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Zhang X, Yu K, Li M, Jiang H, Gao W, Zhao J, Li K. Diatom-dinoflagellate succession in the Bohai Sea: The role of N/P ratios and dissolved organic nitrogen components. WATER RESEARCH 2024; 251:121150. [PMID: 38246079 DOI: 10.1016/j.watres.2024.121150] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 01/04/2024] [Accepted: 01/15/2024] [Indexed: 01/23/2024]
Abstract
Dissolved organic nitrogen (DON) is a pivotal component of total dissolved nitrogen pools, serving as a crucial nitrogen source for phytoplankton. This study investigated the impact of nitrogen-to-phosphorus (N/P) ratios and different DON components (hydrophilic vs hydrophobic DON) on diatom-dinoflagellate succession through field culture experiments. Results showed that dinoflagellates have a competitive advantage under high N/P ratios and phosphorus limitation, regardless of DON or DIN treatments. Hydrophilic DON exhibits greater bioavailability than hydrophobic DON (40.6% vs. 21.7 %), resulting in increased algal biomass and diatoms dominance in the community. Additionally, DON was categorized into labile and refractory components (LDON and RDON) based on bioavailability. LDON primarily consists of protein-like components that can be readily consumed by algae, whereas RDON is primarily composed of humic-like components that are less accessible to algae. Diatoms and dinoflagellates exhibited differential responses to LDON and RDON, with diatoms thriving in high LDON environments, while dinoflagellates gained a competitive advantage when RDON was the predominant nitrogen source. Furthermore, a significant negative correlation was observed between bioavailable nitrogen concentration (BAN: DIN + LDON) and the ratio of dinoflagellates to diatoms (p<0.05). In conclusion, our study highlights the role of LDON in promoting diatom dominance, whereas environments dominated by RDON foster dinoflagellate success. These findings enhance our comprehension of diatom-dinoflagellate succession dynamics.
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Affiliation(s)
- Xiansheng Zhang
- Key Laboratory of Marine Chemistry Theory and Technology, and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China
| | - Kunlong Yu
- Key Laboratory of Marine Chemistry Theory and Technology, and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China
| | - Min Li
- Key Laboratory of Marine Chemistry Theory and Technology, and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China
| | - Heng Jiang
- Key Laboratory of Marine Chemistry Theory and Technology, and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China
| | - Weimin Gao
- Key Laboratory of Marine Chemistry Theory and Technology, and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China
| | - Jing Zhao
- Key Laboratory of Marine Chemistry Theory and Technology, and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao 266100, China
| | - Keqiang Li
- Key Laboratory of Marine Chemistry Theory and Technology, and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China.
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2
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Yang Y, Li K, Liang S, Lin G, Liu C, Li J, Xie L, Li Y, Wang X. A simulation-optimization approach based on the compound eutrophication index to identify multi-nutrient allocated load. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 906:167626. [PMID: 37804968 DOI: 10.1016/j.scitotenv.2023.167626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 10/04/2023] [Accepted: 10/04/2023] [Indexed: 10/09/2023]
Abstract
Eutrophication with nutrient enrichment is a global marine ecosystem concern that threatens human health, economic activities, and ecosystem functions. Therefore, a nutrient load optimization method is required to help control marine eutrophication. However, eutrophication-based nutrient allocated load optimization is a multi-objective project due to a series of eutrophication pressures, such as cross-regional land-based nutrient loads and multi-nutrient regimes and ratios. In this study, a synergistic multi-nutrient control method was developed for the Bohai Sea (BS), China, which links multi-nutrient pressures with eutrophication states. Based on the eutrophication control standard, which is the second level of compound eutrophication index (CEI), the total maximum allocated loads (CEI-based TMALs) of total dissolved nitrogen (TDN), total dissolved phosphorus (TDP), and the chemical oxygen demand (COD) were calculated by a simulation-optimization approach. Using the end year of China's 13th Five-Year Plan (2020) as the reference year, 154 high load pressure jurisdictions (HLPJs) that contribute to eutrophication response segments in the BS were identified. Accordingly, practiced the optimized annual reduction rates of TDN, TDP, and COD in the HLPJs at 15 %, 11 %, and 2 % according to CEIII, respectively, the proportion of eutrophicated areas gradually decreased from 32 % in 2020 to 15 % in 2025 and might be 0 % in 2035 with ecosystem resilience in 2035. In particular, under the annual reduction rates of TDN and TDP optimized based on CEIII, the DIN/DIP molar ratio in the BS decreased to 16:1 by 2035. The simulation-optimization approach associated with the CEI-based TMALs for multi-nutrient control in this study might make implementing land-sea coordination more efficiency and marine nutrient regime stably. This can provide scientific and technological support for improving the health of coastal ecosystems.
