Contributions of external nutrient loading and internal cycling to cyanobacterial bloom dynamics in Lake Taihu, China: Implications for nutrient management

Limnology and Oceanography, Journal Year: 2021, Volume and Issue: 66(4), P. 1492 - 1509

Published: Feb. 4, 2021

Abstract Harmful cyanobacterial blooms (CyanoHABs) are linked to increasing anthropogenic nitrogen (N) and phosphorus (P) inputs. However, CyanoHABs in many large lakes continue despite extensive abatement efforts, mostly focused on external P loading. Internal nutrient cycling can modify availability limitation; thus, understanding the relative importance of vs. internal loading is essential for developing effective mitigation strategies CyanoHABs. We estimated long‐term budgets Lake Taihu, China, from mass balance models using monitoring input output data 2005 2018 quantify contributions The showed that 9% 63% annual N inputs, respectively, were retained lake. Denitrification removed 54% thus help explain rapid decreases lake concentrations summer limitation. Water column regeneration sustain over short term contributed 38–58% potential demand summer‐fall, Microcystis ‐dominated blooms. release 23–90% demand, although Taihu was a net sink an scale. Our results show helps reductions Furthermore, leaving faster than P, thereby creating persistent Therefore, parallel loading, along with will be most reducing accelerate recovery process this other large, shallow lakes.

Language: Английский

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Harmful cyanobacteria-diatom/dinoflagellate blooms and their cyanotoxins in freshwaters: A nonnegligible chronic health and ecological hazard

Water Research, Journal Year: 2023, Volume and Issue: 233, P. 119807 - 119807

Published: Feb. 25, 2023

Language: Английский

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Recent advancement in water quality indicators for eutrophication in global freshwater lakes

Environmental Research Letters, Journal Year: 2023, Volume and Issue: 18(6), P. 063004 - 063004

Published: April 26, 2023

Abstract Eutrophication is a major global concern in lakes, caused by excessive nutrient loadings (nitrogen and phosphorus) from human activities likely exacerbated climate change. Present use of indicators to monitor assess lake eutrophication restricted water quality constituents (e.g. total phosphorus, nitrogen) does not necessarily represent environmental changes the anthropogenic influences within lake’s drainage basin. Nutrients interact multiple ways with climate, basin conditions socio-economic development, point-source, diffuse source pollutants), systems. It therefore essential account for complex feedback mechanisms non-linear interactions that exist between nutrients ecosystems assessments. However, lack set holistic understanding challenges such assessments, addition limited monitoring data available. In this review, we synthesize main freshwater basins only include but also sources, biogeochemical pathways responses emissions. We develop new causal network (i.e. links indicators) using DPSIR (drivers-pressure-state-impact-response) framework highlights interrelationships among provides perspective dynamics basins. further review 30 key drivers pressures seven cross-cutting themes: (i) hydro-climatology, (ii) socio-economy, (iii) land use, (iv) characteristics, (v) crop farming livestock, (vi) hydrology management, (vii) fishing aquaculture. This study indicates need more comprehensive systems, guide expansion networks, support integrated assessments manage eutrophication. Finally, proposed can be used managers decision-makers realistic targets sustainable management achieve clean all, line Sustainable Development Goal 6.

Language: Английский

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Harmful algal blooms in inland waters

Nature Reviews Earth & Environment, Journal Year: 2024, Volume and Issue: 5(9), P. 631 - 644

Published: Aug. 27, 2024

Language: Английский

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Influence of meteorological elements and inflow pollution loads on cyanobacterial blooms trends: An integrated environmental fluid dynamics code model and comprehensive trend detection method

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 132789 - 132789

Published: Feb. 1, 2025

Language: Английский

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Internal loading of phosphate in Lake Erie Central Basin

The Science of The Total Environment, Journal Year: 2016, Volume and Issue: 579, P. 1356 - 1365

Published: Dec. 4, 2016

Language: Английский

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Phytoplankton blooms in Lake Erie impacted by both long-term and springtime phosphorus loading

Journal of Great Lakes Research, Journal Year: 2017, Volume and Issue: 43(3), P. 221 - 228

Published: May 12, 2017

Harmful algal blooms in Lake Erie have been increasing severity over the past two decades, prompting new phosphorus loading target recommendations. We explore long-term drivers of phytoplankton by leveraging estimates historical bloom extent from Landsat 5 covering 1984–2001 together with existing data 2002–2015. find that a linear combination springtime and cumulative dissolved reactive (DRP) explains high proportion interannual variability maximum summertime for 1984–2015 (R2 = 0.75). This finding suggests impacts internal are potentially greater than previously understood, hypothesized recent increased susceptibility to may be attributable decadal-scale loading. Based on this combined model, achieving mild conditions (defined studies as areas below 600 km2 nine years out ten) would require DRP loads reduced 58% relative 2001–2015 average (equivalent annual 240 MT April July 78 MT). Reaping full benefits load reductions therefore take up decade due effects

Language: Английский

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Algal Accumulation Decreases Sediment Nitrogen Removal by Uncoupling Nitrification-Denitrification in Shallow Eutrophic Lakes

Environmental Science & Technology, Journal Year: 2020, Volume and Issue: 54(10), P. 6194 - 6201

Published: March 19, 2020

In eutrophic lakes, the decay of settled algal biomass generates organic carbon and consumes oxygen, favoring sediment nitrogen loss via denitrification. However, persistent winds can cause algae to accumulate into dense mats, with uncertain impacts on removal. this study, we investigated effects accumulation removal in a shallow Chinese lake, Taihu. We found that experimental treatments increased were associated decreased losses, indicating potential for break coupled nitrification-denitrification. Likewise, field measurements indicated similar decreases losses when occurred. It is possibly caused by excess biomass, which likely depleted dissolved could have inhibited nitrification thereby denitrification sediments. estimate if such accumulations occurred over 20% or 10% lake area Taihu, rates from 835.6 167.2 77.2 μmol N m–2h–1, respectively, during period. While may recover later, apparent decrease create window proliferation intensification. This study advances our knowledge blooms lakes.

Language: Английский

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Recent trends in nutrient and sediment loading to coastal areas of the conterminous U.S.: Insights and global context

The Science of The Total Environment, Journal Year: 2018, Volume and Issue: 654, P. 1225 - 1240

Published: Nov. 3, 2018

Coastal areas in the U.S. and worldwide have experienced massive population land-use changes contributing to significant degradation of coastal ecosystems. Excess nutrient pollution causes ecosystem degradation, both regulatory management efforts targeted reducing sediment loading rivers. Decadal trends flow-normalized loads were determined for 95 monitoring locations on 88 rivers, including tributaries Great Lakes, between 2002 2012 nitrogen (N), phosphorus (P), sediment. N P from urban watersheds generally decreased 2012. In contrast, agricultural variable indicating uneven progress decreasing loading. Coherent decreases occurred Lake Erie basin, but limited benefit is expected these because primary driver lake. Nutrient undeveloped was low, increased 2012, possibly that are minimally affected by human activities. Regional differences evident, with stable Mississippi River Gulf Mexico, commonly increasing Chesapeake Bay. Compared global rivers conterminous U.S somewhat lower TN yields slightly higher TP yields, similarities exist among land use, sources, loads. Despite widespread watersheds, recent N:P ratios remained elevated compared historic values many areas. Additional waters, particularly outside areas, would

Language: Английский

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Deep reinforcement learning for the real time control of stormwater systems

Advances in Water Resources, Journal Year: 2020, Volume and Issue: 140, P. 103600 - 103600

Published: April 29, 2020

Language: Английский

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