The production processes and characteristics of nitrogen pollution in bare sloping farmland in a karst region.

The production processes and characteristics of nitrogen pollution in bare sloping farmland in a karst region. Environ Sci Pollut Res Int. 2019 Jul 13;: Authors: Gao R, Dai Q, Gan Y, Peng X, Yan Y Abstract 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 · h-1. TN was lost at the surface and underground when the rainfall intensity was ≥ 50 mm · 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 su...
Source: Environmental Science and Pollution Research International - Category: Environmental Health Authors: Tags: Environ Sci Pollut Res Int Source Type: research