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Li F, Wei L, Liu Y, Deng H, Cui J, Wang J, Xiao T. Characterization of dissolved organic matter in rivers impacted by acid mine drainage: Components and complexation with metals. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 926:171960. [PMID: 38547981 DOI: 10.1016/j.scitotenv.2024.171960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 03/03/2024] [Accepted: 03/23/2024] [Indexed: 04/05/2024]
Abstract
Dissolved organic matter (DOM), a ubiquitous and active ingredient, is extensively involved in the transformation and migration of environmental pollutants in aquatic ecosystems. However, its chemical composition in acid mine drainage (AMD)-impacted rivers remains poorly characterized, hindering our understanding of its role in the biogeochemistry of key elements in contaminated fluvial environments. Here, we investigated the concentration of dissolved organic carbon (DOC) and spectroscopic and molecular characteristics of DOM in a headwater river contaminated with polymetallic mine-derived AMD in southern China. Terrestrial humic-like (C1) and typically groundwater-supplied aromatic protein/tyrosine-like (C2) substances which were partially from AMD, were identified as the predominant fluorescent components in the river water. Notably, tryptophan-like (C3) substances originating from tailings pond spills were only occasionally detected in the river. Although DOM biogeochemical transformations and degradation occurred in the lateral soil-water riparian interface and longitudinal in-stream transport processes, the molecular compositions identified by FT-ICR MS showed a core set of molecular formulae in the lignin/saturated compound/tannin region of the van Krevelen diagram of the water samples across the rivers. The complexation of DOM with typical metals in AMD was investigated using fluorescence quenching experiments. The results showed that the highest binding ability of Fe(III) to C2 followed by C1, with both detected in the experimental water samples. Mg(II) and Ca(II) strengthened the binding of DOM-Fe(III) when the ferric/DOM ratio was low, while Cu(II) weakened the binding of DOM-Fe(III) due to competition. Ca(II) inhibited the binding of Fe(III) to C1 but promoted the binding of the complex to C2 when both Cu(II) and Mg(II) were present. Since DOM-Fe(III) complexation was associated with the cotransport of AMD-derived metals/metalloids in diverse aqueous environments with multiple co-existing ions (typically Ca(II) input for remediation), our study on the composition of DOM and its complexation with metals can contribute to managing and remediating AMD-impacted rivers.
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Affiliation(s)
- Fangqing Li
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
| | - Lezhang Wei
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; Linköping University-Guangzhou University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou 510006, China.
| | - Yu Liu
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; Linköping University-Guangzhou University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou 510006, China
| | - Hongmei Deng
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
| | - Jinli Cui
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
| | - Jianqiao Wang
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
| | - Tangfu Xiao
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
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2
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Tshering K, Miotlinski K, Blake D, Boyce MC, Bath A, Carvalho A, Horwitz P. Effect of fire on characteristics of dissolved organic matter in forested catchments in the Mediterranean biome: A review. WATER RESEARCH 2023; 230:119490. [PMID: 36580802 DOI: 10.1016/j.watres.2022.119490] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 11/19/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Fires in forested catchments pose a water contamination risk from fire-derived dissolved organic matter (DOM). Fire events are expected to increase under a projection of warmer and drier climatic conditions; therefore, understanding the consequences of fire-derived DOM is critical for water supply and management of drinking water and catchments. This paper addresses how fire regime - the intensity, severity and frequency of fires - influences DOM quantity and composition in surface waters in forested catchments, and how long it takes for water quality to recover to pre-fire levels. A review of post-fire studies in Mediterranean regions reporting on DOM related parameters has been conducted. The literature shows that post-fire DOM composition and reactivity is different from DOM generated under processes of biological degradation, and hence our reliance on DOM 'bulk properties' and surrogate DOM bulk parameters may not provide sufficient information to deal with the potential complexity of the organic compounds produced by a catchment fire. Appropriate measures are important to adequately operate conventional water treatment facilities, for example. Critical parameters for the effects of burning include the alteration of DOM composition, aromaticity, and the relative amounts of labile/recalcitrant organic components. The literature shows mixed information for the influence of both burn severity and fire intensity, on these parameters, which indicates DOM response to fire is highly variable. For fire frequency, the evidence is more unequivocal, indicating that frequent fires change the composition of DOM to components that are less bioavailable, and elevate the degree of aromaticity, which may be detrimental to water quality. In addition, and in general terms, the more recent the fire, the more aromatic and humified DOM components are found, and vice versa. The recovery of surface water quality to pre-fire conditions was variable, with no safe temporal thresholds suggested in the literature. In some cases, fire-induced changes in DOM composition were observable up to 16 years post-fire. The lack of clearly observed trends in post-fire DOM with fire regimes could be attributed to numerous factors such as limited long-term and event-based observations, experimental design challenges, and site-specific biological, physical and hydrological factors. The application of terminologies used to describe fire regimes such as burn severity and fire intensity also creates challenges in comparing the outcomes and results from numerous studies.