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Affiliation(s)
- Yanqun 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; Frontiers Science Center for Deep Ocean Multispheres and Earth System, Qingdao 266100, China
| | - Keqiang Li
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Frontiers Science Center for Deep Ocean Multispheres and Earth System, Qingdao 266100, China.
| | - Shengkang Liang
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Frontiers Science Center for Deep Ocean Multispheres and Earth System, Qingdao 266100, China
| | - Guohong Lin
- Material Science and Engineering College, Qingdao University, Qingdao 266061, China
| | - Cheng Liu
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Frontiers Science Center for Deep Ocean Multispheres and Earth System, Qingdao 266100, China
| | - Jixin Li
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Frontiers Science Center for Deep Ocean Multispheres and Earth System, Qingdao 266100, China
| | - Linping Xie
- Key Laboratory of Marine Eco-Environmental Science and Technology, First Institute of Oceanography, MNR, Qingdao, China
| | - Yanbin Li
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Frontiers Science Center for Deep Ocean Multispheres and Earth System, Qingdao 266100, China
| | - Xiulin Wang
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Frontiers Science Center for Deep Ocean Multispheres and Earth System, Qingdao 266100, China
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3
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Yan Z, Xin Y, Zhong X, Yi Y, Li P, Wang Y, Zhou Y, Zhou Y, He C, Shi Q, He D. Dissolved organic nitrogen cycling revealed at the molecular level in the Bohai and Yellow Sea. WATER RESEARCH 2023; 244:120446. [PMID: 37572459 DOI: 10.1016/j.watres.2023.120446] [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: 02/17/2023] [Revised: 07/03/2023] [Accepted: 08/03/2023] [Indexed: 08/14/2023]
Abstract
Marginal seas play a crucial role in the cycling of dissolved organic nitrogen (DON) between the terrestrial and marine environments. However, very few studies have considered the molecular transformation of DON in marginal seas, leaving the DON molecular modifications in its cycling largely unknown. Therefore, this study examined DON cycling in the Bohai Sea and Yellow Sea, two semi-closed marginal seas in northern China, using stable isotopes (δ15N and δ13C), optical characteristics, and molecular compositions. Compared to the Yellow Sea, the Bohai Sea had a weaker exchange with the open ocean, resulting in higher concentrations, lower δ15N, and more recalcitrant properties in DON. The DON cycling showed significant differences inside and outside the Yellow Sea Cold Water (YSCW). Degradation was the major sink of DON in the YSCW, during which more highly unsaturated compounds and carboxyl-rich alicyclic molecules were produced. Nitrogen atoms were found to be removed from the molecules with more N atoms to those with fewer ones during the DON degradation. This study discovered the molecular modifications in DON cycling and highlighted the intrinsic mechanisms in the cycling of DON in marginal seas.
