed to elevated relative abundances of aliphatic and protein-like compounds in headwater streams, while increased relative abundances of aromatics and humic-like DOM were found in glacier-fed lakes than downstream lakes. We conclude that changes in hydrological conditions, including glacier melt driven by a warming climate, will significantly alter DOM composition and potentially their biogeochemical function in surface waters on the Tibetan Plateau.
Collapse
Affiliation(s)
- Lei Zhou
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
- Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Yongqiang Zhou
- Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Yunlin Zhang
- Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Yonghong Wu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Kyoung-Soon Jang
- Bio-Chemical Analysis Team, Korea Basic Science Institute, Cheongju 28119, South Korea
| | - Robert G M Spencer
- Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, Florida 32306, United States
| | - Justin D Brookes
- Water Research Centre, School of Biological Science, The University of Adelaide, 5005 Adelaide, Australia
| | - Erik Jeppesen
- Department of Bioscience and Center for Water Technology (WATEC), Aarhus University, Vejlsøvej 25, DK-8600 Silkeborg, Denmark
- Sino-Danish Centre for Education and Research, Beijing 100190, China
- Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara 06800, Turkey
- Institute of Marine Sciences, Middle East Technical University, Mersin 33731, Turkey
| |
Collapse
|
8
|
Shang Y, Song K, Lai F, Lyu L, Liu G, Fang C, Hou J, Qiang S, Yu X, Wen Z. Remote sensing of fluorescent humification levels and its potential environmental linkages in lakes across China. WATER RESEARCH 2023; 230:119540. [PMID: 36608522 DOI: 10.1016/j.watres.2022.119540] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 12/20/2022] [Accepted: 12/27/2022] [Indexed: 06/17/2023]
Abstract
The pollution or eutrophication affected by dissolved organic matter (DOM) composition and sources of inland waters had attracted concerns from the public and government in China. Combined with remote sensing techniques, the fluorescent DOM (FDOM) parameters accounted for the important part of optical constituent as chromophoric dissolved organic matter (CDOM) was a useful tool to trace relative DOM sources and assess the trophic states for large-scale regions comprehensively and timely. Here, the objective of this research is to calibrate and validate a general model based on Landsat 8 OLI product embedded in Google Earth Engine (GEE) for deriving humification index (HIX) based on EEMs in lakes across China. The Landsat surface reflectance was matched with 1150 pairs fieldtrip samples and the nine sensitive spectral variables with good correlation with HIX were selected as the inputs in machine learning methods. The calibration of XGBoost model (R2 = 0.86, RMSE = 0.29) outperformed other models. Our results indicated that the entire dataset of HIX has a strong association with Landsat reflectance, yielding low root mean square error between measured and predicted HIX (R2 = 0.81, RMSE = 0.42) for lakes in China. Finally, the optimal XGBoost model was used to calculate the spatial distribution of HIX of 2015 and 2020 in typical lakes selected from the Report on the State of the Ecology and Environment in China. The significant decreasing of HIX from 2015 to 2020 with trophic states showed positive control of humification level of lakes based on the published document of Action plan for prevention and control of water pollution in 2015 of China. The calibrated model would greatly facilitate FDOM monitoring in lakes, and provide indicators for relative DOM sources to evaluate the impact of water protection measures or human disturbance effect from Covid-19 lockdown, and offer the government supervision to improve the water quality management for lake ecosystems.
Collapse
Affiliation(s)
- Yingxin Shang
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China
| | - Kaishan Song
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China; School of Environment and Planning, Liaocheng University, Liaocheng 252000, China
| | - Fengfa Lai
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China; Jilin Jianzhu University, China
| | - Lili Lyu
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China
| | - Ge Liu
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China
| | - Chong Fang
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China
| | - Junbin Hou
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China
| | - Sining Qiang
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China
| | | | - Zhidan Wen
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China.
| |
Collapse
|
9
|
Shen J, Song Y, Cheng C, Duan F, Liu C, Chai Y, Wang S, Xiong Q, Wu J. Spectroscopic and compositional profiles of dissolved organic matters in urban snow from 2019 to 2021: Focusing on pollution features identification. WATER RESEARCH 2023; 229:119408. [PMID: 36462254 DOI: 10.1016/j.watres.2022.119408] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 11/20/2022] [Accepted: 11/21/2022] [Indexed: 06/17/2023]
Abstract
Snow owns stronger adsorption capacity for organic pollutants compared with rain. Huge amounts of anthropogenic dissolved organic matters (DOMs) in the atmosphere may enter the water environment with urban snow and increase water pollution risk. Extracting stable pollution features of urban snow is conducive to identifying the urban snow pollution from the water environment. Herein, we systematically explored the spectroscopic and compositional profiles of urban snow in Beijing from three snow events by multiple analytical tools and extracted stable pollution features of urban snow for the first time. Results showed that conventional pollutants with high concentration were detected in urban snow. The fluorescence signals of humic-like and some protein-like materials, the molecular weight distributions of chromophoric DOM at 254 nm and humic-like materials, and 172 kinds of lignin-like molecular formulas were extracted as stable features for urban snow. These stable features of urban snow laid the foundation for the identification of urban snow pollution and the analysis of the impact mechanisms of atmospheric pollution sources on the water environment.
Collapse
Affiliation(s)
- Jian Shen
- Research Center of Environmental Technology in Water Pollution Source Identification and Precise Supervision, School of Environment, Tsinghua University, Beijing, 100084, China; Research and Development Center of Advanced Environmental Supervision Technology and Instrument, Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215163, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Yiming Song
- Research Center of Environmental Technology in Water Pollution Source Identification and Precise Supervision, School of Environment, Tsinghua University, Beijing, 100084, China; Research and Development Center of Advanced Environmental Supervision Technology and Instrument, Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215163, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Cheng Cheng
- Research Center of Environmental Technology in Water Pollution Source Identification and Precise Supervision, School of Environment, Tsinghua University, Beijing, 100084, China; Research and Development Center of Advanced Environmental Supervision Technology and Instrument, Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215163, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Fengkui Duan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Chuanyang Liu
- Research Center of Environmental Technology in Water Pollution Source Identification and Precise Supervision, School of Environment, Tsinghua University, Beijing, 100084, China; Research and Development Center of Advanced Environmental Supervision Technology and Instrument, Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215163, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Yidi Chai
- Research Center of Environmental Technology in Water Pollution Source Identification and Precise Supervision, School of Environment, Tsinghua University, Beijing, 100084, China; Research and Development Center of Advanced Environmental Supervision Technology and Instrument, Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215163, China
| | - Siting Wang
- Research and Development Center of Advanced Environmental Supervision Technology and Instrument, Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215163, China
| | - Qiuran Xiong
- Research Center of Environmental Technology in Water Pollution Source Identification and Precise Supervision, School of Environment, Tsinghua University, Beijing, 100084, China; Research and Development Center of Advanced Environmental Supervision Technology and Instrument, Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215163, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Jing Wu
- Research Center of Environmental Technology in Water Pollution Source Identification and Precise Supervision, School of Environment, Tsinghua University, Beijing, 100084, China; Research and Development Center of Advanced Environmental Supervision Technology and Instrument, Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215163, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
| |
Collapse
|
10
|
Begum MS, Park JH, Yang L, Shin KH, Hur J. Optical and molecular indices of dissolved organic matter for estimating biodegradability and resulting carbon dioxide production in inland waters: A review. WATER RESEARCH 2023; 228:119362. [PMID: 36427460 DOI: 10.1016/j.watres.2022.119362] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 10/20/2022] [Accepted: 11/12/2022] [Indexed: 06/16/2023]
Abstract
Biodegradable dissolved organic carbon (BDOC) constitutes the most labile fraction of dissolved organic matter (DOM), which also functions as a source of CO2 emissions from inland waters. However, no systematic review is available on DOM indicators of BDOC and CO2 production potential. Optical and molecular indices can be used to track small changes in DOM composition during biodegradation. In this review, we identified four different methods for measuring BDOC together with their strengths and limitations. In addition, we discuss the potential of using documented optical indices based on absorption and fluorescence spectroscopy and molecular indices based on Fourier transform ion cyclotron mass spectrometry as proxies for estimating BDOC and biodegradation-induced CO2 production based on previously reported relationships in the literature. Many absorbance- and fluorescence-based indices showed inconsistent relationships with BDOC depending on watershed characteristics, hydrology, and anthropogenic impacts. Nevertheless, several indices, including specific UV absorbance at 254 nm (SUVA254), humification index (HIX), and terrestrial humic-like fluorescent DOM (FDOM) components, tended to have negative relationships with BDOC in tropical and temperate watersheds under baseflow or drought periods. Protein-like FDOM exhibited the strongest correlation with BDOC in different systems, except during storms and flood events. Despite the limited number of studies, DOM molecular indices exhibited consistent relationships with BDOC, suggesting that the relative abundance of aliphatic formulas and the molecular lability index could act as reliable proxies. The DOM optical indices explain up to 96% and 78% variability in BDOC and CO2, respectively; nonetheless, there were limited studies on molecular indices, which explain up to 74% variability in BDOC. Based on literature survey, we recommend several sensitive indices such as SUVA254, HIX, and terrestrial humic- and protein-like FDOM, which could be useful indicators of BDOC and dissolved CO2 in inland water. Future research should incorporate a wider range of geographic regions with various land use, hydrology, and anthropogenic disturbances to develop system- or condition-specific DOM optical or molecular proxies for better prediction of BDOC and CO2 emissions.
Collapse
Affiliation(s)
- Most Shirina Begum
- Department of Environment and Energy, Sejong University, Seoul 05006, South Korea
| | - Ji-Hyung Park
- Department of Environmental Science and Engineering, Ewha Womans University, Seoul 03760, South Korea
| | - Liyang Yang
- College of Environment and Safety Engineering, Fuzhou University, Fuzhou, Fujian, China
| | - Kyung Hoon Shin
- Department of Marine Science and Convergence Engineering, Hanyang University, Ansan, Gyeonggi do 15588, South Korea
| | - Jin Hur
- Department of Environment and Energy, Sejong University, Seoul 05006, South Korea.
| |
Collapse
|
11
|
Ye Y, Cai X, Wang Z, Xie X. Characterization of dissolved black carbon and its binding behaviors to ceftazidime and diclofenac pharmaceuticals: Employing the molecular weight fractionation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 315:120449. [PMID: 36265731 DOI: 10.1016/j.envpol.2022.120449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 09/24/2022] [Accepted: 10/14/2022] [Indexed: 06/16/2023]
Abstract
As the ubiquitous component of the aquatic environment, dissolved organic matter (DOM) readily bind with residual pharmaceutical contaminants (PCs) and influence their environmental behaviors. However, the binding mechanisms between dissolved black carbon (DBC), a vital part of the natural DOM pool, and PCs were poorly researched. In this study, the bulk DBC was divided into four fractions in molecular weight (MW) via an ultrafiltration system, and the properties of DBC and their binding interaction with two kinds of typical PCs (ceftazidime (CAZ) and diclofenac (DCF)) were explored concretely. The results showed that low MW component was the main contributor to bulk DBC, and the aromaticity increased with the increase of MW. The categories of chemical structures and fluorescent substances in different MW DBC were similar. Multispectral techniques showed that the oxygen-enriched compounds in DBC had the higher affinity to CAZ/DCF. The -NH-, -COOH, -NH2 groups in CAZ molecules appeared to form the hydrogen bond with DBC. Fluorescence quenching experiments were analyzed, and the binding mechanisms were specifically expounded from the thermodynamic perspective. The fluorophore of fulvic acid-like compounds (FA) were quenched by both static and dynamic quenching mechanisms, while only static quenching occurred for humic acid-like compounds (HA). For bulk DBC, the hydrogen bond and van der Waals force were the major forces in the HA-CAZ system, while the hydrophobic force made the primary contribution to the HA-DCF system, which might be ascribed to the higher hydrophobic nature of DCF. Notably, with the increase of HA MW, the main binding mode of HA-CAZ/DCF changed from hydrophobic force to hydrogen bond and van der Waals force gradually, which also directly proved that various noncovalent interactions co-driven the binding processes. Our findings are beneficial to better assess the fate of DBC and PCs and the corresponding complexes in the aquatic environment.
Collapse
Affiliation(s)
- Yuping Ye
- College of Earth and Environmental Sciences, Lanzhou University, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, Lanzhou, 730000, China
| | - Xuewei Cai
- College of Earth and Environmental Sciences, Lanzhou University, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, Lanzhou, 730000, China
| | - Zhaowei Wang
- College of Earth and Environmental Sciences, Lanzhou University, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, Lanzhou, 730000, China.
| | - Xiaoyun Xie
- College of Earth and Environmental Sciences, Lanzhou University, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, Lanzhou, 730000, China
| |
Collapse
|
12
|
Sheridan EA, Fonvielle JA, Cottingham S, Zhang Y, Dittmar T, Aldridge DC, Tanentzap AJ. Plastic pollution fosters more microbial growth in lakes than natural organic matter. Nat Commun 2022; 13:4175. [PMID: 35882837 PMCID: PMC9325981 DOI: 10.1038/s41467-022-31691-9] [Citation(s) in RCA: 49] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 06/29/2022] [Indexed: 01/04/2023] Open
Abstract
Plastic debris widely pollutes freshwaters. Abiotic and biotic degradation of plastics releases carbon-based substrates that are available for heterotrophic growth, but little is known about how these novel organic compounds influence microbial metabolism. Here we found leachate from plastic shopping bags was chemically distinct and more bioavailable than natural organic matter from 29 Scandinavian lakes. Consequently, plastic leachate increased bacterial biomass acquisition by 2.29-times when added at an environmentally-relevant concentration to lake surface waters. These results were not solely attributable to the amount of dissolved organic carbon provided by the leachate. Bacterial growth was 1.72-times more efficient with plastic leachate because the added carbon was more accessible than natural organic matter. These effects varied with both the availability of alternate, especially labile, carbon sources and bacterial diversity. Together, our results suggest that plastic pollution may stimulate aquatic food webs and highlight where pollution mitigation strategies could be most effective. Ultra-high resolution mass spectrometry revealed that plastic bags leach labile compounds. Bioassays performed in Scandinavian lakes indicated that these compounds are incorporated into biomass faster and more efficiently than natural organic matter.