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Affiliation(s)
- Kuenzang Tshering
- School of Science, Edith Cowan University, 270 Joondalup Drive, Perth, Australia; Centre for People, Place and Planet, Edith Cowan University, 270 Joondalup Drive, Perth, Australia.
| | - Konrad Miotlinski
- School of Science, Edith Cowan University, 270 Joondalup Drive, Perth, Australia
| | - David Blake
- School of Science, Edith Cowan University, 270 Joondalup Drive, Perth, Australia; Centre for People, Place and Planet, Edith Cowan University, 270 Joondalup Drive, Perth, Australia
| | - Mary C Boyce
- School of Science, Edith Cowan University, 270 Joondalup Drive, Perth, Australia
| | - Andrew Bath
- Water Corporation, 629 Newcastle Street, Leederville, Perth, Australia
| | - Ana Carvalho
- School of Science, Edith Cowan University, 270 Joondalup Drive, Perth, Australia; Centre for People, Place and Planet, Edith Cowan University, 270 Joondalup Drive, Perth, Australia
| | - Pierre Horwitz
- School of Science, Edith Cowan University, 270 Joondalup Drive, Perth, Australia; Centre for People, Place and Planet, Edith Cowan University, 270 Joondalup Drive, Perth, Australia
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Ni M, Li S. Ultraviolet humic-like component contributes to riverine dissolved organic matter biodegradation. J Environ Sci (China) 2023; 124:165-175. [PMID: 36182127 DOI: 10.1016/j.jes.2021.10.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 10/11/2021] [Accepted: 10/11/2021] [Indexed: 06/16/2023]
Abstract
Biological degradation of dissolved organic matter (DOM) regulates its structure and fate in river ecosystems. Previous views suggested that labile components were dominantly consumed by microbial metabolism. Here we provide new observations that a part of recalcitrant compounds largely contribute to riverine DOM biodegradation. The excitation-emission matrix fluorescent spectroscopy combined with peak picking and parallel factor analysis are used to explore component variability during DOM incubation. Humic-like and tryptophan-like DOM are the primary components of riverine DOM, with proportion contributions of 39%-82% and 16%-61% for % of the maximum fluorescence intensity, respectively. After 56 days of aerobic incubation in the dark, large amounts of tyrosine-like DOM generation are observed. Elevated temperature enhances the decomposition of ultraviolet humic-like substance and further stimulates labile DOM bio-mineralization into carbon dioxide. Meanwhile, averaged proportions of amino acid compositions (peak B and T) markedly increase (p < 0.05) as the humic-like compositions (peak A, M and C) decrease after DOM incubation, suggesting incomplete degradation of refractory DOM from high-molecular to low-molecular weight compounds. The findings support the new notion of the continuous DOM biodegradation in a mode as "steps by steps", contributing to a new understanding of carbon cycling for the UN Sustainable Development Goal.
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Affiliation(s)
- Maofei Ni
- College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China; The karst environmental geological hazard prevention laboratory of Guizhou Minzu University, Guiyang 550025, China; Key Laboratory of Reservoir Aquatic Environment, Research Center for Ecohydrology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
| | - Siyue Li
- Research Center for Environmental Ecology and Engineering, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan 430205, China; Key Laboratory of Reservoir Aquatic Environment, Research Center for Ecohydrology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China.
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Granados V, Arias-Real R, Gutiérrez-Cánovas C, Obrador B, Butturini A. Multiple drying aspects shape dissolved organic matter composition in intermittent streams. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 852:158376. [PMID: 36049684 DOI: 10.1016/j.scitotenv.2022.158376] [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: 03/17/2022] [Revised: 08/24/2022] [Accepted: 08/25/2022] [Indexed: 06/15/2023]
Abstract
Water availability is a fundamental driver of biogeochemical processing in highly dynamic ecosystems such as intermittent rivers and ephemeral streams (IRES), which are recognized as the most common fluvial ecosystem globally. Because of their global extent, IRES have a remarkable contribution to organic matter processing, which is expected to intensify as climate change and water extraction expand IRES extension. Nevertheless, the effect of the complexity of the drying process on river biogeochemistry remains unclear. This study investigated how drying aspects affect the dissolved organic carbon (DOC) concentration and composition in 35 streams along a wide flow-intermittence gradient in the NE Iberian Peninsula. To do that, four drying aspects: annual drying duration, annual frequency, duration of the last drying event, and time since the last drying event were characterized. Results showed that DOC concentration and the contribution of humic-like compounds were positively associated with intensifying drying conditions. In addition, protein-like compounds decreased over the drying gradient. More specifically, changes in DOC concentration were driven mainly by annual drying duration, whereas annual drying frequency and the duration of the last drying event jointly explained dissolved organic matter composition. These results suggest that the quantity and composition of dissolved organic matter in streams respond differently to the temporal aspects of the drying process. Our study can help to better anticipate changes in organic matter in the context of climate change.
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Affiliation(s)
- Verónica Granados
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Rebeca Arias-Real
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain; Centre of Molecular and Environmental Biology (CBMA), Department of Biology, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal; Institute of Science and Innovation for Bio-Sustainability (IB-S), University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal.
| | - Cayetano Gutiérrez-Cánovas
- Biological Invasions Group, Department of Integrative Ecology, Doñana Biological Station (EBD-CSIC), Av. Américo Vespucio, 26, Isla de la Cartuja, 41092 Seville, Spain
| | - Biel Obrador
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Andrea Butturini
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
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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.
