Runoff-associated nitrogen and phosphorus losses under natural rainfall events in purple soil area: the role of land disturbance and slope length

被引:7
作者
Liang, Ke [1 ]
He, Xiaorong [2 ]
He, Binghui [1 ]
Guo, Xiaomeng [3 ]
Li, Tianyang [1 ]
机构
[1] Southwest Univ, Coll Resources & Environm, Chongqing 400715, Peoples R China
[2] Bishan Ecoenvironm Monitoring Stn Soil & Water Co, Chongqing 402760, Peoples R China
[3] Harbin Inst Technol, Sch Environm, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China
基金
中国国家自然科学基金;
关键词
artificial disturbance; natural restoration; nitrogen and phosphorus concentrations; non-point source pollution; rainfall monitoring; slope length; NUTRIENT LOSS; SUBSURFACE FLOW; SEDIMENT YIELD; EROSION; INTENSITY; TRANSPORT; TILLAGE; RESIDUE; COVER; CHINA;
D O I
10.2166/ws.2021.300
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Land disturbance and slope length play key roles in affecting runoff-associated nitrogen (N) and phosphorus (P) losses in different forms under natural rainfall. