Sources of Agricultural Non-point Nitrogen Pollution in Typical Small Watershed of Erhai Lake in Abundant Water Period

PAN Xiong; LIN Li; DONG Lei; XIE Ling-xian; HUANG Hua-wei; CHEN Jin

doi:10.11988/ckyyb.201908367

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Journal of Changjiang River Scientific Research Institute ›› 2020, Vol. 37 ›› Issue (10) : 16-20. DOI: 10.11988/ckyyb.201908367

WATER RESOURCES AND ENVIRONMENT

Sources of Agricultural Non-point Nitrogen Pollution in Typical Small Watershed of Erhai Lake in Abundant Water Period

PAN Xiong^1,2, LIN Li^1,2, DONG Lei^1,2, XIE Ling-xian^1,2, HUANG Hua-wei^1,2, CHEN Jin²

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Abstract

Agricultural non-point source pollution is the main factor of the deterioration of water quality of Erhai Lake in recent years. We studied the inorganic nitrogen isotope characteristics in the surface runoff of forest land, cultivated land and residential area in a typical small watershed of Erhai Lake. Source analysis of inorganic nitrogen showed that 8.53% and 91.47% of nitrate nitrogen in forest runoff came from atmospheric rainfall and soil, respectively; 19.78% and 80.22% of ammonia nitrogen in forest runoff were from atmospheric precipitation and soil. For cultivated land, 5.90%, 68.76% and 25.34% of nitrate nitrogen came from atmospheric rainfall, soil, and fertilizer, respectively, while ammonia nitrogen mainly came from soil. In residential runoff, 3.32% of nitrate nitrogen was coming from atmospheric rainfall, 55.42% from domestic sewage, and 41.26% from animal feces, while ammonia nitrogen was mainly coming from domestic sewage and animal feces.

Key words

Erhai lake / stable isotope / source appointment / agricultural non-point source pollution / inorganic nitrogen

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PAN Xiong, LIN Li, DONG Lei, XIE Ling-xian, HUANG Hua-wei, CHEN Jin. Sources of Agricultural Non-point Nitrogen Pollution in Typical Small Watershed of Erhai Lake in Abundant Water Period[J]. Journal of Changjiang River Scientific Research Institute. 2020, 37(10): 16-20 https://doi.org/10.11988/ckyyb.201908367

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