Developing Ecological Thresholds for Nitrogen and Phosphorus in the Haihe River Basin in China

Wu, Fan; Fang, Yuan; Feng, Mingfeng; Xie, Zhicheng; Zhu, Lin; Feng, Jianfeng

doi:10.3390/ijerph192416951

Cited by 4 publications

(2 citation statements)

References 34 publications

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“…As other large-scale studies for regional N boundaries, − , we used the uniformed threshold for all river sections. For future research, the spatially explicit N threshold in surface water reflecting the spatial variability in environmental tolerance of local water systems should be incorporated, which could further improve our spatially explicit estimates of the regional boundary for N. Research progresses have been made by emerging studies on deriving regional-specific thresholds for nutrient pollution in Chinese rivers. − However, these studies are scattered in time and space with small-scale field studies for small rivers or certain river sections of large basins. A complete and comparable set of region-specific N thresholds for rivers in China is still lacking.…”

Section: Resultsmentioning

confidence: 99%

Keeping Nitrogen Use in China within the Planetary Boundary Using a Spatially Explicit Approach

Chen,

Strokal,

van Vliet

et al. 2024

Environ. Sci. Technol.

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Nitrogen (N) supports food production, but its excess causes water pollution. We lack an understanding of the boundary of N for water quality while considering complex relationships between N inputs and in-stream N concentrations. Our knowledge is limited to regional reduction targets to secure food production. Here, we aim to derive a spatially explicit boundary of N inputs to rivers for surface water quality using a bottom-up approach and to explore ways to meet the derived N boundary while considering the associated impacts on both surface water quality and food production in China. We modified a multiscale nutrient modeling system simulating around 6.5 Tg of N inputs to rivers that are allowed for whole of China in 2012. Maximum allowed N inputs to rivers are higher for intensive food production regions and lower for highly urbanized regions. When fertilizer and manure use is reduced, 45–76% of the streams could meet the N water quality threshold under different scenarios. A comparison of “water quality first” and “food production first” scenarios indicates that trade-offs between water quality and food production exist in 2–8% of the streams, which may put 7–28% of crop production at stake. Our insights could support region-specific policies for improving water quality.

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Section: Resultsmentioning

confidence: 99%

Keeping Nitrogen Use in China within the Planetary Boundary Using a Spatially Explicit Approach

Chen,

Strokal,

van Vliet

et al. 2024

Environ. Sci. Technol.

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“…along with watershed factors (land use, geomorphic features, etc.) might have direct impacts on water quality in lakes, streams, and wetlands [7]. Shiferaw et al [8] identified agriculture and urban pollution as major pollution sources by the PMF method, identifying TP as limiting nutrients for algal blooms in Geum River.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of TP Load in the Largest Freshwater Lake of China in the Past Decade

2024

IJESD

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In order to reveal the evolution of TP pollution in Poyang Lake and the driving mechanism, this paper analyses the TP concentration in Poyang Lake during the period of 2012-2022 based on Mann-Kendall test and Pearson coefficient method combined with exogenous influencing factors. Results revealed that (1) Trends of interracial TP concentration in Poyang Lake varied significantly, with peaks of 0.115, 0.293 to 0.05 mg/L in 2014 and troughs of 0.032, 0.003 to 0.002 mg/L in 2019 at each lake area. However, TP in The South Lake was the opposite. The spatial distribution pattern of TP concentration in Poyang Lake showed that The Middle Lake (0.083 mg/L) > North Lake (0.069 mg/L) > South Lake (0.053 mg/L), and there were correlations among the Middle Lake, North Lake to South Lake. TP concentration in Middle Lake was significantly and positively correlated with the TP concentration of Gan Jiang (r1=0.322), and TP concentration in Middle Lake and North Lake was also significantly correlated with the TP concentration of Rao River (r2=0.446, r3=0.537). Whereas, TP concentration in North Lake and South Lake were less affected by the rivers. This study thoroughly analyzed the changes in TP concentration in Poyang Lake during the last decade to view its space-time distribution pattern and the driving mechanism of multiple factors. Research results would facilitate to better understating the variation of TP concentration and supply the scientific bases for water resources management and protection in Poyang Lake.

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Harmful Microalgae Exhibit Broad Environmental Adaptability in High‐Salinity Area Across the Dafengjiang River Estuary

Huang,

Zhao,

Wang

et al. 2024

Ecology and Evolution

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Harmful algal blooms (HABs) often occur in estuaries due to their unique environmental heterogeneity, posing significant environmental and human health risks. However, there is limited understanding of the community composition and community‐level change points (thresholds) of harmful microalgae in subtropical estuaries. This study explored harmful microalgae community structure and thresholds in the Dafengjiang River estuary using a metabarcoding approach. The results revealed 63 harmful microalgae species, and major species included Guinardia flaccida, Prorocentrum cordatum, Thalassiosira punctigera, Pseudo‐nitzschia galaxiae and T. gravida. Nonparametric change‐point analysis and threshold indicator taxa analysis (TITAN) showed threshold responses of harmful microalgae community structure to ammonium (57.5–60 μg·L−1), total phosphorus (27.8–28.5 μg·L−1) and dissolved inorganic phosphorus (14.5–28 μg·L−1) along the salinity gradient. Wider environmental thresholds were also found in hypersaline areas. Additionally, Pyrodinium bahamense, Pfiesteria piscicida, Skeletonema tropicum and T. punctigera were sensitive to environmental changes and thus could be used as bioindicators. Overall, our study unveiled diverse abrupt transitions of harmful microalgal communities, providing a risk assessment for human health and ecological safety in subtropical estuary ecosystems.

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Developing Ecological Thresholds for Nitrogen and Phosphorus in the Haihe River Basin in China

Cited by 4 publications

References 34 publications

Keeping Nitrogen Use in China within the Planetary Boundary Using a Spatially Explicit Approach

Keeping Nitrogen Use in China within the Planetary Boundary Using a Spatially Explicit Approach

Dynamics of TP Load in the Largest Freshwater Lake of China in the Past Decade

Harmful Microalgae Exhibit Broad Environmental Adaptability in High‐Salinity Area Across the Dafengjiang River Estuary

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