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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
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Garayburu-Caruso VA, Danczak RE, Stegen JC, Renteria L, Mccall M, Goldman AE, Chu RK, Toyoda J, Resch CT, Torgeson JM, Wells J, Fansler S, Kumar S, Graham EB. Using Community Science to Reveal the Global Chemogeography of River Metabolomes. Metabolites 2020; 10:518. [PMID: 33419380 PMCID: PMC7767024 DOI: 10.3390/metabo10120518] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 12/14/2020] [Accepted: 12/15/2020] [Indexed: 11/16/2022] Open
Abstract
River corridor metabolomes reflect organic matter (OM) processing that drives aquatic biogeochemical cycles. Recent work highlights the power of ultrahigh-resolution mass spectrometry for understanding metabolome composition and river corridor metabolism. However, there have been no studies on the global chemogeography of surface water and sediment metabolomes using ultrahigh-resolution techniques. Here, we describe a community science effort from the Worldwide Hydrobiogeochemistry Observation Network for Dynamic River Systems (WHONDRS) consortium to characterize global metabolomes in surface water and sediment that span multiple stream orders and biomes. We describe the distribution of key aspects of metabolomes including elemental groups, chemical classes, indices, and inferred biochemical transformations. We show that metabolomes significantly differ across surface water and sediment and that surface water metabolomes are more rich and variable. We also use inferred biochemical transformations to identify core metabolic processes shared among surface water and sediment. Finally, we observe significant spatial variation in sediment metabolites between rivers in the eastern and western portions of the contiguous United States. Our work not only provides a basis for understanding global patterns in river corridor biogeochemical cycles but also demonstrates that community science endeavors can enable global research projects that are unfeasible with traditional research models.
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Affiliation(s)
- Vanessa A. Garayburu-Caruso
- Pacific Northwest National Laboratory, Richland, WA 99352, USA; (V.A.G.-C.); (R.E.D.); (J.C.S.); (L.R.); (M.M.); (A.E.G.); (C.T.R.); (J.M.T.); (S.F.); (S.K.)
| | - Robert E. Danczak
- Pacific Northwest National Laboratory, Richland, WA 99352, USA; (V.A.G.-C.); (R.E.D.); (J.C.S.); (L.R.); (M.M.); (A.E.G.); (C.T.R.); (J.M.T.); (S.F.); (S.K.)
| | - James C. Stegen
- Pacific Northwest National Laboratory, Richland, WA 99352, USA; (V.A.G.-C.); (R.E.D.); (J.C.S.); (L.R.); (M.M.); (A.E.G.); (C.T.R.); (J.M.T.); (S.F.); (S.K.)
| | - Lupita Renteria
- Pacific Northwest National Laboratory, Richland, WA 99352, USA; (V.A.G.-C.); (R.E.D.); (J.C.S.); (L.R.); (M.M.); (A.E.G.); (C.T.R.); (J.M.T.); (S.F.); (S.K.)
| | - Marcy Mccall
- Pacific Northwest National Laboratory, Richland, WA 99352, USA; (V.A.G.-C.); (R.E.D.); (J.C.S.); (L.R.); (M.M.); (A.E.G.); (C.T.R.); (J.M.T.); (S.F.); (S.K.)
| | - Amy E. Goldman
- Pacific Northwest National Laboratory, Richland, WA 99352, USA; (V.A.G.-C.); (R.E.D.); (J.C.S.); (L.R.); (M.M.); (A.E.G.); (C.T.R.); (J.M.T.); (S.F.); (S.K.)
| | - Rosalie K. Chu
- Environmental Molecular Sciences Laboratory, Richland, WA 99352, USA; (R.K.C.); (J.T.)
| | - Jason Toyoda
- Environmental Molecular Sciences Laboratory, Richland, WA 99352, USA; (R.K.C.); (J.T.)
| | - Charles T. Resch
- Pacific Northwest National Laboratory, Richland, WA 99352, USA; (V.A.G.-C.); (R.E.D.); (J.C.S.); (L.R.); (M.M.); (A.E.G.); (C.T.R.); (J.M.T.); (S.F.); (S.K.)
| | - Joshua M. Torgeson
- Pacific Northwest National Laboratory, Richland, WA 99352, USA; (V.A.G.-C.); (R.E.D.); (J.C.S.); (L.R.); (M.M.); (A.E.G.); (C.T.R.); (J.M.T.); (S.F.); (S.K.)
| | - Jacqueline Wells
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR 97331, USA;
| | - Sarah Fansler
- Pacific Northwest National Laboratory, Richland, WA 99352, USA; (V.A.G.-C.); (R.E.D.); (J.C.S.); (L.R.); (M.M.); (A.E.G.); (C.T.R.); (J.M.T.); (S.F.); (S.K.)
| | - Swatantar Kumar
- Pacific Northwest National Laboratory, Richland, WA 99352, USA; (V.A.G.-C.); (R.E.D.); (J.C.S.); (L.R.); (M.M.); (A.E.G.); (C.T.R.); (J.M.T.); (S.F.); (S.K.)
| | - Emily B. Graham
- Pacific Northwest National Laboratory, Richland, WA 99352, USA; (V.A.G.-C.); (R.E.D.); (J.C.S.); (L.R.); (M.M.); (A.E.G.); (C.T.R.); (J.M.T.); (S.F.); (S.K.)