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Affiliation(s)
- Zhenwei Yan
- Department of Ocean Science and Center for Ocean Research in Hong Kong and Macau, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China; Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Institute for Advanced Ocean Study, Ocean University of China, Qingdao, Shandong, China
| | - Yu Xin
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Institute for Advanced Ocean Study, Ocean University of China, Qingdao, Shandong, China.
| | - Xiaosong Zhong
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Institute for Advanced Ocean Study, Ocean University of China, Qingdao, Shandong, China; Research Center for Marine Ecology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China
| | - Yuanbi Yi
- Department of Ocean Science and Center for Ocean Research in Hong Kong and Macau, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - Penghui Li
- School of Marine Sciences, Sun Yat-Sen University, Zhuhai, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China; Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Zhuhai, China
| | - Yuntao Wang
- State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China
| | - Yuping Zhou
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, China
| | - Youping Zhou
- Isotopomics in Chemical & Biological Oceanography (ICBO), Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China
| | - Chen He
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, China
| | - Quan Shi
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, China
| | - Ding He
- Department of Ocean Science and Center for Ocean Research in Hong Kong and Macau, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China; State Key Laboratory of Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
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Zhang X, Zhen G, Cui X, Zeng Y, Gao W, Yu K, Li K. Effect of dissolved organic nutrients on the bloom of Prorocentrum donghaiense in the East China Sea coastal waters. MARINE ENVIRONMENTAL RESEARCH 2023; 183:105841. [PMID: 36512865 DOI: 10.1016/j.marenvres.2022.105841] [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: 11/11/2022] [Revised: 11/27/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
Prorocentrum donghaiense blooms occur annually in the East China Sea coastal waters, degrading ecosystem functions and impeding economic development. Dissolved organic nitrogen and phosphorus (DON and DOP) are the main components in the marine nutrient pools and are closely related to harmful algal blooms. From April to June 2019, a survey was conducted along the East China Sea coast (Sansha and Lianjiang counties) to investigate the relationship between dissolved organic nutrients and P. donghaiense bloom. Our findings showed that dinoflagellates dominated the phytoplankton community, and dissolved organic nutrients were the major factors influencing community structure during the P. donghaiense bloom. Redundancy analysis indicated that P. donghaiense abundance was primarily affected by DON in the Sansha area while it was primarily affected by DON and DOP in the Lianjiang area. Correlation analysis also confirmed a strong positive correlation between dissolved organic nutrients and P. donghaiense abundance both in the Sansha and Lianjiang coastal areas (p < 0.001). Furthermore, a culture experiment was carried out during the bloom to further investigate the effect of dissolved organic nutrients on the phytoplankton community structure. After 10 days of culture, dinoflagellates' relative abundance decreased from 97.1% to 28.2% in the inorganic treatment, whereas dinoflagellates continued to dominate the phytoplankton community in the organic treatment (76.9%). As a result, we propose that dissolved organic nutrients are responsible for the P. donghaiense bloom outbreak and promote the phytoplankton community shift from diatoms to dinoflagellates.
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Affiliation(s)
- Xiansheng Zhang
- Key Laboratory of Marine Chemistry Theory and Technology, And Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, 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; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 2066061, China
| | - Guangming Zhen
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 2066061, China
| | - Xiaoru Cui
- Key Laboratory of Marine Chemistry Theory and Technology, And Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China
| | - Yulan Zeng
- College of Agriculture & Biotechnology, Zhejiang University, Hangzhou, 310058, China; Key Laboratory of Marine Ecosystem Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, 310012, China
| | - Weimin Gao
- Key Laboratory of Marine Chemistry Theory and Technology, And Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 2066061, China
| | - Kunlong Yu
- Key Laboratory of Marine Chemistry Theory and Technology, And Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 2066061, China
| | - Keqiang Li
- Key Laboratory of Marine Chemistry Theory and Technology, And Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, 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; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 2066061, China.
