Persistent eutrophication and hypoxia in the coastal ocean

Cambridge Prisms Coastal Futures, Journal Year: 2023, Volume and Issue: 1

Published: Jan. 1, 2023

Abstract Coastal eutrophication and hypoxia remain a persistent environmental crisis despite the great efforts to reduce nutrient loading mitigate associated damages. Symptoms of this have appeared spread rapidly, reaching developing countries in Asia with emergences Southern America Africa. The pace changes underlying drivers not so clear. To address gap, we review up-to-date status mechanisms global coastal oceans, upon which examine trajectories over 40 years or longer six model systems varying socio-economic development statuses different levels histories eutrophication. Although these share common features eutrophication, site-specific characteristics are also substantial, depending on regional setting level social-economic along policy implementation management. Nevertheless, ecosystem recovery generally needs greater reduction pressures compared that initiated degradation becomes less feasible achieve past norms time anthropogenic ecosystems. While qualitative causality between consequences is well established, quantitative attribution remains difficult especially when consider social economic because ecosystems subject multiple influences cause–effect relationship often non-linear. Such relationships further complicated by climate been accelerating few decades. knowledge gaps limit our mechanistic understanding human-coastal ocean nexus identified, essential for science-based making. Recognizing lessons from management practices, advocate better, more efficient indexing system an advanced earth modeling framework optimal modules human dimensions facilitate evaluation effective restoration actions.

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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Advances in Catchment Science, Hydrochemistry, and Aquatic Ecology Enabled by High-Frequency Water Quality Measurements

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(12), P. 4701 - 4719

Published: March 13, 2023

High-frequency water quality measurements in streams and rivers have expanded scope sophistication during the last two decades. Existing technology allows situ automated of constituents, including both solutes particulates, at unprecedented frequencies from seconds to subdaily sampling intervals. This detailed chemical information can be combined with hydrological biogeochemical processes, bringing new insights into sources, transport pathways, transformation processes particulates complex catchments along aquatic continuum. Here, we summarize established emerging high-frequency technologies, outline key hydrochemical data sets, review scientific advances focus areas enabled by rapid development rivers. Finally, discuss future directions challenges for using bridge management gaps promoting a holistic understanding freshwater systems catchment status, health, function.

Language: Английский

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The spatial spillover effect and impact paths of agricultural industry agglomeration on agricultural non-point source pollution: A case study in Yangtze River Delta, China

Journal of Cleaner Production, Journal Year: 2023, Volume and Issue: 401, P. 136600 - 136600

Published: March 6, 2023

Language: Английский

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Thirty years of experience in water pollution control in Taihu Lake: A review

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 914, P. 169821 - 169821

Published: Jan. 6, 2024

Language: Английский

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Impact of groundwater nitrogen legacy on water quality

Nature Sustainability, Journal Year: 2024, Volume and Issue: 7(7), P. 891 - 900

Published: June 12, 2024

Abstract The loss of agricultural nitrogen (N) is a leading cause global eutrophication and freshwater coastal hypoxia. Despite regulatory efforts, such as the European Union’s Nitrogen Directive, high concentrations N persist in freshwaters. Excessive leaching accumulation groundwater has created substantial reservoir travel times are orders-of-magnitude slower than those surface waters. In this study we reconstructed past projected future dynamics for four major river basins, Rhine, Mississippi, Yangtze Pearl, showcasing different trajectories. Rhine Mississippi basins have accumulated since 1950s although strategies to reduce excess worked well legacy persists Mississippi. Pearl entered phase 1970s expected continue until 2050. Policies pollution from fertilizers not halted accumulation, highlighting importance accounting groundwater. Restoring storage 1970 levels by diminishing will therefore take longer (>35 years) (9 (15 years). Sustainable watershed management requires long-term that address impacts promote sustainable practices aligned with Development Goals balance productivity water conservation.

Language: Английский

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Nitrogen and phosphorus trends in lake sediments of China may diverge

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: March 26, 2024

Abstract The brief history of monitoring nutrient levels in Chinese lake waters limits our understanding the causes and long-term trends their eutrophication constrains effective management. We therefore synthesize data from lakes China to reveal historical changes project future 2100 using models. Here we show that average concentrations nitrogen phosphorus sediments have increased by 267% 202%, respectively since 1850. In model projections, 2030–2100, studied may decrease, for example, 87% southern districts 19% northern districts. However, will continue increase an 25% Eastern Plain, Yunnan–Guizhou Plateau, Xinjiang. Based on this differentiation, suggest management should be carried out at district level help develop rational sustainable environmental strategies.

Language: Английский

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Restoring small water bodies to improve lake and river water quality in China

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 2, 2025

Abstract Climate change, population growth, and agricultural intensification are increasing nitrogen (N) inputs, while driving the loss of inland water bodies that filter excess N. However, interplay between N inputs body dynamics, its implications for quality remain poorly understood. Analyzing data from 1995 to 2015 across China, here, we find a 71% reduction in area small (<10 4.5 m 2 ) (SWB), primarily high-N-input regions. Preferential SWBs, most efficient nutrient filters, places 42% China at high risk due declining SWB density. Currently, removal by is 986 kilotonnes year −1 , but restoring 2.3 million hectares could increase 21%, compared just 5% equivalent restoration large bodies. Targeted crucial improving mitigating pollution China.

Language: Английский

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Chronic nitrogen legacy in the aquifers of China

Communications Earth & Environment, Journal Year: 2025, Volume and Issue: 6(1)

Published: Jan. 28, 2025

Language: Английский

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Tradeoffs and synergies in wetland multifunctionality: A scaling issue

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 862, P. 160746 - 160746

Published: Dec. 10, 2022

Wetland area in agricultural landscapes has been heavily reduced to gain land for crop production, but recent years there is increased societal recognition of the negative consequences from wetland loss on nutrient retention, biodiversity and a range other benefits humans. The current trend therefore re-establish wetlands, often with an aim achieve simultaneous delivery multiple ecosystem services, i.e., multifunctionality. Here we review literature key objectives used motivate re-establishment temperate (provision flow regulation, climate mitigation, conservation cultural services), their relationships environmental properties, order identify potential tradeoffs synergies concerning development multifunctional wetlands. Through this process, find that need change scale focus single wetlands wetlandscapes (multiple neighboring including catchments surrounding landscape features) if goals are be achieved. Finally, discuss factors considered when planning can support achievement wide at scale.

Language: Английский

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