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Identification of Critical Source Areas of Nitrogen Load in the Miyun Reservoir Watershed under Different Hydrological Conditions

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  • Yingzhuang Guo

    (College of Resources, Environment and Tourism, Capital Normal University, Beijing 100048, China)

  • Xiaoyan Wang

    (College of Resources, Environment and Tourism, Capital Normal University, Beijing 100048, China)

  • Lili Zhou

    (College of Resources, Environment and Tourism, Capital Normal University, Beijing 100048, China)

  • Charles Melching

    (Melching Water Solutions, 4030 W. Edgerton Avenue, Greenfield, WI 53221, USA)

  • Zeqi Li

    (College of Resources, Environment and Tourism, Capital Normal University, Beijing 100048, China)

Abstract

The spatiotemporal distribution of critical source areas (CSAs) will change with hydrological conditions. In this study, the CSAs of nitrogen load under different hydrological conditions in the Chaohe River watershed were identified using the cumulative pollution load curve method determined from the nitrogen pollution simulated using the Soil and Water Assessment Tool (SWAT) model. The results showed that: (1) The order of factors impacting nitrogen load intensity is as follows: fertilization intensity, rainfall, runoff, land use type, slope type, and soil type. (2) The primary and secondary CSAs are concentrated in the upper and lower areas of the watershed, where cultivated land (8.36%) and grassland (52.55%) are more abundant. The potential pollution source areas are concentrated in the upper and middle areas of the watershed, where cultivated land (6.99%), grassland (42.37%), and forest land (48.18%) are evenly distributed. The low-risk source areas are concentrated in the middle and left bank of the watershed, where forest land (67.65%) is dominant and the vegetation coverage is highest. The research results have significance for improving the accuracy of the implementation of best management practices, and can provide a reference for the formulation of drinking water protection policies for Beijing.

Suggested Citation

  • Yingzhuang Guo & Xiaoyan Wang & Lili Zhou & Charles Melching & Zeqi Li, 2020. "Identification of Critical Source Areas of Nitrogen Load in the Miyun Reservoir Watershed under Different Hydrological Conditions," Sustainability, MDPI, vol. 12(3), pages 1-22, January.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:3:p:964-:d:314068
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    References listed on IDEAS

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    2. Ramesh P. Rudra & Balew A. Mekonnen & Rituraj Shukla & Narayan Kumar Shrestha & Pradeep K. Goel & Prasad Daggupati & Asim Biswas, 2020. "Currents Status, Challenges, and Future Directions in Identifying Critical Source Areas for Non-Point Source Pollution in Canadian Conditions," Agriculture, MDPI, vol. 10(10), pages 1-25, October.
    3. Kai Zhang & Shunjie Wang & Shuyu Liu & Kunlun Liu & Jiayu Yan & Xuejia Li, 2022. "Water Environment Quality Evaluation and Pollutant Source Analysis in Tuojiang River Basin, China," Sustainability, MDPI, vol. 14(15), pages 1-17, July.

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