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5
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Zhang X, Chen S, Han X, Su R, Zhang C, Liang S, Yang R, Wang X, Li K. Effects of organic nitrogen components from terrestrial input on the phytoplankton community in Jiaozhou Bay. MARINE POLLUTION BULLETIN 2022; 174:113316. [PMID: 35090298 DOI: 10.1016/j.marpolbul.2021.113316] [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: 11/01/2021] [Revised: 12/17/2021] [Accepted: 12/29/2021] [Indexed: 06/14/2023]
Abstract
Dissolved organic nitrogen (DON) from terrestrial input exacerbates eutrophication and induces harmful algal blooms. We investigated the effects of hydrophilic (Hic) and low molecular weight (LMW) DON on the phytoplankton community in Jiaozhou Bay during autumn (October 2017) and spring (May 2018). Our results showed DON additions significantly increased algal growth while decreasing community biodiversity and provide a competitive advantage for Skeletonema costatum. These situations were further intensified by increasing temperature in autumn. Additionally, Hic DON had a higher bioavailability than LMW DON. Based on emission-excitation matrix spectra, we identified protein-like components as the main components of Hic DON whereas humus-like components were the principal components of LMW. Correlation analysis confirmed a positive correlation between DON bioavailability and protein-like components. Therefore, our results indicate DON from terrestrial input disrupts the structural stability of the phytoplankton community and increases the risk of harmful algal blooms, which in turn threaten coastal ecosystems.
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Affiliation(s)
- Xiansheng Zhang
- Key Laboratory of Marine Chemistry Theory and Technology, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China
| | - Shanqiao Chen
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China
| | - Xiurong Han
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China
| | - Rongguo Su
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China
| | - Chuansong Zhang
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China.
| | - Shengkang Liang
- Key Laboratory of Marine Chemistry Theory and Technology, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao 266100, China
| | - Rui Yang
- Key Laboratory of Marine Chemistry Theory and Technology, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China
| | - Xiulin Wang
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China
| | - Keqiang Li
- Key Laboratory of Marine Chemistry Theory and Technology, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 2066061, China.
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Yang R, Chen S, Zhang X, Su R, Zhang C, Liang S, Han X, Wang X, Li K. Influences of the hydrophilic components of two anthropogenic dissolved organic nitrogen groups on phytoplankton growth in Jiaozhou Bay, China. MARINE POLLUTION BULLETIN 2021; 169:112551. [PMID: 34119960 DOI: 10.1016/j.marpolbul.2021.112551] [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: 03/03/2021] [Revised: 05/21/2021] [Accepted: 05/22/2021] [Indexed: 06/12/2023]
Abstract
Increasing human activities have caused the accumulation of dissolved organic nitrogen (DON) in the ocean, which can alter dominant coastal phytoplankton species. However, insights into DON's effects on marine phytoplankton growth are insufficient compared with those of dissolved inorganic nitrogen (DIN), especially regarding the role of specific DON components. Therefore, in this study, the effects of the hydrophilic (Hic) and low molecular weight (LMW) components of two anthropogenic DON sources on the growth and bioavailable nitrogen uptake of phytoplankton were studied using in situ cultural experiments conducted in Jiaozhou Bay, China. Animal-derived DON from domestic and livestock breeding showed a higher bioavailability compared with that of vegetal DON derived from agricultural sources, with bioavailable component proportions of 76% ± 4% and 66% ± 3%, respectively. Both forms of DON could be absorbed by Skeletonema costatum, stimulating it to become the dominant species in the mesocosm ecosystem; the hydrophilic components of DON contributed approximately 75% of the uptake of DON by S. costatum. The bioavailability of LMW DON was significantly (p < 0.05) lower than that of the Hic DON. The high bioavailability of the Hic DON was mainly associated with its protein-like T1 and T2 components, identified using parallel factor analysis on the excitation-emission-matrix spectra, while the low bioavailability of LMW DON was mainly associated with the humus-like A component. The protein-like T2 components may be directly absorbed by algae, while T1 may be transformed through mineralization and algal absorption. Understanding the impacts of anthropogenic DON and its components on phytoplankton will help improve coastal environmental management. More knowledge of the effect of anthropogenic DON on the phytoplankton community structure in coastal waters should be accumulated in the future.