Collapse
Affiliation(s)
- Eleanor A Sheridan
- Ecosystems and Global Change Group, Department of Plant Sciences, University of Cambridge, Cambridge, CB2 3EA, United Kingdom. .,Department of Zoology, University of Cambridge, The David Attenborough Building, Cambridge, CB2 3QZ, United Kingdom.
| | - Jérémy A Fonvielle
- Ecosystems and Global Change Group, Department of Plant Sciences, University of Cambridge, Cambridge, CB2 3EA, United Kingdom
| | - Samuel Cottingham
- Ecosystems and Global Change Group, Department of Plant Sciences, University of Cambridge, Cambridge, CB2 3EA, United Kingdom
| | - Yi Zhang
- Ecosystems and Global Change Group, Department of Plant Sciences, University of Cambridge, Cambridge, CB2 3EA, United Kingdom
| | - Thorsten Dittmar
- Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, 26129, Oldenburg, Germany.,Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg (HIFMB), 26129, Oldenburg, Germany
| | - David C Aldridge
- Department of Zoology, University of Cambridge, The David Attenborough Building, Cambridge, CB2 3QZ, United Kingdom
| | - Andrew J Tanentzap
- Ecosystems and Global Change Group, Department of Plant Sciences, University of Cambridge, Cambridge, CB2 3EA, United Kingdom.
| |
Collapse
|
13
|
Philibert M, Luo S, Moussanas L, Yuan Q, Filloux E, Zraick F, Murphy KR. Drinking water aromaticity and treatability is predicted by dissolved organic matter fluorescence. WATER RESEARCH 2022; 220:118592. [PMID: 35613481 DOI: 10.1016/j.watres.2022.118592] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 04/19/2022] [Accepted: 05/10/2022] [Indexed: 06/15/2023]
Abstract
Samples from fifty-five surface water resources and twenty-five drinking water treatment plants in Europe, Africa, Asia, and USA were used to analyse the fluorescence composition of global surface waters and predict aromaticity and treatability from fluorescence excitation emission matrices. Nine underlying fluorescence components were identified in the dataset using parallel factor analysis (PARAFAC) and differences in aromaticity and treatability could be predicted from ratios between components Hii (λex/λem= 395/521), Hiii (λex/λem= 330/404), Pi, (λex/λem=290/365) and Pii (λex/λem= 275/302). Component Hii tracked humic acids of primarily plant origin, Hiii tracked weathered/oxidised humics and the "building block" fraction measured by LC-OCD, while Pi and Pii tracked amino acids in the "low molecular weight neutrals" LC-OCD fraction. Ratios between PARAFAC components predicted DOC removal at lab scale for French rivers in standardized tests involving coagulation, powdered activated carbon (PAC), chlorination, ion exchange (IEX), and ozonation, alone and in combination. The ratio Hii/Hiii, for convenience named "PARIX" standing for "PARAFAC index", predicted SUVA according to a simple relationship: SUVA = 4.0 x PARIX (RMSEp=0.55) Lmg-1m-1. These results expand the utility of fluorescence spectroscopy in water treatment applications, by demonstrating the existence of previously unknown relationships between fluorescence composition, aromaticity and treatability that appear to hold across diverse surface waters at various stages of drinking water treatment.
Collapse
Affiliation(s)
- Marc Philibert
- SUEZ - CIRSEE, 38, rue du Président-Wilson, 78230, Le Pecq, France
| | - Simin Luo
- SUEZ - CIRSEE, 38, rue du Président-Wilson, 78230, Le Pecq, France
| | - Lavel Moussanas
- SUEZ - CIRSEE, 38, rue du Président-Wilson, 78230, Le Pecq, France
| | - Qingqing Yuan
- SUEZ - CIRSEE, 38, rue du Président-Wilson, 78230, Le Pecq, France
| | | | - Flavia Zraick
- SUEZ - CIRSEE, 38, rue du Président-Wilson, 78230, Le Pecq, France
| | - Kathleen R Murphy
- Chalmers University of Technology, Department of Architecture and Civil Engineering, SE-412 96, Gothenburg, Sweden.
| |
Collapse
|
14
|
De Stefano LG, Valdivia AS, Gianello D, Gerea M, Reissig M, García PE, García RD, Cárdenas CS, Diéguez MC, Queimaliños CP, Pérez GL. Using CDOM spectral shape information to improve the estimation of DOC concentration in inland waters: A case study of Andean Patagonian Lakes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 824:153752. [PMID: 35176388 DOI: 10.1016/j.scitotenv.2022.153752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Revised: 02/04/2022] [Accepted: 02/04/2022] [Indexed: 06/14/2023]
Abstract
For the last two decades different scientific disciplines have focused on lacustrine dissolved organic matter (DOM) given its importance in the biogeochemistry of carbon and in ecosystem functioning. New satellites supply the appropriate resolutions to evaluate chromophoric dissolved organic matter (CDOM) in inland waters, opening the possibility to estimate DOM at appropriate spatiotemporal scales. This requires, however, a robust relationship between CDOM and dissolved organic carbon (DOC). In this work, we evaluated the use of CDOM as a proxy of DOC in 7 Andean Patagonian lakes. Considering the entire data set, CDOM absorption coefficients (a355 and a440) were linearly related with DOC. Shallow lakes, however, drove this relationship showing a moderate relationship, whereas, deep lakes with lower colour presented a weaker relationship. Therefore, we assessed the use of CDOM spectral shape information to improve DOC estimates regardless of observed DOM differences due to climatic seasonality and lakes' morphometry. The use of well-known CDOM spectral shape metrics (i.e., S275-295 and a250:a365 ratio) significantly improved DOC estimation. Particularly, using a Gaussian decomposition approach we found that much of the variation in the spectral shape, associated with the variability of CDOM:DOC ratio, was explained by differences in two dynamic regions centred at 270 and 320 nm. A strong nonlinear relationship was found between the a270:a320 ratio and the DOC-specific absorption coefficients a*355 and a*440. This was translated into a further improvement in DOC estimation yielding the higher R2 and lower mean absolute differences (MAPD < 16%), either considering the entire data set or shallow and deep lakes separately. Our results highlight that incorporating the CDOM spectral shape information improves the characterization of the DOC pool of inland waters, which is particularly relevant for remote and/or inaccessible sites and has significant implications for the environmental management, biogeochemical studies and future remote sensing applications.
Collapse
Affiliation(s)
- L G De Stefano
- Grupo de Ecología de Sistemas Acuáticos a escala de Paisaje (GESAP), INIBIOMA, Universidad Nacional del Comahue, CONICET, Quintral 1250, CP8400 San Carlos de Bariloche, Argentina
| | - A Sánchez Valdivia
- Grupo de Ecología de Sistemas Acuáticos a escala de Paisaje (GESAP), INIBIOMA, Universidad Nacional del Comahue, CONICET, Quintral 1250, CP8400 San Carlos de Bariloche, Argentina
| | - D Gianello
- Grupo de Ecología de Sistemas Acuáticos a escala de Paisaje (GESAP), INIBIOMA, Universidad Nacional del Comahue, CONICET, Quintral 1250, CP8400 San Carlos de Bariloche, Argentina
| | - M Gerea
- Grupo de Ecología de Sistemas Acuáticos a escala de Paisaje (GESAP), INIBIOMA, Universidad Nacional del Comahue, CONICET, Quintral 1250, CP8400 San Carlos de Bariloche, Argentina
| | - M Reissig
- Grupo de Ecología de Sistemas Acuáticos a escala de Paisaje (GESAP), INIBIOMA, Universidad Nacional del Comahue, CONICET, Quintral 1250, CP8400 San Carlos de Bariloche, Argentina
| | - P E García
- Grupo de Ecología de Sistemas Acuáticos a escala de Paisaje (GESAP), INIBIOMA, Universidad Nacional del Comahue, CONICET, Quintral 1250, CP8400 San Carlos de Bariloche, Argentina
| | - R D García
- Grupo de Ecología de Sistemas Acuáticos a escala de Paisaje (GESAP), INIBIOMA, Universidad Nacional del Comahue, CONICET, Quintral 1250, CP8400 San Carlos de Bariloche, Argentina
| | - C Soto Cárdenas
- Grupo de Ecología de Sistemas Acuáticos a escala de Paisaje (GESAP), INIBIOMA, Universidad Nacional del Comahue, CONICET, Quintral 1250, CP8400 San Carlos de Bariloche, Argentina
| | - M C Diéguez
- Grupo de Ecología de Sistemas Acuáticos a escala de Paisaje (GESAP), INIBIOMA, Universidad Nacional del Comahue, CONICET, Quintral 1250, CP8400 San Carlos de Bariloche, Argentina
| | - C P Queimaliños
- Grupo de Ecología de Sistemas Acuáticos a escala de Paisaje (GESAP), INIBIOMA, Universidad Nacional del Comahue, CONICET, Quintral 1250, CP8400 San Carlos de Bariloche, Argentina
| | - G L Pérez
- Grupo de Ecología de Sistemas Acuáticos a escala de Paisaje (GESAP), INIBIOMA, Universidad Nacional del Comahue, CONICET, Quintral 1250, CP8400 San Carlos de Bariloche, Argentina.
| |
Collapse
|
15
|
Berggren M, Guillemette F, Bieroza M, Buffam I, Deininger A, Hawkes JA, Kothawala DN, LaBrie R, Lapierre JF, Murphy KR, Al-Kharusi ES, Rulli MPD, Hensgens G, Younes H, Wünsch UJ. Unified understanding of intrinsic and extrinsic controls of dissolved organic carbon reactivity in aquatic ecosystems. Ecology 2022; 103:e3763. [PMID: 35612376 PMCID: PMC9540823 DOI: 10.1002/ecy.3763] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 04/18/2022] [Indexed: 11/15/2022]
Abstract
Despite our growing understanding of the global carbon cycle, scientific consensus on the drivers and mechanisms that control dissolved organic carbon (DOC) turnover in aquatic systems is lacking, hampered by the mismatch between research that approaches DOC reactivity from either intrinsic (inherent chemical properties) or extrinsic (environmental context) perspectives. Here we propose a conceptual view of DOC reactivity in which the combination of intrinsic and extrinsic factors controls turnover rates and determines which reactions will occur. We review three major types of reactions (biological, photochemical, and flocculation) from an intrinsic chemical perspective and further define the environmental features that modulate the expression of chemically inherent reactivity potential. Finally, we propose hypotheses of how extrinsic and intrinsic factors together shape patterns in DOC turnover across the land‐to‐ocean continuum, underscoring that there is no intrinsic DOC reactivity without environmental context. By acknowledging the intrinsic–extrinsic control duality, our framework intends to foster improved modeling of DOC reactivity and its impact on ecosystem services.
Collapse
Affiliation(s)
- Martin Berggren
- Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden
| | - François Guillemette
- Département des sciences de l'environnement, Université du Québec à Trois-Rivières, Canada.,Groupe de recherche interuniversitaire en limnologie (GRIL), Montréal, Canada
| | - Magdalena Bieroza
- Department of Soil and Environment, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Ishi Buffam
- Department of Landscape Architecture, Planning and Management, Swedish University of Agricultural Sciences, Alnarp, Sweden
| | - Anne Deininger
- Norwegian Institute for Water Research (NIVA), Oslo, Norway.,Centre for Coastal Research (CCR), University of Agder, Kristiansand, Norway
| | - Jeffrey A Hawkes
- Department of Chemistry, BMC, Uppsala University, Uppsala, Sweden
| | - Dolly N Kothawala
- Department of Ecology and Genetics, Uppsala University, Uppsala, Sweden
| | - Richard LaBrie
- Groupe de recherche interuniversitaire en limnologie (GRIL), Montréal, Canada.,Département des Sciences biologiques, Université de Montréal, Montréal, Canada
| | - Jean-François Lapierre
- Groupe de recherche interuniversitaire en limnologie (GRIL), Montréal, Canada.,Département des Sciences biologiques, Université de Montréal, Montréal, Canada
| | - Kathleen R Murphy
- Department of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - Enass S Al-Kharusi
- Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden
| | - Mayra P D Rulli
- Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden
| | - Geert Hensgens
- Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden
| | - Hani Younes
- Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden
| | - Urban J Wünsch
- Department of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg, Sweden
| |
Collapse
|
16
|
Characteristics of Chromophoric Dissolved Organic Matter (CDOM) Produced by Heterotrophic Bacteria Isolated from Aquaculture Systems. JOURNAL OF MARINE SCIENCE AND ENGINEERING 2022. [DOI: 10.3390/jmse10050672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Heterotrophic bacteria (HB) play an important role in aquatic ecosystems as recyclers of dissolved organic matter (DOM). The objective of this study was to characterize the spectral characteristics of intracellular (IC), and extracellular (EC) compounds produced by 12 HB isolated from two aquaculture systems. Microorganisms belonging to the genera Bacillus, Paenibacillus, and Psychrobacillus were identified by analysis of the 16S ribosomal gene. Aliquots of bacterial culture were centrifugated every hour (1st to 7th) to obtain the EC compounds. The pellet was ultrasound-lysed to obtain the IC compounds. Excitation-emission matrices were used in combination with parallel factor analysis (PARAFAC) to characterize the fluorescent components of DOM (FDOM). PARAFAC indicated two protein-like components and two humic-like components in both cell spaces. At the IC, B. macquariensis showed a high fluorescence index (FI), probably associated with fulvic acid, quinones, or ketones. Psychrobacillus insolitus showed an inverse correlation between spectral slopes S275–295 and S350–400 in the EC and IC fractions, which may indicate differential release of low and high molecular weight molecules in these two fractions. The opposite occurred with B. licheniformis and P. alvei. The origin of FDOM in HB is an important finding of this work. The most significant amount of protein-like substances was produced at the IC level, with the humic- and fulvic-type at the EC. The main finding of this work is the evidence of differential production of humic-type or protein-type FDOM production by HB species from marine and freshwater aquaculture systems in their intracellular and extracellular fractions, as well different relative molecular weight. For aquaculture, these findings suggest that some bacterial species show promise in supplying essential amino acids to growing organisms, and others play a major role in nutrient exchange and the global carbon cycle.