- School of Biological Sciences, Washington State University, Pullman, WA 99164, USA
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7
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Maqbool T, Qin Y, Ly QV, Zhang J, Li C, Asif MB, Zhang Z. Exploring the relative changes in dissolved organic matter for assessing the water quality of full-scale drinking water treatment plants using a fluorescence ratio approach. WATER RESEARCH 2020; 183:116125. [PMID: 32650297 DOI: 10.1016/j.watres.2020.116125] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 06/26/2020] [Accepted: 06/27/2020] [Indexed: 06/11/2023]
Abstract
This study aims to extend and demonstrate the application of fluorescence spectroscopy for monitoring the water quality of three differently operated full-scale drinking water treatment plants located in the Shenzhen city (China). A ratio of fluorescent dissolved organic matter (FDOM), which describes relative changes in humic-like to protein-like fluorescence, was used to explain mechanisms behind the physicochemical processes. The fluorescence components obtained through individual and combined parallel factor analysis (PARAFAC) modeling revealed the presence of humic-like (C1) and protein-like (C2) structures in the DOM. The C1/C2 ratio provided a direct relationship between the seasonal variations and DOM composition. Wet season generated DOM enriched with humic-like fluorescence, while dry season caused a higher release of protein-like fluorescence. The fluorescence ratio presented unique patterns of DOM in treatment trains. The chemical pretreatment and disinfection unit processes showed a higher tendency to remove the humic-like fluorescence. However, the C1/C2 ratio increased during physical treatment processes such as coagulation-precipitation and sand filtration, indicating preferential removal of protein-like fluorescence. The DOM composition in influent directly (R2 = 0.77) influenced the relative intensities of fluorescence components in the treated water. Compared to the dry season, the wet season caused significant changes in DOM composition and produced treated water enriched with humic-like fluorescence. This fluorescence ratio offers an approach to explore the role of different treatment units and determine the factors affecting the composition of DOM in the surface water and drinking water treatment plants.
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Affiliation(s)
- Tahir Maqbool
- Institute of Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China; Guangdong Provincial Engineering Research Centre for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing, 100084, China
| | - Yanling Qin
- Institute of Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China; Guangdong Provincial Engineering Research Centre for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing, 100084, China
| | - Quang Viet Ly
- Institute of Research and Development, Duy Tan University, Danang, 550000, Viet Nam
| | - Jiaxing Zhang
- Institute of Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China; Guangdong Provincial Engineering Research Centre for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing, 100084, China
| | - Chengyue Li
- Institute of Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China; Guangdong Provincial Engineering Research Centre for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing, 100084, China
| | - Muhammad Bilal Asif
- Institute of Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China; Guangdong Provincial Engineering Research Centre for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing, 100084, China
| | - Zhenghua Zhang
- Institute of Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China; Guangdong Provincial Engineering Research Centre for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing, 100084, China.
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8
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Influence of Dissolved Organic Matter Sources on In-Stream Net Dissolved Organic Carbon Uptake in a Mediterranean Stream. WATER 2020. [DOI: 10.3390/w12061722] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Studies exploring how different sources of dissolved organic matter (DOM) influence in-stream dissolved organic carbon (DOC) uptake at the ecosystem scale are scarce in the literature. To fill this knowledge gap, we examined the relationship between DOM sources and in-stream net DOC uptake (UDOC) in a sub-humid Mediterranean stream. We considered four reach-scale scenarios occurring under natural conditions that differed in predominant DOM sources (groundwater, leaf litter, and/or upstream water). Results showed that groundwater inputs favored in-stream net DOC uptake, while leaf litter inputs promoted in-stream net DOC release. However, there was no clear effect of DOM source mixing on the magnitude of UDOC. Further, the variability in UDOC within and among scenarios was mostly explained by stream DOC concentration, suggesting that DOC availability limits microbial activity in this stream. DOM composition became a controlling factor of UDOC variability only during the leaf litter period, when stream DOC concentration was the highest. Together, these results suggest that the capacity of headwater forested streams to process DOC is closely tied to the availability of different DOM sources and how they vary over time and along the river network.
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Granados V, Gutiérrez-Cánovas C, Arias-Real R, Obrador B, Harjung A, Butturini A. The interruption of longitudinal hydrological connectivity causes delayed responses in dissolved organic matter. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 713:136619. [PMID: 31958729 DOI: 10.1016/j.scitotenv.2020.136619] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 01/07/2020] [Accepted: 01/08/2020] [Indexed: 06/10/2023]
Abstract
Hydrology is the main driver of dissolved organic matter (DOM) dynamics in intermittent rivers and ephemeral streams. However, it is still unclear how the timing and the spatial variation in flow connectivity affect the dynamics of DOM and inorganic solutes. This study focuses on the impact of flow cessation on the temporal and spatial heterogeneity of DOM quantity and quality along an intermittent stream. We monitored a headwater intermittent stream at high spatial and temporal frequencies during a summer drying episode and analysed dissolved organic carbon (DOC) and its spectroscopic properties, inorganic solutes and dissolved CO2. The drying period determined the disruption of the fluvial continuum with a recession of stream continuum at a rate of ~60 m/d and the gradual formation of a patched system of isolated pools of different sizes. Our results showed that the period of time that had elapsed since isolated pool formation (CI-days) was an essential factor for understanding how drying shaped the biogeochemistry of the fluvial system. Overall, drying caused a high DOC concentration and an increase in the humic-like fluorescence signal. Additionally, solutes showed contrasting responses to hydrological disconnection. Electrical conductivity, for instance, is a clear "sentinel" of the fragmentation process because it starts to increase before the hydrological disruption occurs. In contrast, DOC, most spectroscopic DOM descriptors and CO2 showed delayed responses of approximately 5-21 days after the formation of isolated pools. Furthermore, the spatial location and volume of each isolated pool seemed to exert a significant impact on most variables. In contrast, the temperature did not follow a clear pattern. These findings indicate that the fragmentation of longitudinal hydrological connectivity does not induce a single biogeochemical response but rather stimulates a set of solute-specific responses that generates a complex biogeochemical mosaic in a single fluvial unit.