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Affiliation(s)
- Rui Yang
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Shanqiao Chen
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Xiansheng Zhang
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Rongguo Su
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Chuansong Zhang
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Shengkang Liang
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
| | - Xiurong Han
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Xiulin Wang
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Keqiang Li
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, 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.
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Fang TH, Chen WH. Dissolved and particulate nitrogen species partitioning and distribution in the Danshuei River estuary, northern Taiwan. MARINE POLLUTION BULLETIN 2021; 164:111981. [PMID: 33482500 DOI: 10.1016/j.marpolbul.2021.111981] [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: 04/20/2020] [Revised: 12/18/2020] [Accepted: 12/20/2020] [Indexed: 06/12/2023]
Abstract
Danshuei River Estuary (DRE) total and inorganic nitrogen in the dissolved (TDN, DIN) and particulate (TPN, PIN) phases were analyzed to study their distribution and partitioning. The carbon contents in particles were also analyzed. The upper estuary contained higher ammonium concentration (304-557 μM), leading to TDN completely dominating (>95%) the total N (TDN + TPN) pool within the DRE. Ammonium played a crucial role in controlling the speciation variation of DIN and partitioning between dissolved and particulate phases. Nitrification seemed to occur in the salinity >30 region where elevated percentages of nitrite and nitrate were observed. PON dominated the particulate N and contributed an average of 62% of the TPN pool. A constant organic C/N ratio (6.55) was observed in particles, indicating that POM was mainly from phytoplankton detritus. The N distribution coefficient values, log(KD), ranged from 3 to 4, suggesting that the affinity of DIN for particles was weak.
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Affiliation(s)
- Tien Hsi Fang
- Department of Marine Environmental Informatics, National Taiwan Ocean University, Keelung 202, Taiwan.
| | - Wei Hsiang Chen
- Department of Marine Environmental Informatics, National Taiwan Ocean University, Keelung 202, Taiwan
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8
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Chen Q, Fan J, Ming H, Su J, Wang Y, Wang B. Effects of environmental factors on denitrifying bacteria and functional genes in sediments of Bohai Sea, China. MARINE POLLUTION BULLETIN 2020; 160:111621. [PMID: 32919123 DOI: 10.1016/j.marpolbul.2020.111621] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 08/24/2020] [Accepted: 08/25/2020] [Indexed: 06/11/2023]
Abstract
The ability of denitrifying microorganisms to respond to different ecological pressures remains unknown, especially in marine sediments rich in various heavy metals. Here, gene abundance and transcriptional abundance of five functional denitrification genes (narG, nirK, nirS, norB, and nosZ) in Bohai Sea sediments were examined, and high-throughput Illumina sequencing was used to analyze the community structure of nirK and nirS denitrifying bacteria. The nirS- and nirK-type denitrifying bacteria were classified into different genera. The heavy metal content in sediments was negatively correlated with transcriptional abundance of denitrifying genes, and RNA: DNA ratio for each gene was highest in central Bohai Sea. These results indicated the distribution of nitrite reductase denitrifying bacterial communities was affected by depth, total nitrogen, total phosphorus and sediment grain size. Heavy metal contamination in sediment environment may negatively regulate the transcriptional abundance of denitrifying genes and cause geographical differences in the denitrifying bacterial community structure.
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Affiliation(s)
- Quanrui Chen
- National Marine Environmental Monitoring Center, Dalian 116023, China; Xiamen University, Xiamen 361000, China
| | - Jingfeng Fan
- National Marine Environmental Monitoring Center, Dalian 116023, China.