Collapse
|
17
|
Sanwlani N, Evans CD, Müller M, Cherukuru N, Martin P. Rising dissolved organic carbon concentrations in coastal waters of northwestern Borneo related to tropical peatland conversion. SCIENCE ADVANCES 2022; 8:eabi5688. [PMID: 35417233 PMCID: PMC9007511 DOI: 10.1126/sciadv.abi5688] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 02/24/2022] [Indexed: 05/19/2023]
Abstract
Southeast Asia's peatlands are considered a globally important source of terrigenous dissolved organic carbon (DOC) to the ocean. Human disturbance has probably increased peatland DOC fluxes, but the lack of monitoring has precluded a robust demonstration of such a regional-scale impact. Here, we use a time series of satellite ocean color data from northwestern Borneo to show that DOC concentrations in coastal waters have increased between 2002 and 2021 by 0.31 μmol liter-1 year-1 (95% confidence interval, 0.18 to 0.44 μmol liter-1 year-1). We show that this was caused by a ≥30% increase in the concentration of terrigenous DOC and coincided with the conversion of 69% of regional peatland area to nonforest land cover, suggesting that peatland conversion has substantially increased DOC fluxes to the sea. This rise in DOC concentration has also increased the underwater light absorption by dissolved organic matter, which may affect marine productivity by altering underwater light availability.
Collapse
Affiliation(s)
- Nivedita Sanwlani
- Asian School of the Environment, Nanyang Technological University, Singapore, Singapore
- Corresponding author. (P.M.); (N.S.)
| | - Chris D. Evans
- UK Centre for Ecology & Hydrology, Bangor LL57 2UW, UK
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden
- Department of Geography, Environmental Management and Energy Studies, University of Johannesburg, Johannesburg, South Africa
| | - Moritz Müller
- Swinburne University of Technology Sarawak Campus, Kuching, Malaysia
| | | | - Patrick Martin
- Asian School of the Environment, Nanyang Technological University, Singapore, Singapore
- Corresponding author. (P.M.); (N.S.)
| |
Collapse
|
18
|
Coble AA, Wymore AS, Potter JD, McDowell WH. Land Use Overrides Stream Order and Season in Driving Dissolved Organic Matter Dynamics Throughout the Year in a River Network. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:2009-2020. [PMID: 35007420 DOI: 10.1021/acs.est.1c06305] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Anthropogenic land use has increased nutrient concentrations and altered dissolved organic matter (DOM) character and its bioavailability. Despite widespread recognition that DOM character and its reactivity can vary temporally, the relative influence of land use and stream order on DOM characteristics is poorly understood across seasons and the entire flow regime. We examined DOM character and 28-day bioavailable dissolved organic carbon (BDOC) across a river network to determine the relative roles of land use and stream order in driving variability in DOM character and bioavailability throughout the year. DOM in 1st-order streams was distinct from higher stream orders with lower DOC concentrations, less aromatic (specific ultraviolet absorbance at 254 nm (SUVA254)), more autochthonous (fluorescence index), and more recently produced (β/α) DOM. Across all months, variability in DOM character was primarily explained by land use, rather than stream order or season. Land use and stream order explained the most DOM variation in transitional and winter months and the least during dry months. BDOC was greater in watersheds with less aromatic (SUVA254) and more recent allochthonous DOM (β/α) and more development and impervious surface. With continued development, the bioavailability of DOM in the smallest and most impacted watersheds is expected to increase.
Collapse
Affiliation(s)
- Ashley A Coble
- Department of Natural Resources and the Environment, University of New Hampshire, Durham, New Hampshire 03824, United States
| | - Adam S Wymore
- Department of Natural Resources and the Environment, University of New Hampshire, Durham, New Hampshire 03824, United States
| | - Jody D Potter
- Department of Natural Resources and the Environment, University of New Hampshire, Durham, New Hampshire 03824, United States
| | - William H McDowell
- Department of Natural Resources and the Environment, University of New Hampshire, Durham, New Hampshire 03824, United States
| |
Collapse
|
19
|
Hu B, Wang P, Wang C, Bao T. Photogeochemistry of particulate organic matter in aquatic systems: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150467. [PMID: 34592285 DOI: 10.1016/j.scitotenv.2021.150467] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 09/15/2021] [Accepted: 09/16/2021] [Indexed: 06/13/2023]
Abstract
Photochemical transformation of natural organic matter in aquatic environments strongly impacts the environmental behaviors of carbon, nutrients, and pollutants by affecting their solubility, toxicity, bioavailability, and mobility. However, the role of particulate organic matter (POM) in environmental photogeochemistry has received much less attention than that of dissolved organic matter (DOM). In this study, a systematic overview was conducted to summarize the photodissolution and photoflocculation of POM in aquatic systems. The photodissolution of various POM, such as resuspended sediments and algal detritus, could be a potential and important source of DOM in the overlying waters, and these photoreleased DOM were dominated by humic-like components. The photogeochemistry of POM is thought to proceed via direct photochemical reactions and reactive radical-dominated indirect processes. Photodissolution can modify the bioavailability of organic matter and influence the biogeochemical cycling of nutrients, heavy metals, and organic pollutants. In addition, the photo-induced flocculation of DOM to POM could also influence the transport and transformation of organic matter and its associated pollutants. The photochemistry of POM can be significantly influenced by several environmental factors, including irradiation wavelength and intensity, organic matter properties, and radical oxygen species. POM photogeochemistry is one of the most important components of the global cycling of natural organic matter. Further studies regarding photogeochemistry should be conducted to overcome the potential problems arising from the concurrent photodegradation of organic matter and to further develop more filed investigations and analytical methods.
Collapse
Affiliation(s)
- Bin Hu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China
| | - Peifang Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
| | - Chao Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China
| | - Tianli Bao
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China
| |
Collapse
|
20
|
Curra-Sánchez ED, Lara C, Cornejo-D'Ottone M, Nimptsch J, Aguayo M, Broitman BR, Saldías GS, Vargas CA. Contrasting land-uses in two small river basins impact the colored dissolved organic matter concentration and carbonate system along a river-coastal ocean continuum. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150435. [PMID: 34583070 DOI: 10.1016/j.scitotenv.2021.150435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 09/14/2021] [Accepted: 09/15/2021] [Indexed: 06/13/2023]
Abstract
Human activities have led to an increase in land use change, with effects on the structure and functioning of ecosystems. The impact of contrasting land uses along river basins on the concentration of colored dissolved organic matter (CDOM) reaching the coastal zone, and its relationship with the carbonate system of the adjacent coastal ocean, is poorly known. To understand the relationship between land use change, CDOM and its influence on the carbonate system, two watersheds with contrasting land uses in southern Chile were studied. The samples were collected at eight stations between river and adjacent coastal areas, during three sampling campaigns in the austral summer and spring. Chemical and biological samples were analyzed in the laboratory according to standard protocols. Landsat 8 satellite images of the study area were used for identification and supervised classification using remote sensing tools. The Yaldad River basin showed 82% of native forest and the Colu River basin around 38% of grassland (agriculture). Low total alkalinity (AT) and Dissolved Inorganic Carbon (DIC), but high CDOM proportions were typically observed in freshwater. A higher CDOM and humic-like compounds concentration was observed along the river-coastal ocean continuum in the Yaldad basin, characterized by a predominance of native forests. In contrast, nutrient concentrations, AT and DIC, were higher in the Colu area. Low CaCO3 saturation state (ΩAr < 2) and even undersaturation conditions were observed at the coastal ocean at Yaldad. A strong negative correlation between AT, DIC and ΩAr with CDOM/fDOM, suggested the influence of terrestrial material on the seawater carbon chemistry. Our results provide robust evidence that land uses in river basins can influence CDOM/fDOM proportion and its influence on the carbonate chemistry of the adjacent coastal, with potential implications for the shellfish farming activity in this region.
Collapse
Affiliation(s)
- Elizabeth D Curra-Sánchez
- Programa de Doctorado en Ciencias Ambientales, Departamento de Sistemas Acuáticos, Facultad de Ciencias Ambientales, Universidad de Concepción, Concepción, Chile; Laboratorio de Ecosistemas Costeros y Cambio Ambiental Global (ECCALab), Departamento de Sistemas Acuáticos, Facultad de Ciencias Ambientales y Centro de Ciencias Ambientales EULA Chile, Universidad de Concepción, Concepción, Chile; Instituto Milenio en Socio-Ecología Costera (SECOS), P. Universidad Católica de Chile, Santiago, Chile
| | - Carlos Lara
- Departamento de Ecología, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Concepción, Chile; Centro de Investigación en Recursos Naturales y Sustentabilidad, Universidad Bernardo O'Higgins, Santiago, Chile
| | | | - Jorge Nimptsch
- Instituto de Ciencias Marinas y Limnológicas, Laboratorio de Bioensayos y Limnología Aplicada, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
| | - Mauricio Aguayo
- Departamento de Planificación Territorial, Facultad de Ciencias Ambientales y Centro de Ciencias Ambientales EULA Chile, Universidad de Concepción, Concepción, Chile
| | - Bernardo R Broitman
- Instituto Milenio en Socio-Ecología Costera (SECOS), P. Universidad Católica de Chile, Santiago, Chile; Departamento de Ciencias, Facultad de Artes Liberales, Universidad Adolfo Ibáñez, Viña del Mar, Chile
| | - Gonzalo S Saldías
- Instituto Milenio en Socio-Ecología Costera (SECOS), P. Universidad Católica de Chile, Santiago, Chile; Departamento de Física, Facultad de Ciencias, Universidad del Bío-Bío, Concepción, Chile
| | - Cristian A Vargas
- Laboratorio de Ecosistemas Costeros y Cambio Ambiental Global (ECCALab), Departamento de Sistemas Acuáticos, Facultad de Ciencias Ambientales y Centro de Ciencias Ambientales EULA Chile, Universidad de Concepción, Concepción, Chile; Instituto Milenio en Socio-Ecología Costera (SECOS), P. Universidad Católica de Chile, Santiago, Chile.
| |
Collapse
|
21
|
Ma K, Powers LC, Seppälä J, Norkko J, Brandes JA. Effects of Added Humic Substances and Nutrients on Photochemical Degradation of Dissolved Organic Matter in A Mesocosm Amendment Experiment in the Gulf of Finland, Baltic Sea. Photochem Photobiol 2022; 98:1025-1042. [PMID: 35088423 DOI: 10.1111/php.13597] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Accepted: 01/21/2022] [Indexed: 11/28/2022]
Abstract
Humic substances, a component of terrestrial dissolved organic matter (tDOM), contribute to dissolved organic matter (DOM) and chromophoric DOM (CDOM) in coastal waters, and have significant impacts on biogeochemistry. There are concerns in recent years over browning effects in surface waters, due to increasing tDOM inputs, and their negative impacts on aquatic ecosystems, but relatively little work has been published on estuaries and coastal waters. Photodegradation could be a significant sink for tDOM in coastal environments, but the rates and efficiencies are poorly constrained. We conducted large-scale DOM photodegradation experiments in mesocosms amended with humic substances and nutrients in the Gulf of Finland to investigate the potential of photochemistry to remove added tDOM and the interactions of DOM photochemistry with eutrophication. The added tDOM was photodegraded rapidly, as CDOM absorption decreased and spectral slopes increased with increasing photons absorbed in laboratory experiments. The in situ DOM optical properties became similar amongst the control, humic-, and humic+nutrients-amended mesocosm samples towards the end of the amendment experiment, indicating degradation of the excess CDOM/DOM through processes including photodegradation. Nutrient additions didn't significantly influence the effects of added humic substances on CDOM optical property changes, but induced changes in DOM removal.
Collapse
Affiliation(s)
- Kun Ma
- Skidaway Institute of Oceanography, Department of Marine Sciences, University of Georgia, Savannah, GA, USA
| | - Leanne C Powers
- Skidaway Institute of Oceanography, Department of Marine Sciences, University of Georgia, Savannah, GA, USA.,Department of Chemistry, State University of New York, College of Environmental Science and Forestry, Syracuse, NY, USA
| | - Jukka Seppälä
- Finnish Environment Institute, Marine Research Centre, Helsinki, Finland
| | - Joanna Norkko
- Tvärminne Zoological Station, University of Helsinki, Hanko, Finland
| | - Jay A Brandes
- Skidaway Institute of Oceanography, Department of Marine Sciences, University of Georgia, Savannah, GA, USA
| |
Collapse
|
22
|
van Hoek WJ, Wang J, Vilmin L, Beusen AH, Mogollón JM, Müller G, Pika PA, Liu X, Langeveld JJ, Bouwman AF, Middelburg JJ. Exploring Spatially Explicit Changes in Carbon Budgets of Global River Basins during the 20th Century. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:16757-16769. [PMID: 34855371 PMCID: PMC8697559 DOI: 10.1021/acs.est.1c04605] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 10/15/2021] [Accepted: 11/11/2021] [Indexed: 06/01/2023]
Abstract
Rivers play an important role in the global carbon (C) cycle. However, it remains unknown how long-term river C fluxes change because of climate, land-use, and other environmental changes. Here, we investigated the spatiotemporal variations in global freshwater C cycling in the 20th century using the mechanistic IMAGE-Dynamic Global Nutrient Model extended with the Dynamic In-Stream Chemistry Carbon module (DISC-CARBON) that couples river basin hydrology, environmental conditions, and C delivery with C flows from headwaters to mouths. The results show heterogeneous spatial distribution of dissolved inorganic carbon (DIC) concentrations in global inland waters with the lowest concentrations in the tropics and highest concentrations in the Arctic and semiarid and arid regions. Dissolved organic carbon (DOC) concentrations are less than 10 mg C/L in most global inland waters and are generally high in high-latitude basins. Increasing global C inputs, burial, and CO2 emissions reported in the literature are confirmed by DISC-CARBON. Global river C export to oceans has been stable around 0.9 Pg yr-1. The long-term changes and spatial patterns of concentrations and fluxes of different C forms in the global river network unfold the combined influence of the lithology, climate, and hydrology of river basins, terrestrial and biological C sources, in-stream C transformations, and human interferences such as damming.
