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Identification of critical sources and characteristic analysis of nitrogen and phosphorus pollution in Yanjin River Basin based on SWAT Model
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Yang BI1, Yi RONG2, Yan-xin ZHAO2, Yan CHEN2, Kai HUANG1, *, Dong WANG2
China Environmental Science | 2025, 45(12) : 6881 - 6891
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China Environmental Science | 2025, 45(12): 6881-6891
• Environmental Ecology •
Identification of critical sources and characteristic analysis of nitrogen and phosphorus pollution in Yanjin River Basin based on SWAT Model
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Yang BI1, Yi RONG2, Yan-xin ZHAO2, Yan CHEN2, Kai HUANG1, *, Dong WANG2
Affiliations
  • 1.College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
  • 2.Chinese Academy of Environmental Planning, Ministry of Ecology and Environment, Beijing 100041, China
Published: 2025-12-20
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By constructing a SWAT model, this study simulated the variations in runoff and nitrogen/phosphorus load fluxes at control sections of the Yanjin River Basin in 2023, analyzed the spatiotemporal characteristics of point and non-point source load emissions, and evaluated the applicability of the SWAT model in the karst region of southwestern China. The results show that: during the validation period, the SWAT model achieved R2 values of 0.77, 0.82, and 0.84 for runoff, TN, and TP simulations, respectively, with Nash-Sutcliffe efficiency coefficients of 0.77, 0.67, and 0.78, indicating good applicability in typical karst areas. The main emission zones for total nitrogen (TN) were distributed in the central and southwestern parts of the basin, while total phosphorus (TP) emissions were concentrated in the eastern-central and southwestern regions, reflecting spatial differences in land use and industrial activities. Agricultural non-point sources and urban non-point sources were the dominant contributors to TN and TP losses, accounting for 52% and 31.4% of the total losses, respectively. TN and TP emissions during the flood season reached 2.2 and 3 times those of the non-flood season, with significant correlations between nitrogen/phosphorus loss and rainfall intensity. TP loss was more susceptible to heavy rainfall events.

Yanjin River Basin  /  SWAT model  /  nitrogen and phosphorus pollution loads  /  key source identification
毕杨, 荣易, 赵琰鑫, 陈岩, 黄凯, 王东. 基于SWAT模型的盐津河流域氮磷污染关键源识别及特征解析. 中国环境科学, 2025 , 45 (12) : 6881 -6891 .
Yang BI, Yi RONG, Yan-xin ZHAO, Yan CHEN, Kai HUANG, Dong WANG. Identification of critical sources and characteristic analysis of nitrogen and phosphorus pollution in Yanjin River Basin based on SWAT Model[J]. China Environmental Science, 2025 , 45 (12) : 6881 -6891 .
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Year 2025 volume 45 Issue 12
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Article Info
  • Receive Date：2025-04-30
  • Online Date：2026-10-08
  • Published：2025-12-20
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  • Received：2025-04-30
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Affiliations
    1.College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
    2.Chinese Academy of Environmental Planning, Ministry of Ecology and Environment, Beijing 100041, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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