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Affiliation(s)
- Verónica Granados
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain.
| | - Cayetano Gutiérrez-Cánovas
- Centre of Molecular and Environmental Biology (CBMA), Department of Biology, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal; Institute of Science and Innovation for Bio-Sustainability (IB-S), University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - Rebeca Arias-Real
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Biel Obrador
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Astrid Harjung
- Department of Limnology and Bio-Oceanography, University of Vienna, Vienna, Austria
| | - Andrea Butturini
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
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10
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Ni M, Li S, Santos I, Zhang J, Luo J. Linking riverine partial pressure of carbon dioxide to dissolved organic matter optical properties in a Dry-hot Valley Region. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 704:135353. [PMID: 31812378 DOI: 10.1016/j.scitotenv.2019.135353] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 10/28/2019] [Accepted: 11/01/2019] [Indexed: 06/10/2023]
Abstract
The mineralization of dissolved organic matter (DOM) can partially explain riverine carbon dioxide (CO2) emissions to the atmosphere. However, little is known about how the DOM origin and composition drive CO2 partial pressures (pCO2). Here, we reveal links between aquatic pCO2, DOM optical parameters (a254, a350 and S275-295 and S350-400) and nutrients in a subtropical river in China's Dry-hot Valley Region. Biodegradation preferentially decomposed low molecular weight (LMW) DOMs, increasing high molecular weight (HMW) DOMs along the main stem. pCO2 was positively correlated with aromatic and lignin compounds, but negatively correlated with DOM molecular weight. Aquatic respiration of DOMs largely explained the pCO2 levels in the drought period, while terrestrial inputs were a pCO2 source in the initial-wet period. Our results illustrate how both DOM concentrations and speciation can explain pCO2 distribution and sources in rivers.
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Affiliation(s)
- Maofei Ni
- Key Laboratory of Reservoir Aquatic Environment, Research Center for Ecohydrology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Siyue Li
- Key Laboratory of Reservoir Aquatic Environment, Research Center for Ecohydrology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China.
| | - Isaac Santos
- National Marine Science Centre, Southern Cross University, PO Box 4321, Coffs Harbour, New South Wales 2450, Australia
| | - Jing Zhang
- Key Laboratory of Reservoir Aquatic Environment, Research Center for Ecohydrology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; College of Resources and Environment, Southwest University, Chongqing 400716, China
| | - Jiachen Luo
- Key Laboratory of Reservoir Aquatic Environment, Research Center for Ecohydrology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; University of Chinese Academy of Sciences, Beijing 100049, China
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11
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Bhattacharya R, Osburn CL. Spatial patterns in dissolved organic matter composition controlled by watershed characteristics in a coastal river network: The Neuse River Basin, USA. WATER RESEARCH 2020; 169:115248. [PMID: 31706125 DOI: 10.1016/j.watres.2019.115248] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Revised: 10/25/2019] [Accepted: 10/26/2019] [Indexed: 06/10/2023]
Abstract
The effect of watershed characteristics (land use land cover and morphology) on spatial variability in dissolved organic matter (DOM) composition, and concentrations of dissolved organic carbon [DOC] and nitrogen [DON] was assessed in a coastal river basin draining into Pamlico Sound in eastern North Carolina, USA. Understanding the factors that influence DOM concentration and composition i.e., structurally complex molecules with high molecular weight versus low molecular weight, simple molecules can provide insights on DOM cycling and water composition implications. Such information is imperative for large coastal river networks undergoing rapid and intense land use and land cover (LULC) changes. DOM composition was estimated using optical indices calculated from DOM absorbance and fluorescence measurements. DOM was derived from terrestrial sources, and ordination analysis indicated that LULC, in particular, % wetland area was the most significant control on DOM composition and concentration. Wetland and agricultural coastal streams were abundant in humic and complex DOM, whereas forested and urban streams were least abundant in humic DOM. We speculate that greater availability of mobilizable DOM in wetland and agricultural watersheds contributed to this observation. In comparison, mixed urbanized and forested streams in North Carolina's Piedmont region were abundant in [DOC], less complex, low molecular weight DOM, as well as greater amounts [DON] due to higher urban runoff and elevated DOM production in these streams. Our results indicated that physiographic transition from Piedmont to coastal plain and varying LULC influenced the spatial variability in DOM composition and concentration. Our findings highlight that increasing anthropogenic alterations might increase the abundance of reactive DOM in coastal rivers and estuaries resulting in severe water quality issues. This information is important for monitoring and developing land use policies.