Collapse
Affiliation(s)
- Wim J. van Hoek
- Department
of Earth Sciences − Geochemistry, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The Netherlands
| | - Junjie Wang
- Department
of Earth Sciences − Geochemistry, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The Netherlands
| | - Lauriane Vilmin
- Department
of Earth Sciences − Geochemistry, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The Netherlands
- Deltares, P.O. Box 177, 2600 MH Delft, The Netherlands
| | - Arthur H.W. Beusen
- Department
of Earth Sciences − Geochemistry, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The Netherlands
- PBL
Netherlands Environmental Assessment Agency, P.O. Box 30314, 2500
GH The Hague The Netherlands
| | - José M. Mogollón
- Department
of Industrial Ecology, Leiden University, P.O. Box 9518, 2300 RA Leiden, The Netherlands
| | - Gerrit Müller
- Department
of Earth Sciences − Geochemistry, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The Netherlands
| | - Philip A. Pika
- Faculty
of Science, Earth and Climate, Free University
of Amsterdam, de Boelelaan 1105, 1081 HV Amsterdam, The Netherlands
| | - Xiaochen Liu
- Department
of Earth Sciences − Geochemistry, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The Netherlands
| | - Joep J. Langeveld
- Department
of Earth Sciences − Geochemistry, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The Netherlands
- PBL
Netherlands Environmental Assessment Agency, P.O. Box 30314, 2500
GH The Hague The Netherlands
| | - Alexander F. Bouwman
- Department
of Earth Sciences − Geochemistry, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The Netherlands
- PBL
Netherlands Environmental Assessment Agency, P.O. Box 30314, 2500
GH The Hague The Netherlands
- Key Laboratory
of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
| | - Jack J. Middelburg
- Department
of Earth Sciences − Geochemistry, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The Netherlands
| |
Collapse
|
23
|
Estlander S, Pippingsköld E, Horppila J. Artificial ditching of catchments and brownification-connected water quality parameters of lakes. WATER RESEARCH 2021; 205:117674. [PMID: 34597988 DOI: 10.1016/j.watres.2021.117674] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 08/25/2021] [Accepted: 09/15/2021] [Indexed: 06/13/2023]
Abstract
We studied the connections between lake water quality and the density of artificial ditching in lake catchments. Water color and the concentrations of dissolved organic carbon (DOC) and iron (Fe) in lake water increased with increasing ditch density. Additionally, the water color:DOC ratio increased along a ditch density gradient because ditching had a stronger effect on color than on DOC. This was mainly due to the positive effect of ditching on the Fe concentration in lakes. Color:DOC ratio was strongly dependent on Fe up to Fe concentrations of 1-1.5 mg L-1. Thus, the water color of lakes with Fe concentrations < 1 mg L-1 will respond especially strongly to the effects of catchment ditching. The effects of ditching were strongest in catchments with high peatland coverage due to their high ditch density and high storage of organic carbon and Fe. The long-lasting effects of ditching should be taken into account when studying the factors governing lake brownification.
Collapse
Affiliation(s)
- Satu Estlander
- Ecosystems and Environment Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, P.O. Box 65 (Viikinkaari 1), FI-00014, Finland
| | - Ella Pippingsköld
- Ecosystems and Environment Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, P.O. Box 65 (Viikinkaari 1), FI-00014, Finland
| | - Jukka Horppila
- Ecosystems and Environment Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, P.O. Box 65 (Viikinkaari 1), FI-00014, Finland.
| |
Collapse
|
24
|
Gold-Bouchot G, Polis S, Castañon LE, Flores MP, Alsante AN, Thornton DCO. Chromophoric dissolved organic matter (CDOM) in a subtropical estuary (Galveston Bay, USA) and the impact of Hurricane Harvey. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:53045-53057. [PMID: 34021894 DOI: 10.1007/s11356-021-14509-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Accepted: 05/17/2021] [Indexed: 06/12/2023]
Abstract
The landfall of Hurricane Harvey in August 2017 provided the opportunity to study the impact of extreme freshwater discharge on chromophoric dissolved organic matter (CDOM) properties in a subtropical estuary (Galveston Bay, Texas). Both fluorescence spectroscopy (excitation-emission matrices) and a three-component parallel factor analysis (PARAFAC) model identified changes in CDOM properties. Comparing to Coble's peaks, component 1 was similar to peak C, component 2 to peak M, and component 3 to peak B. Results clearly show three periods with distinct CDOM properties: a dry season, a wet season, and Hurricane Harvey. The dry season was characterized by higher values of the spectral slope and fluorescence and biological indices. The wet season was characterized by high values of PARAFAC components 1 and 2 (humic-like) and the absorption coefficient at 350 nm. Some CDOM components were highly correlated with salinity, indicating conservative mixing. Component 3 (protein-like) had a low correlation to salinity, suggesting degradation or production processes in the bay. Silicates and NO3- + NO2- had negative relationships with salinity and a positive one with PARAFAC components 1 and 2. PARAFAC component 3 was correlated with dissolved oxygen and chlorophyll a, suggesting a relationship between CDOM fluorescent components and phytoplankton activity. High values of the humification index were observed immediately after Hurricane Harvey, indicating increased input of terrestrial organic matter into the bay. Hurricane Harvey increased CDOM levels and humification, and the variability and changes seem to be mostly due to freshwater discharge from the San Jacinto River and not the Trinity River. The influx of freshwater was sufficient to eliminate the salinity gradient in Galveston Bay and significantly change CDOM properties. Galveston Bay recovered quickly from the hurricane and associated flux of freshwater, returning to pre-hurricane CDOM characteristics in less than 2 months.
Collapse
Affiliation(s)
- Gerardo Gold-Bouchot
- Geochemical and Environmental Research Group (GERG), College of Geosciences, Texas A&M University, 833 Graham Rd., TX, 77845, College Station, USA.
- Department of Oceanography, College of Geosciences, Texas A&M University, College Station, TX, USA.
| | - Samuel Polis
- Geochemical and Environmental Research Group (GERG), College of Geosciences, Texas A&M University, 833 Graham Rd., TX, 77845, College Station, USA
- Department of Oceanography, College of Geosciences, Texas A&M University, College Station, TX, USA
| | - Lauren Elizabeth Castañon
- Geochemical and Environmental Research Group (GERG), College of Geosciences, Texas A&M University, 833 Graham Rd., TX, 77845, College Station, USA
- Department of Oceanography, College of Geosciences, Texas A&M University, College Station, TX, USA
- California State University at Monterey Bay, Monterey County, CA, USA
| | - Mayra Padilla Flores
- Geochemical and Environmental Research Group (GERG), College of Geosciences, Texas A&M University, 833 Graham Rd., TX, 77845, College Station, USA
- Department of Oceanography, College of Geosciences, Texas A&M University, College Station, TX, USA
- California State University at Dominguez Hills, Carson, CA, USA
| | - Alyssa Nicole Alsante
- Department of Oceanography, College of Geosciences, Texas A&M University, College Station, TX, USA
| | | |
Collapse
|
25
|
Bastidas Navarro M, Schenone L, Martyniuk N, Vega E, Modenutti B, Balseiro E. Predicting Dissolved Organic Matter Lability and Carbon Accumulation in Temperate Freshwater Ecosystems. Ecosystems 2021. [DOI: 10.1007/s10021-021-00682-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
26
|
Liang Z, Liu Y, Xu Y, Wagner T. Bayesian change point quantile regression approach to enhance the understanding of shifting phytoplankton-dimethyl sulfide relationships in aquatic ecosystems. WATER RESEARCH 2021; 201:117287. [PMID: 34107366 DOI: 10.1016/j.watres.2021.117287] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 05/14/2021] [Accepted: 05/20/2021] [Indexed: 06/12/2023]
Abstract
Dimethyl sulfide (DMS) serves as an anti-greenhouse gas, plays multiple roles in aquatic ecosystems, and contributes to the global sulfur cycle. The chlorophyll a (CHL, an indicator of phytoplankton biomass)-DMS relationship is critical for estimating DMS emissions from aquatic ecosystems. Importantly, recent research has identified that the CHL-DMS relationship has a breakpoint, where the relationship is positive below a CHL threshold and negative at higher CHL concentrations. Conventionally, mean regression methods are employed to characterize the CHL-DMS relationship. However, these approaches focus on the response of mean conditions and cannot illustrate responses of other parts of the DMS distribution, which could be important in order to obtain a complete view of the CHL-DMS relationship. In this study, for the first time, we proposed a novel Bayesian change point quantile regression (BCPQR) model that integrates and inherits advantages of Bayesian change point models and Bayesian quantile regression models. Our objective was to examine whether or not the BCPQR approach could enhance the understanding of shifting CHL-DMS relationships in aquatic ecosystems. We fitted BCPQR models at five regression quantiles for freshwater lakes and for seas. We found that BCPQR models could provide a relatively complete view on the CHL-DMS relationship. In particular, it quantified the upper boundary of the relationship, representing the limiting effect of CHL on DMS. Based on the results of paired parameter comparisons, we revealed the inequality of regression slopes in BCPQR models for seas, indicating that applying the mean regression method to develop the CHL-DMS relationship in seas might not be appropriate. We also confirmed relationship differences between lakes and seas at multiple regression quantiles. Further, by introducing the concept of DMS emission potential, we found that pH was not likely a key factor leading to the change of the CHL-DMS relationship in lakes. These findings cannot be revealed using piecewise linear regression. We thereby concluded that the BCPQR model does indeed enhance the understanding of shifting CHL-DMS relationships in aquatic ecosystems and is expected to benefit efforts aimed at estimating DMS emissions. Considering that shifting (threshold) relationships are not rare and that the BCPQR model can easily be adapted to different systems, the BCPQR approach is expected to have great potential for generalization in other environmental and ecological studies.
Collapse
Affiliation(s)
- Zhongyao Liang
- Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, Fujian, China; Pennsylvania Cooperative Fish and Wildlife Research Unit, 407 Forest Resources Building, Pennsylvania State University, University Park, Pennsylvania 16802, USA.
| | - Yong Liu
- College of Environmental Sciences and Engineering, State Environmental Protection Key Laboratory of All Materials Flux in Rivers, Peking University, Beijing 100871, China.
| | - Yaoyang Xu
- Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, Fujian, China.
| | - Tyler Wagner
- U.S. Geological Survey, Pennsylvania Cooperative Fish and Wildlife Research Unit, Pennsylvania State University, 402 Forest Resources Building, University Park, Pennsylvania 16802, USA.
| |
Collapse
|
27
|
Kida M, Fujitake N, Kojima T, Tanabe Y, Hayashi K, Kudoh S, Dittmar T. Dissolved Organic Matter Processing in Pristine Antarctic Streams. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:10175-10185. [PMID: 34240854 DOI: 10.1021/acs.est.1c03163] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Accelerated glacier melt and runoff may lead to inputs of labile dissolved organic matter (DOM) to downstream ecosystems and stimulate the associated biogeochemical processes. However, still little is known about glacial DOM composition and its downstream processing before entering the ocean, although the function of DOM in food webs and ecosystems largely depends on its composition. Here, we employ a set of molecular and optical techniques (UV-vis absorption and fluorescence spectroscopy, 1H NMR, and ultrahigh-resolution mass spectrometry) to elucidate the composition of DOM in Antarctic glacial streams and its downstream change. Glacial DOM consisted largely of a mixture of small microbial-derived biomolecules. 1H NMR analysis of bulk water revealed that these small molecules were processed downstream into more complex, structurally unrecognizable molecules. The extent of processing varied between streams. By applying multivariate statistical (compositional data) analysis of the DOM molecular data, we identified molecular compounds that were tightly associated and moved in parallel in the glacial streams. Lakes in the middle of the flow paths enhanced water residence time and allowed for both more DOM processing and production. In conclusion, downstream processing of glacial DOM is substantial in Antarctica and affects the amounts of biologically labile substrates that enter the ocean.
