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The mechanisms of nutrient output through water flow from sloping farmland with slight rocky desertification in a karst region
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|Authors:||Gao Ruxue; Dai Quanhou; Gan Yixian; Yan Youjin; Peng Xudong|
|Author Affiliations:||Primary: |
Guizhou University, College of Forestry, Guiyang, China
|Volume Title:||Environmental Research Letters|
|Source:||Environmental Research Letters, 15(9). Publisher: IOP Publishing for Institute of Physics, Bristol, United Kingdom. ISSN: 1748-9326|
|Note:||In English. 54 refs.; illus., incl. sketch map, block diag., 4 tables|
|Summary:||Nutrient loss from sloping farmland with rocky desertification in karst regions leads to low farmland productivity and non-point source pollution. The mechanisms of nutrient outputs through water flow in such contexts under different rainfall intensities and slope angles were studied by using artificial rainfall simulation. Research showed that surface water flow occurred when the rainfall intensity was between 30 mm · h-1 and 50 mm · h-1, and the nutrient (TN, TP, TK) output through water flow showed the same pattern. Nutrient output through water flow was dominated by nutrient loss from surface and subsurface water flows when the rainfall intensity was ≥ 50 mm · h-1. Rainfall intensity was found to be a dominant driver in comparison to slope angle and for limestone soil of the karst region in Southwest China, but slope angle only had a significant effect on TP output through surface water flow. The largest proportion of nutrient output was associated with surface flow, a lower proportion was associated with subsurface flow, and the lowest proportion with underground flow. The nutrient output through underground water flow directly led to groundwater pollution, although it was not large. The results of this study provide a theoretical reference for the control of nutrient output through water flow and the management of nonpoint source pollution in karst regions. Copyright (Copyright) 2020 The Author(s). Published by IOP Publishing Ltd|
|Subjects:||Agriculture; Alkali metals; Aquifer vulnerability; Aquifers; Atmospheric precipitation; Carbonate rocks; Desertification; Erosion; Experimental studies; Fluid flow; Ground water; Human activity; Hydrology; Karst; Karst hydrology; Laboratory studies; Limestone; Marine environment; Metals; Nitrogen; Nonpoint sources; Nutrients; Phosphorus; Pollution; Potassium; Productivity; Radial flow; Rainfall; Risk assessment; Runoff; Sedimentary rocks; Simulation; Slope environment; Slope stability; Slopes; Soils; Streamflow; Surface water; Water pollution; Water quality; Water resources; Asia; China; Far East; Guiyang China; Guizhou China|
|Coordinates:||N244000 N292000 E1093000 E1030000|
|Copyright Information:||GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom|
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