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Affiliation(s)
- Ruchi Bhattacharya
- School of Natural Resources, University of Missouri, Columbia, MO, USA; Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC, USA.
| | - Christopher L Osburn
- Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC, USA
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12
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Shen J, Liu B, Wu J, Chai Y, Cheng C, Liu C, Yan R, Saleem Khan MF. Characterization of fluorescent dissolved organic matters in metalworking fluid by fluorescence excitation-emission matrix and high-performance liquid chromatography. CHEMOSPHERE 2020; 239:124703. [PMID: 31526999 DOI: 10.1016/j.chemosphere.2019.124703] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 08/22/2019] [Accepted: 08/27/2019] [Indexed: 06/10/2023]
Abstract
In recent years, precise environment supervision has gradually become vital in water pollution control, which requires the clear identification of dissolved organic matters (DOM) in wastewater. Metalworking fluid (MWF) is a type of wastewater with high toxicity. Over ten million m3 of MWF is discharged per year. However, its DOM characteristics have not yet been systematically investigated. Therefore, in this study, the fluorescent DOM (FDOM) of MWF was firstly characterized by excitation-emission matrix-parallel factor analysis (EEM-PARAFAC) and high-performance liquid chromatography (HPLC). Three fluorescent components (C1-C3) of the MWF from three metalworking plants (BO, TH, and YD) were identified. The peaks measured for C1 and C3 were attributed to tryptophan-like (Peak T) and humic/fulvic acid-like (Peak A + C) peaks, respectively, and the peaks at C2 were identified as humic-like (Peak A + M) or tryptophan-like (Peak T) peaks. There were differences in the C2 and C3 components of MWF from the three metalworking plants. The FDOM of MWF from the three metalworking plants exhibited similar polarity, but different apparent molecular weight distributions. In addition, the highest intensities of the three fluorescent peaks were sensitive to variations in the pH, humic acid (HA) concentrations, and metal ion levels (Cu2+, Fe3+, and Ni2+). The findings of this study not only indicate the FDOM characteristics of MWF, but also provide a promising method and valuable guidance for the practical monitoring of MWF in natural water bodies.
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Affiliation(s)
- Jian Shen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China; Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215000, China
| | - Bo Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China; Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215000, China
| | - Jing Wu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China; Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215000, China.
| | - Yidi Chai
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China; Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215000, China
| | - Cheng Cheng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China; Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215000, China
| | - Chuanyang Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China; Research Institute for Environmental Innovation (Suzhou) Tsinghua, Suzhou, 215000, China
| | - Rui Yan
- R & D Centre, Gaobeidian WWTP, Beijing, 100124, China
| | - Muhammad Farooq Saleem Khan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China; School of Physical Science and Technology, Soochow University, Suzhou, 215006, China
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13
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Kamjunke N, Hertkorn N, Harir M, Schmitt-Kopplin P, Griebler C, Brauns M, von Tümpling W, Weitere M, Herzsprung P. Molecular change of dissolved organic matter and patterns of bacterial activity in a stream along a land-use gradient. WATER RESEARCH 2019; 164:114919. [PMID: 31382154 DOI: 10.1016/j.watres.2019.114919] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 07/23/2019] [Accepted: 07/26/2019] [Indexed: 06/10/2023]
Abstract
Fluvial networks are globally relevant for the processing of dissolved organic matter (DOM). To investigate the change in molecular DOM diversity along the river course, high-field FTICR mass spectrometry and NMR spectroscopy of riverine DOM as well as bacterial abundance and activity were measured in a third order stream along a land-use gradient from pristine, agricultural to urban landscapes. DOM composition showed a clear evolution along the river course with an initial decrease of average oxidation and unsaturation followed by an increased relative abundance of CHNO and CHOS compounds introduced by agriculture and waste water, respectively. DOM composition was dominated by rather unsaturated CHO compounds (H/C ≤ 1) in headwaters and by more aliphatic molecules at downstream sites. Oxygenated functional groups shifted from aromatic ethers and hydroxyl groups to aliphatic carboxylic acids and aliphatic hydroxyl groups. This massive dislocation of oxygen significantly increased the diversity of atomic environments in branched aliphatic groups from headwater to downstream DOM. Mass spectra of DOM enabled the detection of compositional relationships to bacterial abundance and activity which was positively related to more aliphatic components (H/C > 1) and negatively related to unsaturated components. FTICR mass and NMR spectra corroborated the initial decline in DOM molecular diversity predicted by the River Continuum Concept (RCC) but demonstrated an anthropogenic increase in the molecular diversity of DOM further downstream. While the high DOM molecular diversity in first order headwater streams was the result of small scale ecosystem plurality, agriculture and waste water treatment introduced many components in the lower reaches. These anthropogenic influences together with massive bacterial oxidation of DOM contributed to a growth of molecular diversity of downstream DOM whose composition and structure differed entirely from those found in pristine headwaters.