Collapse
Affiliation(s)
- Morimaru Kida
- Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Carl-von-Ossietzky-Street 9-11, Oldenburg 26129, Germany
| | - Nobuhide Fujitake
- Soil Science Laboratory, Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada, Kobe, Hyogo 657-8501, Japan
| | - Taichi Kojima
- Soil Science Laboratory, Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada, Kobe, Hyogo 657-8501, Japan
| | - Yukiko Tanabe
- National Institute of Polar Research, Research Organization of Information and Systems, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan
- Department of Polar Science, SOKENDAI (The Graduate University for Advanced Studies), 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan
| | - Kentaro Hayashi
- Institute for Agro-Environmental Sciences, NARO, 3-1-3 Kannondai, Tsukuba, Ibaraki 305-8604, Japan
| | - Sakae Kudoh
- National Institute of Polar Research, Research Organization of Information and Systems, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan
- Department of Polar Science, SOKENDAI (The Graduate University for Advanced Studies), 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan
| | - Thorsten Dittmar
- Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Carl-von-Ossietzky-Street 9-11, Oldenburg 26129, Germany
- Helmholtz Institute for Functional Marine Biodiversity (HIFMB) at the University of Oldenburg, Carl-von-Ossietzky-Street 9-11, Oldenburg 26129, Germany
| |
Collapse
|
28
|
Aukes PJK, Schiff SL. Composition Wheels: Visualizing dissolved organic matter using common composition metrics across a variety of Canadian ecozones. PLoS One 2021; 16:e0253972. [PMID: 34242259 PMCID: PMC8270205 DOI: 10.1371/journal.pone.0253972] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Accepted: 06/16/2021] [Indexed: 11/25/2022] Open
Abstract
Dissolved organic matter (DOM) is a ubiquitous component of aquatic systems, impacting aquatic health and drinking water quality. These impacts depend on the mixture of organic molecules that comprise DOM. Changing climates are altering both the amount and character of DOM being transported from the terrestrial system into adjacent surface waters, yet DOM composition is not monitored as often as overall concentration. Many DOM characterization methods exist, confounding comparison of DOM composition across different studies. The objective of this research is to determine which parameters in a suite of relatively simple and common DOM characterization techniques explain the most variability in DOM composition from surface and groundwater sites. Further, we create a simple visualization tool to easily compare compositional differences in DOM. A large number of water samples (n = 250) was analyzed from six Canadian ecozones for DOM concentration, ultraviolet-visible light absorbance, molecular size, and elemental ratios. Principal component analyses was used to identify quasi-independent DOM compositional parameters that explained the highest variability in the dataset: spectral slope, specific-UV absorbance at 255nm, humic substances fraction, and dissolved organic carbon to dissolved organic nitrogen ratio. A ‘Composition Wheel’ was created by plotting these four parameters as a polygon. Our results find similarities in DOM composition irrespective of site differences in vegetation and climate. Further, two main end-member Composition Wheel shapes were revealed that correspond to DOM in organic-rich groundwaters and DOM influenced by photodegradation. The Composition Wheel approach uses easily visualized differences in polygon shape to quantify how DOM evolves by natural processes along the aquatic continuum and to track sources and degradation of DOM.
Collapse
Affiliation(s)
- Pieter J. K. Aukes
- Department of Earth & Environmental Studies, University of Waterloo, Waterloo, Ontario, Canada
- Geography & Environmental Studies, Wilfrid Laurier University, Waterloo, Ontario, Canada
- * E-mail:
| | - Sherry L. Schiff
- Department of Earth & Environmental Studies, University of Waterloo, Waterloo, Ontario, Canada
| |
Collapse
|
29
|
Gullian-Klanian M, Gold-Bouchot G, Delgadillo-Díaz M, Aranda J, Sánchez-Solís MJ. Effect of the use of Bacillus spp. on the characteristics of dissolved fluorescent organic matter and the phytochemical quality of Stevia rebaudiana grown in a recirculating aquaponic system. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:36326-36343. [PMID: 33694112 DOI: 10.1007/s11356-021-13148-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Accepted: 02/22/2021] [Indexed: 06/12/2023]
Abstract
The effect of the incorporation of mineralizing Bacillus spp. on the characteristics of fluorescent organic matter (FDOM) in a recirculating aquaculture system (Nile tilapia-Stevia rebaudiana) was evaluated. EEM-PARAFAC analysis was used to determine the composition of the dissolved organic matter and to study its relationship with nitrogen transformation. The composition and antioxidant activity of Stevia leaves were used as indicators of the benefits of bacterial supplementation on nutrient absorption. Two systems were used, each consisting of a circular fish tank (1.7 m3) and six units of the nutrient film (0.18 m3). One system was supplemented with bacteria (BS), while the other was used as control (NBS). The inclusion of Bacillus spp. facilitated mineralization and the availability of total phosphorus (TP), K+, and nitrogen, and also controlled the total ammonia nitrogen (TAN) for 56 days without water exchange. FDOM was modeled by four components (3-humic-like, 1-protein-like), which were good indicators of the process of mineralization. The fluorescence intensity in the biofilter was significantly correlated with TP, K+, temperature, and the absorption coefficient a254. The fluorescence index (FI) was a good indicator of the process of nitrification. Plants from BS required 46.4% less NO3- and 47.8% less K+ compared to the control, and absorbed 45.1% more TP. BS-Stevia leaves produced 38.6% more reducing sugars, 28.6% more flavonoids, and 35.9% more glycosylated flavonoids than the control. The fish in the BS system reached a higher final weight than NBS, resulting in a 1 kg/m3 higher gross yield. Even so, it will be necessary to reduce the pH of the water to increase the antioxidant scavenging capacity of the plants.
Collapse
Affiliation(s)
- Mariel Gullian-Klanian
- University Marist of Mérida, Periférico Nte Tablaje Catastral 13941, CP, 97300, Mérida, Yucatan, México.
| | - Gerardo Gold-Bouchot
- Oceanography Department and Geochemical and Environmental Research Group (GERG), Texas A&M University, 3146 TAMU, College Station, TX, 77843-3146, USA
| | - Mariana Delgadillo-Díaz
- University Marist of Mérida, Periférico Nte Tablaje Catastral 13941, CP, 97300, Mérida, Yucatan, México
| | - Javier Aranda
- University Marist of Mérida, Periférico Nte Tablaje Catastral 13941, CP, 97300, Mérida, Yucatan, México
| | - María José Sánchez-Solís
- University Marist of Mérida, Periférico Nte Tablaje Catastral 13941, CP, 97300, Mérida, Yucatan, México
| |
Collapse
|
30
|
Shang Y, Liu G, Wen Z, Jacinthe PA, Song K, Zhang B, Lyu L, Li S, Wang X, Yu X. Remote estimates of CDOM using Sentinel-2 remote sensing data in reservoirs with different trophic states across China. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 286:112275. [PMID: 33684799 DOI: 10.1016/j.jenvman.2021.112275] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 02/20/2021] [Accepted: 02/24/2021] [Indexed: 06/12/2023]
Abstract
Chromophoric dissolved organic matter (DOM) is called as CDOM which could affect the optical properties of surface waters, and is a useful parameter for monitoring complex inland aquatic systems. Large-scale monitoring of CDOM using remote-sensing has been a challenge due to the poor transferability of CDOM retrieval models across regions. To overcome these difficulties, a study is conducted using Sentinel-2 images, in situ reflectance spectral data, and water chemical parameters at 93 water reservoirs across China classified by trophic state. Empirical algorithms are established between CDOM absorption coefficient aCDOM(355) and reflectance band ratio (B5/B2,vegetation Red Edge/Blue) acquired in situ and via Sentinel-2 MSI sensors. Relationships are stronger (r2 > 0.7, p < 0.05) when analysis is conducted separately by trophic states. Validation models show that, by accounting for trophic state of reservoirs and using B5/B2 band ratios, it is possible to expand the geographical range of remote sensing-based models to determine CDOM. However, the accuracy of model validation decreased from oligotrophic (r2: 0.86) to eutrophic reservoirs (r2: 0.82), likely due to increased complexity of CDOM sources in nutrient-rich systems. This study provides a strategy for using local and remote-sensing data to monitor the spatial variations of CDOM in reservoirs based on different trophic states, and will contribute to water resources management.
Collapse
Affiliation(s)
- Yingxin Shang
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China
| | - Ge Liu
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China; Jingyuetan Remote Sensing Observation Station, CAS, Changchun, 130102, China.
| | - Zhidan Wen
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China; Jingyuetan Remote Sensing Observation Station, CAS, Changchun, 130102, China
| | - Pierre-Andre Jacinthe
- Department of Earth Sciences, Indiana University-Purdue University Indianapolis, IN, USA
| | - Kaishan Song
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China; Jingyuetan Remote Sensing Observation Station, CAS, Changchun, 130102, China; School of Environment and Planning, Liaocheng University, Liaocheng, 252000, China
| | - Bai Zhang
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China
| | - Lili Lyu
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China
| | - Sijia Li
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China
| | - Xiang Wang
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China
| | - Xiangfei Yu
- Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, 130118, China
| |
Collapse
|
31
|
Yang L, Zhang J, Yang GP. Mixing behavior, biological and photolytic degradation of dissolved organic matter in the East China Sea and the Yellow Sea. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 762:143164. [PMID: 33190893 DOI: 10.1016/j.scitotenv.2020.143164] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 10/13/2020] [Accepted: 10/15/2020] [Indexed: 06/11/2023]
Abstract
Optical properties of dissolved organic matter (DOM) were used as an indicator of the quantitative and qualitative changes occurring in marine DOM. The spatiotemporal distribution, bioavailability, and photoreactivity of chromophoric DOM (CDOM) and dissolved organic carbon (DOC) were investigated in the East China Sea (ECS) and the Yellow Sea (YS) during spring and summer using absorption spectroscopy and fluorescence excitation-emission matrix-parallel factor analysis. Over a 4-month laboratory study, we measured changes in six commonly used optical indices, including spectral slope (S275-295), slope ratio (SR: S275-295/S350-400), specific ultraviolet absorbance (SUVA254), ratio of the sum of protein-like components to the sum of humic-like components (Cprotein/Chumic), biological index (BIX), and humification index (HIX) to determine their changes following biological and photochemical degradation processes. Significant seasonal variations were observed in the spectral characteristics of CDOM in the ECS and the YS, indicating a stronger influence of the terrestrial origin and highly aromatic content of DOM in summer than in spring; this result was likely the consequence of an increase in the Changjiang River discharge, phytoplankton production, and biological activity, resulting in an increase in DOM production. Significant correlation between salinity and optical parameters (SUVA254, S275-295, S350-400, Cprotein/Chumic) indicated that water mixing strongly influenced the distributions of these optical parameters. The bioreactivity and photoreactivity of DOM varied depending on the source material, and the autochthonous protein-like DOM was more prone to biodegradation than the terrestrial DOM. The photodegradation processes acted preferentially on the CDOM than the colorless DOM. These results demonstrated that the optical parameters exhibited distinct changes during the mixing and the biodegradation and photodegradation processes and explained the seasonal distribution of DOM in the ECS and the YS.
Collapse
Affiliation(s)
- Lin Yang
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Jing Zhang
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Institute of Marine Chemistry, Ocean University of China, Qingdao 266100, China.
| | - Gui-Peng Yang
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; Institute of Marine Chemistry, Ocean University of China, Qingdao 266100, China
| |
Collapse
|
32
|
Zhang Y, Zhou L, Zhou Y, Zhang L, Yao X, Shi K, Jeppesen E, Yu Q, Zhu W. Chromophoric dissolved organic matter in inland waters: Present knowledge and future challenges. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 759:143550. [PMID: 33246724 DOI: 10.1016/j.scitotenv.2020.143550] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 11/01/2020] [Accepted: 11/02/2020] [Indexed: 06/12/2023]
Abstract
Chromophoric dissolved organic matter (CDOM) plays an important role in the biogeochemical cycle and energy flow of aquatic ecosystems. Thus, systematic and comprehensive understanding of CDOM dynamics is critically important for aquatic ecosystem management. CDOM spans multiple study fields, including analytical chemistry, biogeochemistry, water color remote sensing, and global environmental change. Here, we thoroughly summarize the progresses of recent studies focusing on the characterization, distribution, sources, composition, and fate of CDOM in inland waters. Characterization methods, remote sensing estimation, and biogeochemistry cycle processes were the hotspots of CDOM studies. Specifically, optical, isotope, and mass spectrometric techniques have been widely used to characterize CDOM abundance, composition, and sources. Remote sensing is an effective tool to map CDOM distribution with high temporal and spatial resolutions. CDOM dynamics are mainly determined by watershed-related processes, including rainfall discharge, groundwater, wastewater discharges/effluents, and biogeochemical cycling occurring in soil and water bodies. We highlight the underlying mechanisms of the photochemical degradation and microbial decomposition of CDOM, and emphasize that photochemical and microbial processes of CDOM in inland waters accelerate nutrient cycling and regeneration in the water column and also exacerbate global warming by releasing greenhouse gases. Future study directions to improve the understanding of CDOM dynamics in inland waters are proposed. This review provides an interdisciplinary view and new insights on CDOM dynamics in inland waters.