| | - Hongxia Ming
- National Marine Environmental Monitoring Center, Dalian 116023, China
| | - Jie Su
- National Marine Environmental Monitoring Center, Dalian 116023, China
| | - Yantao Wang
- National Marine Environmental Monitoring Center, Dalian 116023, China; Dalian Ocean University, Dalian 116000, China
| | - Bin Wang
- Dalian Ocean University, Dalian 116000, China
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9
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Jiang R, Wang YS. Modeling the ecosystem response of the semi-closed Daya Bay to the thermal discharge from two nearby nuclear power plants. ECOTOXICOLOGY (LONDON, ENGLAND) 2020; 29:736-750. [PMID: 32440859 DOI: 10.1007/s10646-020-02229-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/05/2020] [Indexed: 06/11/2023]
Abstract
A two-dimensional flow model coupled with a nutrient, phytoplankton, zooplankton, and detritus (NPZD) ecosystem model was applied to simulate the thermal discharge of two nuclear power plants near Daya Bay of South China Sea, and their impact on hydrodynamic conditions and ecosystem. The results show that the thermal discharge influence area of neap tide is much larger than spring tide, and the high and mid temperature rise area in winter is much larger than that in summer. More importantly, the present data further confirmed that the Daya Bay ecosystem has significant responses to the thermal discharge in nutrients, phytoplankton and zooplankton. In winter and early spring, the thermal discharge facilitates the growth of phytoplankton and their abundance often peak in March and April. In summer, the thermal discharge inhibits the growth of phytoplankton and their abundance keep at a low level from June to August. Although the abundance of zooplankton changed with phytoplankton, the characteristic of seasonal variation of zooplankton do not coincide with the phytoplankton, but are lagged in time, by nearly one month. Moreover, the concentration of nutrients and chlorophyll a were compared between thermal discharge and the nearby aquaculture, which has shown that the aquaculture contributed more to the eutrophication.
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Affiliation(s)
- Rui Jiang
- State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - You-Shao Wang
- State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China.
- Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, 510301, China.
- Daya Bay Marine Biology Research Station, Chinese Academy of Sciences, 518121, Shenzhen, China.
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10
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Li M, Li K, Chen K, Liu C, Ma Y, Wang X. Size-based bioavailability of land-based DON and its impact on eutrophication of Jiaozhou bay. MARINE POLLUTION BULLETIN 2020; 152:110898. [PMID: 31957675 DOI: 10.1016/j.marpolbul.2020.110898] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 01/07/2020] [Accepted: 01/08/2020] [Indexed: 06/10/2023]
Abstract
With the increase in human activities, dissolved organic nitrogen (DON) has been the major nitrogen pool, which might impact on eutrophication of coastal water. We studied the bioavailability of different molecular size DON from the major sources of agricultural, domestic, industrial, and urban non-point source, respectively, in Jiaozhou bay, China. By clarifying the relationship between the source and molecular size, the bioavailability of terrestrial DON can be further understood based on the aspects of bioavailability proportion (BDON%) and kinetics with the help of ultraviolet radiation. The bioavailability proportion of high molecular size DON (HDON; >1000 Da) was higher than that of low molecular size DON (LDON; <1000 Da), with values of 58.0% to 35.1% for the HDON and values of 47.2% to 29.5% for the LDON, respectively. There were significant differences in the degradation rate constants (p < 0.05), which varied from 0.30 to 0.67 d-1 for HDON and from 0.13 to 0.75 d-1 for LDON. The SUVA254 values were significantly and negatively correlated with the bioavailabilities of DON, which can reflect to some extent the structure and molecular size. In order to study the influences of the different terrestrial DON inputs on the eutrophication of Jiaozhou bay, a modified 3D coupled biogeochemical model was used based on the survey data in August 2012. Two scenarios of DON loads from Haibo river and Dagu river were modeled. The impact on eutrophication of Jiaozhou bay is higher for the agricultural source of DON from Dagu river than for the domestic source from Haibo river.
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Affiliation(s)
- Min Li
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qing Dao 266100, China
| | - Keqiang Li
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qing Dao 266100, China.
| | - Kan Chen
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qing Dao 266100, China
| | - Cuicui Liu
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qing Dao 266100, China
| | - Yunpeng Ma
- Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266071, China
| | - Xiulin Wang
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qing Dao 266100, China
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