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Affiliation(s)
- Norbert Kamjunke
- Helmholtz-Centre for Environmental Research - UFZ, Department of River Ecology, Brückstraße 3a, D-39114, Magdeburg, Germany.
| | - Norbert Hertkorn
- Helmholtz-Centre Munich, German Research Center for Environmental Health, Research Unit Analytical Biogeochemistry (BGC), Ingolstädter Landstraße 1, P. O. Box 1129, D-85758 Neuherberg, Germany
| | - Mourad Harir
- Helmholtz-Centre Munich, German Research Center for Environmental Health, Research Unit Analytical Biogeochemistry (BGC), Ingolstädter Landstraße 1, P. O. Box 1129, D-85758 Neuherberg, Germany; Technical University Munich, Chair Analytical Food Chemistry, Maximus-von-Imhof-Forum 2, D-85354, Freising Weihenstephan, Germany
| | - Philippe Schmitt-Kopplin
- Helmholtz-Centre Munich, German Research Center for Environmental Health, Research Unit Analytical Biogeochemistry (BGC), Ingolstädter Landstraße 1, P. O. Box 1129, D-85758 Neuherberg, Germany; Technical University Munich, Chair Analytical Food Chemistry, Maximus-von-Imhof-Forum 2, D-85354, Freising Weihenstephan, Germany
| | - Christian Griebler
- Helmholtz-Centre Munich, German Research Center for Environmental Health, Institute of Groundwater Hydrology (IGOE), Ingolstädter Landstraße 1, P. O. Box 1129, D-85758, Neuherberg, Germany; Present Address: University of Vienna, Department of Limnology & Bio-Oceanography, Althanstrasse 14, 1090, Vienna, Austria
| | - Mario Brauns
- Helmholtz-Centre for Environmental Research - UFZ, Department of River Ecology, Brückstraße 3a, D-39114, Magdeburg, Germany
| | - Wolf von Tümpling
- Helmholtz-Centre for Environmental Research - UFZ, Department of River Ecology, Brückstraße 3a, D-39114, Magdeburg, Germany
| | - Markus Weitere
- Helmholtz-Centre for Environmental Research - UFZ, Department of River Ecology, Brückstraße 3a, D-39114, Magdeburg, Germany
| | - Peter Herzsprung
- Helmholtz-Centre for Environmental Research - UFZ, Department of Lake Research, Brückstraße 3a, D-39114, Magdeburg, Germany
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14
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Liu J, Jiang T, Kothawala DN, Wang Q, Zhao Z, Wang D, Mu Z, Zhang J. Rice-paddy field acts as a buffer system to decrease the terrestrial characteristics of dissolved organic matter exported from a typical small agricultural watershed in the Three Gorges Reservoir Area, China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:23873-23885. [PMID: 31218583 DOI: 10.1007/s11356-019-05702-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2019] [Accepted: 06/06/2019] [Indexed: 06/09/2023]
Abstract
Agricultural watersheds are a crucial contributor of terrestrial dissolved organic matter (DOM) for the adjacent aquatic environment. Recently, ecological engineering of the buffer zone such as a rice-paddy field was established to reduce the export of nutrients and contaminants from a small agricultural watershed. However, the potential of the rice-paddy field to reduce the terrestrial signature of DOM is unclear. Therefore, two small agricultural sub-catchments (i.e., sub-1 and sub-2) with different land uses and hill slope angles in the Three Gorges Reservoir (TGR) area of China were studied from 2014 to 2015. The results showed that the terrestrial DOM signals are indicated by optical indices (SUVA254, SR, fluorescence index) in the steeper and more forest covered, but rice-paddy field buffered sub-catchment (i.e., sub-2) decreased significantly, as compared to the reference sub-catchment (i.e., sub-1). Regardless of seasonal variations, the rice-paddy field retained a buffering role to reduce the terrestrial property of DOM and the highest capacity was observed during the rice-growth period. However, during storm events, the differences of DOM properties for two sub-catchments were not significant, because the buffer system was weakened. Finally, environmental implications of the role of such a buffer zone in the TGR areas are discussed. These results demonstrate that rice-paddy fields are successful in mitigating the terrestrial property of exported DOM, but the weaker performance during storm events still needs to be considered.
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Affiliation(s)
- Jiang Liu
- Department of Environmental Science and Engineering, College of Resources and Environment, Southwest University, Chongqing, 400715, China
| | - Tao Jiang
- Department of Environmental Science and Engineering, College of Resources and Environment, Southwest University, Chongqing, 400715, China.
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-90183, Umeå, Sweden.