Collapse
Affiliation(s)
- Yunlin Zhang
- Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Lei Zhou
- Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yongqiang Zhou
- Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Liuqing Zhang
- Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Xiaolong Yao
- Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Kun Shi
- Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Erik Jeppesen
- Department of Bioscience and Arctic Research Centre, Aarhus University, Vejlsøvej 25, DK-8600 Silkeborg, Denmark; Sino-Danish Centre for Education and Research, Beijing 100190, China; Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara, Turkey.
| | - Qian Yu
- Department of Geoscience, University of Massachusetts, Amherst, MA, USA.
| | - Weining Zhu
- Ocean College, Zhejiang University, Zhoushan, Zhejiang, China.
| |
Collapse
|
33
|
Lapierre J, Collins SM, Oliver SK, Stanley EH, Wagner T. Inconsistent browning of northeastern U.S. lakes despite increased precipitation and recovery from acidification. Ecosphere 2021. [DOI: 10.1002/ecs2.3415] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Jean‐Francois Lapierre
- Département de sciences biologiques Université de Montréal Montréal QuébecH3C 3J7Canada
- Groupe de Recherche Interuniversitaire en Limnologie (GRIL) Université du Québec à Montréal Montréal QuebecH3C 3P8Canada
| | - Sarah M. Collins
- Department of Zoology and Physiology University of Wyoming Laramie Wyoming82701USA
- Program in Ecology University of Wyoming Laramie Wyoming82701USA
| | - Samantha K. Oliver
- U.S. Geological Survey Upper Midwest Water Science Center Middleton Wisconsin53562USA
| | - Emily H. Stanley
- Center for Limnology University of Wisconsin‐Madison Madison Wisconsin53706USA
| | - Tyler Wagner
- U.S. Geological Survey Pennsylvania Cooperative Fish and Wildlife Unit The Pennsylvania State University University Park Pennsylvania16802USA
| |
Collapse
|
34
|
Tareq SM, Haque MM, Niloy NM. Comment on "Spatiotemporal variations of DOM components in the Kushiro River impacted by a wetland" by Shafiquzzaman et al. 2020. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:4887-4888. [PMID: 33037544 DOI: 10.1007/s11356-020-11098-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 10/01/2020] [Indexed: 06/11/2023]
Affiliation(s)
- Shafi M Tareq
- Hydrobiogeochemistry and Pollution Control Laboratory, Department of Environmental Sciences, Jahangirnagar University, Dhaka, 1342, Bangladesh.
| | - Md Morshedul Haque
- Hydrobiogeochemistry and Pollution Control Laboratory, Department of Environmental Sciences, Jahangirnagar University, Dhaka, 1342, Bangladesh
| | - Nahin Mostofa Niloy
- Hydrobiogeochemistry and Pollution Control Laboratory, Department of Environmental Sciences, Jahangirnagar University, Dhaka, 1342, Bangladesh
| |
Collapse
|
35
|
Bianco A, Sordello F, Ehn M, Vione D, Passananti M. Degradation of nanoplastics in the environment: Reactivity and impact on atmospheric and surface waters. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 742:140413. [PMID: 32623157 DOI: 10.1016/j.scitotenv.2020.140413] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 06/19/2020] [Accepted: 06/19/2020] [Indexed: 05/26/2023]
Abstract
Microplastics (MPs) and nanoplastics (NPs) are ubiquitous and contaminate soil, surface waters, atmospheric aerosol, precipitations, indoor and outdoor environments. However, the occurrence, transformation and fate of NPs in the environment are still unclear. In this work, polystyrene nanoparticles (PS-NPs) are used as a proxy of NPs to study their reactivity and potential impact on atmospheric and surface waters. In particular, the reactivity with hydroxyl radicals (OH) in the aqueous phase is investigated. For the first time, a reactivity constant for the reaction of NPs with OH is measured, strongly dependent on the exposed particle surface area of NPs. Degradation products (short chain carboxylic acids and aromatic compounds), obtained by direct and OH-mediated photolysis of PS-NPs suspensions, are identified by mass spectrometry. Irradiation of a PS-NPs suspension under natural sunlight for 1 year has shown the formation of formic acid and organic compounds similar to those found in riverine and cloud dissolved organic matter, which could contribute significantly to the dissolved organic matter in the aqueous phase.
Collapse
Affiliation(s)
- Angelica Bianco
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, FI-00014, Finland
| | - Fabrizio Sordello
- Dipartimento di Chimica, Università di Torino, Via Pietro Giuria 5, 10125 Torino, Italy
| | - Mikael Ehn
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, FI-00014, Finland
| | - Davide Vione
- Dipartimento di Chimica, Università di Torino, Via Pietro Giuria 5, 10125 Torino, Italy
| | - Monica Passananti
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, FI-00014, Finland; Dipartimento di Chimica, Università di Torino, Via Pietro Giuria 5, 10125 Torino, Italy.
| |
Collapse
|
36
|
Deininger A, Kaste Ø, Frigstad H, Austnes K. Organic nitrogen steadily increasing in Norwegian rivers draining to the Skagerrak coast. Sci Rep 2020; 10:18451. [PMID: 33116239 PMCID: PMC7595164 DOI: 10.1038/s41598-020-75532-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 10/14/2020] [Indexed: 11/27/2022] Open
Abstract
Declining atmospheric nitrogen (N) deposition, through reduction in the direct input of inorganic N, may result in less inorganic N being leached from soils to freshwaters (dissolved inorganic N = DIN). Declining sulphur deposition, through reducing the ionic strength in soil water, increases the solubility and mobility of organic soil compounds and may result in increased leaching of organically bound N to freshwaters (total organic N = TON). It is unknown to which extent these two independents and opposing trends, i.e. DIN decline versus TON increase, may affect the nutrient balance (load, stoichiometry) of river water draining into coastal zones. By combining long-term atmospheric and riverine monitoring data of the five major Norwegian rivers draining to the Skagerrak coast, we show that over the past 27 years (1990-2017) river water nutrient composition, and specifically N stoichiometry has been steadily shifting from inorganic to organic fractions, with correlations to changes in human pressures (air pollution), but especially climate (precipitation, temperature, discharge). This shift in nutrient quality may have large consequences on the nutrient cycling in both freshwater and coastal ecosystems and illustrates the complex interactions of multiple stressors (here: N deposition, S deposition, and climate change) on aquatic ecosystems.
Collapse
Affiliation(s)
- A Deininger
- Centre for Coastal Research, University of Agder, Kristiansand, Norway.
- Norwegian Institute for Water Research (NIVA), Oslo, Norway.
| | - Ø Kaste
- Centre for Coastal Research, University of Agder, Kristiansand, Norway
- Norwegian Institute for Water Research (NIVA), Oslo, Norway
| | - H Frigstad
- Centre for Coastal Research, University of Agder, Kristiansand, Norway
- Norwegian Institute for Water Research (NIVA), Oslo, Norway
| | - K Austnes
- Norwegian Institute for Water Research (NIVA), Oslo, Norway
| |
Collapse
|
37
|
Rodriguez-Avella KA, Baraer M, Mark B, McKenzie J, Somers L. Comparing the performance of three methods to assess DOM dynamics within two distinct glacierized watersheds of the tropical Andes. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 265:115052. [PMID: 32806424 DOI: 10.1016/j.envpol.2020.115052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 06/15/2020] [Accepted: 06/16/2020] [Indexed: 06/11/2023]
Abstract
Dissolved organic matter (DOM) is recognized as a good indicator of water quality as its concentration is influenced by land use, rainwater, windborne material and anthropogenic activities. Recent technological advances make it possible to characterize fluorescent dissolved organic matter (FDOM), the fraction of DOM that fluoresces. Among these advances, portable fluorometers and benchtop fluorescence excitation and emission spectroscopy coupled with a parallel factor analysis (EEM-PARAFAC) have shown to be reliable. Despite their rising popularity, there is still a need to evaluate the extent to which these techniques can assess DOM dynamics at the watershed scale. We compare the performance of in-situ measurements of FDOM with laboratory measurements of fluorescence spectroscopy within the context of two distinct glacierized watersheds in Peru. Glacierized watersheds represent unique testing environments with contrasting DOM conditions, flowing from pristine, vegetation-free headwaters through locations with obvious anthropogenic influences. We used an in-situ fluorometer and a portable multimeter to take 38 measurements of FDOM, pH and turbidity throughout the two catchments. Additionally, samples were analyzed in the laboratory using the EEM-PARAFAC method. Results were compared to dissolved organic carbon (DOC) measurements using standard high-temperature catalytic oxidation. Our results show that the three techniques together were able to capture the DOM dynamics for both studied watersheds. Taken individually, all three methods allowed detection of the watershed DOM main points of sources but in a more limited way. Due to the narrow bandwidth of the portable fluorometer used in the study, FDOM measurements were almost non-detectable to protein-like substances. Indeed, the more demanding EEM-PARAFAC was able to both differentiate between potential sources of DOM and provide an estimate of relative concentrations of different organic components. Finally, similar to FDOM but to a lesser extent, the DOC measurements showed some limits where protein-like substances make up most of the DOM composition.
Collapse
Affiliation(s)
- K A Rodriguez-Avella
- École de technologie supérieure, University of Quebec, 1100 Notre-Dame Street West, Montreal QC H3C 1K3, Canada.
| | - M Baraer
- École de technologie supérieure, University of Quebec, 1100 Notre-Dame Street West, Montreal QC H3C 1K3, Canada
| | - B Mark
- Department of Geography, The Ohio State University, 1036 Derby Hall, 154 North Oval Mall, Columbus, 43210-1361, United States
| | - J McKenzie
- Department of Earth and Planetary Sciences, McGill University, 3450 University Street, Montreal QC H3A 2A7, Canada
| | - L Somers
- Department of Earth and Planetary Sciences, McGill University, 3450 University Street, Montreal QC H3A 2A7, Canada
| |
Collapse
|
38
|
Patriarca C, Balderrama A, Može M, Sjöberg PJR, Bergquist J, Tranvik LJ, Hawkes JA. Investigating the Ionization of Dissolved Organic Matter by Electrospray. Anal Chem 2020; 92:14210-14218. [PMID: 32940031 PMCID: PMC7584329 DOI: 10.1021/acs.analchem.0c03438] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
![]()
Electrospray
ionization (ESI) operating in the negative mode coupled
to high-resolution mass spectrometry is the most popular technique
for the characterization of dissolved organic matter (DOM). The vast
molecular heterogeneity and the functional group diversity of this
complex mixture prevents the efficient ionization of the organic material
by a single ionization source, so the presence of uncharacterized
material is unavoidable. The extent of this poorly ionizable pool
of carbon is unknown, is presumably variable between samples, and
can only be assessed by the combination of analysis with a uniform
detection method. Charged aerosol detection (CAD), whose response
is proportional to the amount of nonvolatile material and is independent
from the physicochemical properties of the analytes, is a suitable
candidate. In this study, a fulvic acid mixture was fractionated and
analyzed by high-pressure liquid chromatography–mass spectrometry
in order to investigate the polarity and size distributions of highly
and poorly ionizable material in the sample. Additionally, DOM samples
of terrestrial and marine origins were analyzed to evaluate the variability
of these pools across the land–sea aquatic continuum. The relative
response factor values indicated that highly ionizable components
of aquatic DOM mixtures are more hydrophilic and have lower molecular
weight than poorly ionizable components. Additionally, a discrepancy
between the samples of terrestrial and marine origins was found, indicating
that marine samples are better represented by ESI than terrestrial
samples, which have an abundant portion of hydrophobic poorly ionizable
material.
Collapse
Affiliation(s)
- Claudia Patriarca
- Analytical Chemistry, Department of Chemistry-BMC, Uppsala University, 75237 Uppsala, Sweden
| | - Andrea Balderrama
- Analytical Chemistry, Department of Chemistry-BMC, Uppsala University, 75237 Uppsala, Sweden.,Limnology, Department of Ecology and Genetics, Uppsala University, 75236 Uppsala, Sweden
| | - Martina Može
- Analytical Chemistry, Department of Chemistry-BMC, Uppsala University, 75237 Uppsala, Sweden
| | - Per J R Sjöberg
- Analytical Chemistry, Department of Chemistry-BMC, Uppsala University, 75237 Uppsala, Sweden
| | - Jonas Bergquist
- Analytical Chemistry, Department of Chemistry-BMC, Uppsala University, 75237 Uppsala, Sweden
| | - Lars J Tranvik
- Limnology, Department of Ecology and Genetics, Uppsala University, 75236 Uppsala, Sweden
| | - Jeffrey A Hawkes
- Analytical Chemistry, Department of Chemistry-BMC, Uppsala University, 75237 Uppsala, Sweden
| |
Collapse
|
39
|
Zhang L, Fang W, Li X, Gao G, Jiang J. Linking bacterial community shifts with changes in the dissolved organic matter pool in a eutrophic lake. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 719:137387. [PMID: 32114229 DOI: 10.1016/j.scitotenv.2020.137387] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Revised: 02/14/2020] [Accepted: 02/16/2020] [Indexed: 06/10/2023]
Abstract
Aquatic bacterial communities play crucial roles in the circulation of nutrients in watershed ecosystems. However, the interaction between bacterial communities and chromophoric dissolved organic matter (CDOM) in freshwater ecosystems has not been studied in depth. In our study, we examined the constitution and interactions of CDOM with the bacterial community in Lake Chaohu and its inflow rivers under the influence of different exogenous pollutants. The results revealed that the bacterial community diversity in the inflow rivers was significantly lower than that in the lake sites. Clustering of different types of polluted inflow rivers integrated with the most abundant genera observed in specific areas indicated that environmentally guided species selection had a large impact on the composition of aquatic bacterial communities. Moreover, our study suggests that communities in lake environments may be more susceptible to interference through a variety of physiologies or via functional redundancy, allowing them to preserve their community structure. Through linear discriminant analysis effect size (Lefse) methods, we revealed that some taxa (from phylum to genus) were consistently enriched in the lake sites. Based on correlation network analysis results, the supersession niches of bacterial community members related to different CDOM in the biogeochemical process was determined. This study provides an ecological basis for the control of external pollution and the protection of the water environment in watershed ecosystems.
Collapse
Affiliation(s)
- Lei Zhang
- School of Civil Engineering and Architecture, Chuzhou University, Chuzhou 239000, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
| | - Wangkai Fang
- School of Civil Engineering and Architecture, Chuzhou University, Chuzhou 239000, China
| | - Xingchen Li
- School of Civil Engineering and Architecture, Chuzhou University, Chuzhou 239000, China
| | - Guang Gao
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Jiahu Jiang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| |
Collapse
|
40
|
Carstensen J, Conley DJ, Almroth-Rosell E, Asmala E, Bonsdorff E, Fleming-Lehtinen V, Gustafsson BG, Gustafsson C, Heiskanen AS, Janas U, Norkko A, Slomp C, Villnäs A, Voss M, Zilius M. Factors regulating the coastal nutrient filter in the Baltic Sea. AMBIO 2020; 49:1194-1210. [PMID: 31707582 PMCID: PMC7128010 DOI: 10.1007/s13280-019-01282-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 09/17/2019] [Accepted: 09/23/2019] [Indexed: 05/30/2023]
Abstract
The coastal zone of the Baltic Sea is diverse with strong regional differences in the physico-chemical setting. This diversity is also reflected in the importance of different biogeochemical processes altering nutrient and organic matter fluxes on the passage from land to sea. This review investigates the most important processes for removal of nutrients and organic matter, and the factors that regulate the efficiency of the coastal filter. Nitrogen removal through denitrification is high in lagoons receiving large inputs of nitrate and organic matter. Phosphorus burial is high in archipelagos with substantial sedimentation, but the stability of different burial forms varies across the Baltic Sea. Organic matter processes are tightly linked to the nitrogen and phosphorus cycles. Moreover, these processes are strongly modulated depending on composition of vegetation and fauna. Managing coastal ecosystems to improve the effectiveness of the coastal filter can reduce eutrophication in the open Baltic Sea.
