期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 26, 期 26, 页码 26900-26911出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-019-05838-z
关键词
Karst sloping farmland; Rainfall intensity; Underground pore fissure degree (UPFD); Total nitrogen loss; Pollution modulus of TN
资金
- National Natural Science Foundation of China [41671275]
- National Key Research and Development Plan [2016YFC0502604]
- High-level Innovative Talents in Guizhou Province of Guizhou Province [Qian Ke He Platform Talents [2018] 5641]
- Major Project of Guizhou Province [Qian Ke He Major Project [2016] 3022]
- science and technology projects of Guizhou Province [Qian Ke He Platform Talents [2017] 5788]
Nitrogen loss in karst sloping farmland will lead to declining land productivity and environmental pollution, in which the nitrogen loss through underground pore fissures will directly lead to groundwater pollution. The characteristics of total nitrogen (TN) production were studied by simulating the dual structure microenvironment of sloping farmland in a karst region using an artificial rainfall simulation method. The results show that rainfall was the main driving factor of TN loss in karst sloping farmland. TN was mainly lost through underground pore fissures when the rainfall intensity was <= 30 mm center dot h(-1). TN was lost at the surface and underground when the rainfall intensity was >= 50 mm center dot h(-1), TN loss on the surface accounted for a large proportion, and the surface flow was the main carrier of TN loss. The TN loss underground is easily ignored because it is hidden underground. Therefore, TN loss belowground in karst sloping farmland should receive increased attention. It would be interesting to explore the influences of connectivity and type of underground pore fissure system on TN loss in karst sloping farmland. The prevention and control of TN loss in karst sloping farmland should be considered both at the surface and underground. Reducing the formation of slope flows and slowing rainwater filtration by increasing slope vegetation coverage can be considered to reduce TN loss. The results of this study provide a theoretical reference for agricultural non-point source pollution control in a karst region. Graphical abstract
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