| | - Dolly N Kothawala
- Department of Limnology, Department of Ecology and Genetics, Uppsala University, SE-75236, Uppsala, Sweden
| | - Qilei Wang
- Department of Environmental Science and Engineering, College of Resources and Environment, Southwest University, Chongqing, 400715, China
| | - Zheng Zhao
- Department of Environmental Science and Engineering, College of Resources and Environment, Southwest University, Chongqing, 400715, China
- Environmental Monitoring Central Station of Guizhou Province, Guiyang, 550081, China
| | - Dingyong Wang
- Department of Environmental Science and Engineering, College of Resources and Environment, Southwest University, Chongqing, 400715, China
| | - Zhijian Mu
- Department of Environmental Science and Engineering, College of Resources and Environment, Southwest University, Chongqing, 400715, China
| | - Jinzhong Zhang
- Department of Environmental Science and Engineering, College of Resources and Environment, Southwest University, Chongqing, 400715, China
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15
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Rossi F, Mallet C, Portelli C, Donnadieu F, Bonnemoy F, Artigas J. Stimulation or inhibition: Leaf microbial decomposition in streams subjected to complex chemical contamination. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 648:1371-1383. [PMID: 30340282 DOI: 10.1016/j.scitotenv.2018.08.197] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 08/14/2018] [Accepted: 08/15/2018] [Indexed: 06/08/2023]
Abstract
Leaf litter decomposition is a key mechanism in headwater streams, allowing the transfer of nutrients and energy into the entire food web. However, chemical contamination resulting from human activity may exert a high pressure on the process, possibly threatening the structure of heterotrophic microbial communities and their decomposition abilities. In this study, the rates of microbial Alnus glutinosa (Alnus) leaf decay were assessed in six French watersheds displaying different land use (agricultural, urbanized, forested) and over four seasons (spring, summer, autumn, winter). In addition, for each watershed at each sampling time, both upstream (less-contaminated) and downstream (more-contaminated) sections were monitored. Toxicities (estimated as toxic units) predicted separately for pesticides and pharmaceuticals as well as environmental parameters (including nutrient levels) were related to microbial decay rates corrected for temperature and a range of fungal and bacterial community endpoints, including biomass, structure, and activity (extracellular ligninolytic and cellulolytic enzymatic activities). Results showed that agricultural and urbanized watersheds were more contaminated for nutrients and xenobiotics (higher pesticides and pharmaceuticals predicted toxicity) than forested watersheds. However, Alnus decay rates were higher in agricultural and urbanized watersheds, suggesting compensatory effects of nutrients over xenobiotics. Conversely, fungal biomass in leaves was 2-fold and 1.4-fold smaller in urbanized and agricultural watersheds than in the forested watersheds, respectively, which was mostly related to pesticide toxicity. However, no clear pattern was observed for extracellular enzymatic activities except that β-glucosidase activity positively correlated with Alnus decay rates. Together, these results highlight microbial communities being more efficient for leaf decomposition in polluted watersheds than in less contaminated ones, which is probably explained by changes in microbial community structure. Overall, our study showed that realistic chemical contamination in stream ecosystems may affect the biomass of Alnus-associated microbial communities but that these communities can adapt themselves to xenobiotics and maintain ecosystem functions.
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Affiliation(s)
- Florent Rossi
- Université Clermont-Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France.
| | - Clarisse Mallet
- Université Clermont-Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France
| | - Christophe Portelli
- Université Clermont-Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France
| | - Florence Donnadieu
- Université Clermont-Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France
| | - Frédérique Bonnemoy
- Université Clermont-Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France
| | - Joan Artigas
- Université Clermont-Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France
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16
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Yeh TC, Liao CS, Chen TC, Shih YT, Huang JC, Zehetner F, Hein T. Differences in N loading affect DOM dynamics during typhoon events in a forested mountainous catchment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 633:81-92. [PMID: 29573694 PMCID: PMC6520230 DOI: 10.1016/j.scitotenv.2018.03.177] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 03/16/2018] [Accepted: 03/16/2018] [Indexed: 05/15/2023]
Abstract
The dissolved organic matter (DOM) and nutrient dynamics in small mountainous rivers (SMRs) strongly depend on hydrologic conditions, and especially on extreme events. Here, we investigated the quantity and quality of DOM and inorganic nutrients during base-flow and typhoon events, in a chronically N-saturated mainstream and low N-loaded tributaries of a forested small mountainous reservoir catchment in Taiwan. Our results suggest that divergent transport mechanisms were triggered in the mainstream vs. tributaries during typhoons. The mainstream DON increased from 3.4 to 34.7% of the TDN pool with a static DOC:NO3-N ratio and enhanced DOM freshness, signalling a N-enriched DOM transport. Conversely, DON decreased from 46 to 6% of the TDN pool in the tributaries and was coupled with a rapid increase of the DOC:NO3-N ratio and humified DOM signals, suggesting the DON and DOC were passively and simultaneously transported. This study confirmed hydrology and spatial dimensions being the main drivers shaping the composition and concentration of DOM and inorganic nutrients in small mountainous catchments subject to hydrologic extremes. We highlighted that the dominant flow paths largely controlled the N-saturation status and DOM composition within each sub-catchment, the effect of land-use could therefore be obscured. Furthermore, N-saturation status and DOM composition are not only a result of hydrologic dynamics, but potential agents modifying the transport mechanism of solutes export from fluvial systems. We emphasize the importance of viewing elemental dynamics from the perspective of a terrestrial-aquatic continuum; and of taking hydrologic phases and individual catchment characteristics into account in water quality management.
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Affiliation(s)
- Tz-Ching Yeh
- Institute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences (BOKU), Vienna, Austria; WasserCluster Lunz (WCL), Inter-university Research Institute, Lunz am See, Austria
| | - Chien-Sen Liao
- Department of Civil and Ecological Engineering, I-Shou University, Kaohsiung, Taiwan
| | - Ting-Chien Chen
- Department of Environmental Science and Engineering, National Pingtung University of Science and Technology (NPUST), Pingtung, Taiwan
| | - Yu-Ting Shih
- Department of Geography, National Taiwan University (NTU), Taipei, Taiwan
| | - Jr-Chuan Huang
- Department of Geography, National Taiwan University (NTU), Taipei, Taiwan
| | - Franz Zehetner
- Institute of Soil Research, University of Natural Resources and Life Sciences (BOKU), Vienna, Austria
| | - Thomas Hein
- Institute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences (BOKU), Vienna, Austria; WasserCluster Lunz (WCL), Inter-university Research Institute, Lunz am See, Austria.
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