Collapse
Affiliation(s)
- Jacob Carstensen
- Department of Bioscience, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | - Daniel J. Conley
- Department of Geology, Lund University, Sölvegatan 12, 223 62 Lund, Sweden
| | | | - Eero Asmala
- Tvärminne Zoological Station, University of Helsinki, J.A. Palmenin tie 260, 10900 Hanko, Finland
| | - Erik Bonsdorff
- Environmental and Marine Biology, Åbo Akademi University, BioCity, 20500 Turku, Finland
| | | | - Bo G. Gustafsson
- Tvärminne Zoological Station, University of Helsinki, J.A. Palmenin tie 260, 10900 Hanko, Finland
- Stockholm University Baltic Sea Centre, 106 91 Stockholm, Sweden
| | - Camilla Gustafsson
- Tvärminne Zoological Station, University of Helsinki, J.A. Palmenin tie 260, 10900 Hanko, Finland
| | | | - Urzsula Janas
- Department of Experimental Ecology of Marine Organisms, Institute of Oceanography, University of Gdańsk, al. Marsz. J. Pilsudskiego 46, 81-378 Gdynia, Poland
| | - Alf Norkko
- Tvärminne Zoological Station, University of Helsinki, J.A. Palmenin tie 260, 10900 Hanko, Finland
| | - Caroline Slomp
- Department of Earth Sciences, Utrecht University, Princetonlaan 8A, 3584 CB Utrecht, The Netherlands
| | - Anna Villnäs
- Tvärminne Zoological Station, University of Helsinki, J.A. Palmenin tie 260, 10900 Hanko, Finland
| | - Maren Voss
- Department of Biological Oceanography, Leibniz Institute of Baltic Sea Research, Seestr. 15, 18119 Rostock, Germany
| | - Mindaugas Zilius
- Marine Research Institute, Universiteto al. 17, 92294 Klaipeda, Lithuania
| |
Collapse
|
41
|
El-Nahhal I, Redon R, Raynaud M, El-Nahhal Y, Mounier S. Characterization of the fate and changes of post-irradiance fluorescence signal of filtered anthropogenic effluent dissolved organic matter from wastewater treatment plant in the coastal zone of Gapeau river. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:23141-23158. [PMID: 32333342 DOI: 10.1007/s11356-020-08842-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 04/13/2020] [Indexed: 06/11/2023]
Abstract
Anthropogenic effluent dissolved organic matter (DOM) plays an important role in coastal zone pollution. The objectives of the present study were to characterize the fluorescence signal of anthropogenic effluent DOM from wastewater treatment plant and to evaluate the effect of solar irradiation on the fluorescence signal in the coastal zone. Solar irradiation experiments were conducted to evaluate the effect photochemical degradation using excitation-emission matrix (EEM) method combined with parallel factor analysis (PARAFAC). Results showed high fluorescence of DOM before irradiation and the intensity tends to decrease after 4th and 15th day of irradiation. Rapid photochemical degradation of humic-like fluorophores and appearance of a post-irradiance dominant anthropogenic effluent DOM fluorophores were also observed after irradiation. Our experiments showed a sharp reduction in fluorescence intensity which occurred after 4th day of solar irradiation and the fluorescence signal did not disappeared after 15th day indicating the formation of a specific signal due to solar irradiation. PARAFAC model divided the bulk EEM spectra into three individual fluorescent components with C1 "terrestrial humic-like" and C2 "humic-like of longer wavelength" and C3 is a noisy component with two emission maxima. Multilinear regression of PARAFAC components contribution with mixing composition was most suitable according to the equation C*i = AWWi,0 + AWWi,1.fSW + AWWi,2.fRW, where C*i is the normalized contribution of PARAFAC component number i in a given irradiation day; AWWi,0, AWWi,1, AWWi,2 are the multilinear regression coefficients and contain implicitly the effect of fWW; and WW, SW, and RW are treated wastewater, sea water, and river water respectively. The values of AWWi,0, AWWi,1, and AWWi,2 fitted second-order kinetics with irradiation process with kinetic constant of 9.68, - 987.35, and - 977.67 respectively for C1 equation and the same trend for C2 and no values for C3 due to its noisy character indicating the rapid degradation with increase of fSW and fRW and the predominance of the residual fluorescence coming from fWW which is the content fraction of anthropogenic effluent DOM because AWWi,0 was 100 times less sensitive to photobleaching. A suitable model for predicting the fluorescence EEMs as a function of mixing composition was developed.
Collapse
Affiliation(s)
- Ibrahim El-Nahhal
- CNRS, IRD, MIO, Université de Toulon, Aix Marseille Univ, CS 60584, 83041, Toulon Cedex 9, France.
| | - Roland Redon
- CNRS, IRD, MIO, Université de Toulon, Aix Marseille Univ, CS 60584, 83041, Toulon Cedex 9, France
| | - Michel Raynaud
- CNRS, IRD, MIO, Université de Toulon, Aix Marseille Univ, CS 60584, 83041, Toulon Cedex 9, France
| | - Yasser El-Nahhal
- Department of Environmental and Earth Sciences, Faculty of Science, The Islamic University-Gaza, P.O Box 108, 00970, Gaza, Gaza Strip, Palestine
| | - Stéphane Mounier
- CNRS, IRD, MIO, Université de Toulon, Aix Marseille Univ, CS 60584, 83041, Toulon Cedex 9, France
| |
Collapse
|
42
|
Tang J, Wang W, Yang L, Qiu Q, Lin M, Cao C, Li X. Seasonal variation and ecological risk assessment of dissolved organic matter in a peri-urban critical zone observatory watershed. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 707:136093. [PMID: 31863979 DOI: 10.1016/j.scitotenv.2019.136093] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 11/07/2019] [Accepted: 12/10/2019] [Indexed: 06/10/2023]
Abstract
Peri-urban ecosystems are among the most intensive areas in terms of competition between different ecosystem components. Dissolved organic matter (DOM) plays a significant role in aquatic carbon cycling. The chemical composition of DOM and associated potential ecological risks in peri-urban aquatic ecosystems are poorly understood. Herein, we used fluorescence excitation-emission matrix and parallel factor analysis (EEM-PARAFAC) to characterize DOM in a peri-urban critical zone observatory watershed in Eastern China. According to the theory of natural disaster risk formation, we calculated the ecological risk of DOM in the peri-urban watershed. Seasonal variation in DOM concentrations was observed, whereas fluorescent DOM concentrations were site-specific across four sub-watersheds. The analysis of DOM absorption properties revealed the presence of DOM components with high aromatic content and large molecular weight in the watershed. Four fluorescent components (two humic-like and two protein-like substances) were identified using the PARAFAC model. Spatial distribution analysis showed that DOM quality was mainly influenced by human activities, and the proportion of protein-like substance (C3) was strongly correlated with anthropogenic parameters. The distribution of optical indices indicated diverse sources of DOM in the watershed. Ecological risk related to DOM was greater in the dry season than the wet season. There was a slight risk in most areas, with an extreme risk in areas experiencing the most intensive human disturbance, which were also extremely or heavily vulnerable. The results emphasize the strong influence of human disturbance on the ecological risk of DOM in peri-urban aquatic ecosystems. Our study provides useful information for ecological risk assessment of DOM that is difficult to obtain using traditional chemical analysis.
Collapse
Affiliation(s)
- Jianfeng Tang
- Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Ningbo Urban Environment Observation and Research Station, Chinese Academy of Sciences, Ningbo 315800, China.
| | - Wendong Wang
- Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lei Yang
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Qianlinglin Qiu
- Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Meixia Lin
- Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Changli Cao
- Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Xinhu Li
- College of Architecture and Urban Planning, Tongji University, Shanghai 200082, China
| |
Collapse
|
43
|
Roebuck JA, Seidel M, Dittmar T, Jaffé R. Controls of Land Use and the River Continuum Concept on Dissolved Organic Matter Composition in an Anthropogenically Disturbed Subtropical Watershed. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:195-206. [PMID: 31742395 DOI: 10.1021/acs.est.9b04605] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
About 250 Tg of dissolved organic carbon are annually transported from inland waters to coastal systems making rivers a critical link between terrestrial and ocean carbon pools. During transport through fluvial systems, various biogeochemical processes selectively remove or transform labile material, effectively altering the composition of dissolved organic matter (DOM) exported to the ocean. The river continuum concept (RCC) has been historically used as a model to predict the fate and quality of organic matter along a river continuum. However, the conversion of natural landscapes for urban and agricultural practices can also alter the sources and quality of DOM exported from fluvial systems, and the RCC may be significantly limited in predicting DOM quality in anthropogenically impacted watersheds. Here, we studied DOM dynamics in the Altamaha River watershed in Georgia, USA, a fluvial system where headwater streams are highly impacted by anthropogenic activities. The primary goal of this study was to quantitatively assess the importance of both the RCC and land use as environmental drivers controlling DOM composition. Land use was a stronger predictor of spatial variation (∼50%) in DOM composition defined by both excitation-emission matrix-parallel factor analysis (EEM-PARAFAC) and ultrahigh-resolution mass spectrometry. This is compared to an 8% explained variability that can be attributed to the RCC. This study highlights the importance of incorporating land use among other controls into the RCC to better predict the fate and quality of DOM exported from terrestrial to coastal systems.
Collapse
Affiliation(s)
- Jesse Alan Roebuck
- Southeast Environmental Research Center and Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| | - Michael Seidel
- Research Group for Marine Geochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, D-26129 Oldenburg, Germany
| | - Thorsten Dittmar
- Research Group for Marine Geochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, D-26129 Oldenburg, Germany
- Helmholtz Institute for Functional Marine Diversity, University of Oldenburg (HIFMB), D-26129 Oldenburg, Germany
| | - Rudolf Jaffé
- Southeast Environmental Research Center and Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| |
Collapse
|
44
|
Kitidis V, Shutler JD, Ashton I, Warren M, Brown I, Findlay H, Hartman SE, Sanders R, Humphreys M, Kivimäe C, Greenwood N, Hull T, Pearce D, McGrath T, Stewart BM, Walsham P, McGovern E, Bozec Y, Gac JP, van Heuven SMAC, Hoppema M, Schuster U, Johannessen T, Omar A, Lauvset SK, Skjelvan I, Olsen A, Steinhoff T, Körtzinger A, Becker M, Lefevre N, Diverrès D, Gkritzalis T, Cattrijsse A, Petersen W, Voynova YG, Chapron B, Grouazel A, Land PE, Sharples J, Nightingale PD. Winter weather controls net influx of atmospheric CO 2 on the north-west European shelf. Sci Rep 2019; 9:20153. [PMID: 31882779 PMCID: PMC6934492 DOI: 10.1038/s41598-019-56363-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 12/06/2019] [Indexed: 11/08/2022] Open
Abstract
Shelf seas play an important role in the global carbon cycle, absorbing atmospheric carbon dioxide (CO2) and exporting carbon (C) to the open ocean and sediments. The magnitude of these processes is poorly constrained, because observations are typically interpolated over multiple years. Here, we used 298500 observations of CO2 fugacity (fCO2) from a single year (2015), to estimate the net influx of atmospheric CO2 as 26.2 ± 4.7 Tg C yr-1 over the open NW European shelf. CO2 influx from the atmosphere was dominated by influx during winter as a consequence of high winds, despite a smaller, thermally-driven, air-sea fCO2 gradient compared to the larger, biologically-driven summer gradient. In order to understand this climate regulation service, we constructed a carbon-budget supplemented by data from the literature, where the NW European shelf is treated as a box with carbon entering and leaving the box. This budget showed that net C-burial was a small sink of 1.3 ± 3.1 Tg C yr-1, while CO2 efflux from estuaries to the atmosphere, removed the majority of river C-inputs. In contrast, the input from the Baltic Sea likely contributes to net export via the continental shelf pump and advection (34.4 ± 6.0 Tg C yr-1).
Collapse
Affiliation(s)
| | - Jamie D Shutler
- University of Exeter, College of Life and Environmental Sciences, Exeter, UK
| | - Ian Ashton
- University of Exeter, College of Life and Environmental Sciences, Exeter, UK
| | | | - Ian Brown
- Plymouth Marine Laboratory, Plymouth, UK
| | | | | | | | - Matthew Humphreys
- Ocean and Earth Science, University of Southampton, Southampton, UK
- School of Environmental Sciences, University of East Anglia, Norwich, UK
| | | | - Naomi Greenwood
- Centre for Environment Fisheries and Aquaculture Science (Cefas), Lowestoft, UK
| | - Tom Hull
- Centre for Environment Fisheries and Aquaculture Science (Cefas), Lowestoft, UK
| | - David Pearce
- Centre for Environment Fisheries and Aquaculture Science (Cefas), Lowestoft, UK
| | | | | | | | | | - Yann Bozec
- Station Biologique de Roscoff, UMR CNRS - UPMC 7144 - Equipe Chimie Marine, Roscoff, France
| | - Jean-Philippe Gac
- Station Biologique de Roscoff, UMR CNRS - UPMC 7144 - Equipe Chimie Marine, Roscoff, France
| | | | - Mario Hoppema
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - Ute Schuster
- University of Exeter, College of Life and Environmental Sciences, Exeter, UK
| | - Truls Johannessen
- Geophysical Institute, University of Bergen and Bjerknes Center for Climate Research, Bergen, Norway
| | - Abdirahman Omar
- NORCE Norwegian Research Centre, Bjerknes Center for Climate Research, Bergen, Norway
| | - Siv K Lauvset
- NORCE Norwegian Research Centre, Bjerknes Center for Climate Research, Bergen, Norway
| | - Ingunn Skjelvan
- NORCE Norwegian Research Centre, Bjerknes Center for Climate Research, Bergen, Norway
| | - Are Olsen
- Geophysical Institute, University of Bergen and Bjerknes Center for Climate Research, Bergen, Norway
| | | | - Arne Körtzinger
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | - Meike Becker
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
- Geophysical Institute, University of Bergen and Bjerknes Center for Climate Research, Bergen, Norway
| | - Nathalie Lefevre
- Sorbonne Universités (UPMC, Univ Paris 06)-IRD-CNRS-MNHN, LOCEAN, Paris, France
| | - Denis Diverrès
- Institut de Recherche pour le Développement (IRD), centre de Bretagne, Plouzané, France
| | | | | | - Wilhelm Petersen
- Helmholtz Zentrum Geesthacht, Centre for Materials and Coastal Research, Geesthacht, Germany
| | - Yoana G Voynova
- Helmholtz Zentrum Geesthacht, Centre for Materials and Coastal Research, Geesthacht, Germany
| | - Bertrand Chapron
- Institut Francais Recherche Pour ĹExploitation de la Mer, Pointe du Diable, 29280, Plouzané, France
| | - Antoine Grouazel
- Institut Francais Recherche Pour ĹExploitation de la Mer, Pointe du Diable, 29280, Plouzané, France
| | | | - Jonathan Sharples
- University of Liverpool, School of Environmental Sciences, Liverpool, UK
| | | |
Collapse
|
45
|
Anderson OR. Atmospheric respiratory CO 2 efflux by aquatic suspended particle-bound microbial communities: A laboratory experimental study. Heliyon 2019; 5:e02816. [PMID: 31763477 PMCID: PMC6859224 DOI: 10.1016/j.heliyon.2019.e02816] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Revised: 09/14/2019] [Accepted: 11/06/2019] [Indexed: 11/29/2022] Open
Abstract
Natural sources of atmospheric CO2 are of increasing interest as possible contributors to global climate warming. This study documents the amount of respiratory CO2 contributed by microbial communities associated with suspended particulates in aquatic water columns. Microcosms containing three different sources of water (pond freshwater, NY East River estuary and Hudson River estuary) were used to experimentally determine the atmospheric respiratory CO2 released from particle-associated microbes. Two different approaches were used. In the first, finely powdered dried cereal leaves (alfalfa) were added to each of the three microcosms as a consistent source of particulate organic matter (POM). In the second, only Hudson River estuary water samples were used with natural densities of POM. Respiration rates associated with two sizes of particles were assessed: 1) ≥ 200 μm and 2) ≥ 50 μm but less than 200 μm. The total respiration rate for the three microcosms with cereal leaf POM ranged from 5.09 to 14.87 μmol CO2 min−1 L−1. Of this, the amount contributed by larger particulates was in the range of 55–63%; and for smaller particulates ranged from 18 to 32 %. Data for microcosms containing water from the Hudson River estuary, with natural particulates, was as follows: total respiration ranged from ∼3 μmol CO2 min−1 L−1 to ∼3.73 μmol CO2 min−1 L−1. Larger particulates contributed approximately 40% of total respiration, and that of smaller particulates was substantially less (4–5% of total). Overall, these results indicate that microbial communities associated with particulates in the water column (especially larger particulates) may contribute substantial amounts of CO2 to the atmosphere.
Collapse
Affiliation(s)
- O Roger Anderson
- Biology and Paleoecology, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, 10964, USA
| |
Collapse
|
46
|
Broman E, Asmala E, Carstensen J, Pinhassi J, Dopson M. Distinct Coastal Microbiome Populations Associated With Autochthonous- and Allochthonous-Like Dissolved Organic Matter. Front Microbiol 2019; 10:2579. [PMID: 31787958 PMCID: PMC6854034 DOI: 10.3389/fmicb.2019.02579] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 10/24/2019] [Indexed: 11/16/2022] Open
Abstract
Coastal zones are important transitional areas between the land and sea, where both terrestrial and phytoplankton supplied dissolved organic matter (DOM) are respired or transformed. As climate change is expected to increase river discharge and water temperatures, DOM from both allochthonous and autochthonous sources is projected to increase. As these transformations are largely regulated by bacteria, we analyzed microbial community structure data in relation to a 6-month long time-series dataset of DOM characteristics from Roskilde Fjord and adjacent streams, Denmark. The results showed that the microbial community composition in the outer estuary (closer to the sea) was largely associated with salinity and nutrients, while the inner estuary formed two clusters linked to either nutrients plus allochthonous DOM or autochthonous DOM characteristics. In contrast, the microbial community composition in the streams was found to be mainly associated with allochthonous DOM characteristics. A general pattern across the land-to-sea interface was that Betaproteobacteria were strongly associated with humic-like DOM [operational taxonomic units (OTUs) belonging to family Comamonadaceae], while distinct populations were instead associated with nutrients or abiotic variables such as temperature (Cyanobacteria genus Synechococcus) and salinity (Actinobacteria family Microbacteriaceae). Furthermore, there was a stark shift in the relative abundance of OTUs between stream and marine stations. This indicates that as DOM travels through the land-to-sea interface, different bacterial guilds continuously degrade it.
Collapse
Affiliation(s)
- Elias Broman
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, Kalmar, Sweden
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
| | - Eero Asmala
- Tvärminne Zoological Station, University of Helsinki, Hanko, Finland
| | | | - Jarone Pinhassi
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, Kalmar, Sweden
| | - Mark Dopson
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, Kalmar, Sweden
| |
Collapse
|
47
|
CDOM Absorption Properties of Natural Water Bodies along Extreme Environmental Gradients. WATER 2019. [DOI: 10.3390/w11101988] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We present absorption properties of colored dissolved organic matter (CDOM) sampled in six different water bodies along extreme altitudinal, latitudinal, and trophic state gradients. Three sites are in Norway: the mesotrophic Lysefjord (LF), Samnangerfjord (SF), and Røst Coastal Water (RCW); two sites are in China: the oligotrophic Lake Namtso (LN) and the eutrophic Bohai Sea (BS); and one site is in Uganda: the eutrophic Lake Victoria (LV). The site locations ranged from equatorial to subarctic regions, and they included water types from oligotrophic to eutrophic and altitudes from 0 m to 4700 m. The mean CDOM absorption coefficients at 440 nm [ a CDOM ( 440 ) ] and 320 nm [ a CDOM ( 320 ) ] varied in the ranges 0.063–0.35 m − 1 and 0.34–2.28 m − 1 , respectively, with highest values in LV, Uganda and the lowest in the high-altitude LN, Tibet. The mean spectral slopes S 280 − 500 and S 350 − 500 were found to vary in the ranges of 0.017–0.032 nm − 1 and 0.013–0.015 nm − 1 , respectively. The highest mean value for S 280 − 500 as well as the lowest mean value for S 350 − 500 were found in LN. Scatter plots of S 280 − 500 versus a CDOM ( 440 ) and a CDOM ( 320 ) values ranges revealed a close connection between RCW, LF, and SF on one side, and BS and LV on the other side. CDOM seems to originate from terrestrial sources in LF, SF, BS, and LV, while RCW is characterized by autochthonous-oceanic CDOM, and LN by autochthonous CDOM. Photobleaching of CDOM is prominent in LN, demonstrated by absorption towards lower wavelengths in the UV spectrum. We conclude that high altitudes, implying high levels of UV radiation and oligotrophic water conditions are most important for making a significant change in CDOM absorption properties.
Collapse
|
48
|
Ávila MP, Brandão LPM, Brighenti LS, Tonetta D, Reis MP, Stæhr PA, Asmala E, Amado AM, Barbosa FAR, Bezerra-Neto JF, Nascimento AMA. Linking shifts in bacterial community with changes in dissolved organic matter pool in a tropical lake. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 672:990-1003. [PMID: 30981171 DOI: 10.1016/j.scitotenv.2019.04.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 03/15/2019] [Accepted: 04/02/2019] [Indexed: 06/09/2023]
Abstract
Bacterioplankton communities have a pivotal role in the global carbon cycle. Still the interaction between microbial community and dissolved organic matter (DOM) in freshwater ecosystems remains poorly understood. Here, we report results from a 12-day mesocosm study performed in the epilimnion of a tropical lake, in which inorganic nutrients and allochthonous DOM were supplemented under full light and shading. Although the production of autochthonous DOM triggered by nutrient addition was the dominant driver of changes in bacterial community structure, temporal covariations between DOM optical proxies and bacterial community structure revealed a strong influence of community shifts on DOM fate. Community shifts were coupled to a successional stepwise alteration of the DOM pool, with different fractions being selectively consumed by specific taxa. Typical freshwater clades as Limnohabitans and Sporichthyaceae were associated with consumption of low molecular weight carbon, whereas Gammaproteobacteria and Flavobacteria utilized higher molecular weight carbon, indicating differences in DOM preference among clades. Importantly, Verrucomicrobiaceae were important in the turnover of freshly produced autochthonous DOM, ultimately affecting light availability and dissolved organic carbon concentrations. Our findings suggest that taxonomically defined bacterial assemblages play definite roles when influencing DOM fate, either by changing specific fractions of the DOM pool or by regulating light availability and DOC levels.
Collapse
Affiliation(s)
- Marcelo P Ávila
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
| | - Luciana P M Brandão
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
| | - Ludmila S Brighenti
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
| | - Denise Tonetta
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
| | - Mariana P Reis
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil.
| | - Peter A Stæhr
- Department of Bioscience, Aarhus University, Frederiksborgvej 399, Box 358, 4000 Roskilde, Denmark
| | - Eero Asmala
- Department of Bioscience, Aarhus University, Frederiksborgvej 399, Box 358, 4000 Roskilde, Denmark; Tvärminne Zoological Station, University of Helsinki, J.A. Palménin tie 260, 10900 Hanko, Finland
| | - André M Amado
- Limnology Laboratory, Department of Oceanography and Limnology, Universidade Federal do Rio Grande do Norte, Rio Grande do Norte, Brazil
| | - Francisco A R Barbosa
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
| | - José F Bezerra-Neto
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
| | - Andréa M A Nascimento
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil.
| |
Collapse
|
49
|
Yuan Y, Zhang H, Wei Y, Si Y, Li G, Zhang F. Onsite quantifying electron donating capacity of dissolved organic matter. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 662:57-64. [PMID: 30690379 DOI: 10.1016/j.scitotenv.2019.01.178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 01/07/2019] [Accepted: 01/14/2019] [Indexed: 06/09/2023]
Abstract
Electron donating capacity (EDC) of dissolved organic matter (DOM) impacts the redox behaviors of DOM in surface waters, groundwaters, wetlands, sediments and soils but lacks applicable onsite quantification methods. To address these disadvantages, a simple and portable device with pre-injected [2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonicacid), ABTS·+] was developed that can be used for EDC onsite measurements of DOM in this work. The proposed device and method had better limits of quantification of Trolox (0.2 nmol) and more flexible DOC concentration requirement of 0.5-20 mg L-1 than that of flow injection analysis (FIA) (5-10 mg L-1) or mediated electrochemical oxidation (MEO) (>20 mg L-1). The proposed device and method greatly reduced the preparation and measurement time for sample tests compared to MEO or FIA method, enabling time-efficient EDC determination for large amount of samples. Meanwhile, the proposed device presented comparable accuracy with established MEO method when quantifying the EDCs of 7 standard humic and fulvic acids. Humic acids with higher molecular weight (MW) (<15,000 Da) had higher EDC than that with low MW (<5000 Da). EDCs of DOM in natural and reclaim water samples were both presented significantly positive correlations with their corresponding chemical oxygen demand, chromophoric DOM content, molecular weight and humification of the DOM in water samples. These results suggested that our device could accurately quantify the EDCs of DOM onsite and had promising applications on the fast quality assessment of natural and reclaimed waters.
Collapse
Affiliation(s)
- Ying Yuan
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, China
| | - Hao Zhang
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, China
| | - Yuquan Wei
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, China
| | - Yanxiao Si
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, China
| | - Guanghe Li
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, China
| | - Fang Zhang
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, China.
| |
Collapse
|
50
|
Light Absorption Budget in a Reservoir Cascade System with Widely Differing Optical Properties. WATER 2019. [DOI: 10.3390/w11020229] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Aquatic systems are complex systems due to the environmental pressures that lead to water quality parameter changes, and consequently, variations in optically active compounds (OAC). In cascading reservoir systems, such as the Tietê Cascade Reservoir System (TCSR), which has a length of 1100 km, the horizontal gradients are expressive due to the filtration process that is caused by the sequence of dams affecting the light absorption throughout the cascade. Our new observations showed that colored dissolved organic matter (CDOM) dominate two reservoirs; non-algae particles (NAP) dominate one, and phytoplankton dominates the other. The variability of light absorption along the cascade indicates the influence of watershed dynamics in the reservoirs as much as the flow driven by previous reservoirs. Despite the effect of the variability of light absorption, light absorption by phytoplankton strongly affects the total absorption in the four reservoirs in TCSR. The results obtained in this work may enable a better understanding of how the gradient pattern changes primary production and indicates a challenge in retrieving OAC concentrations using a bio-optical model for an entire cascade composed of different optical environments.
Collapse
|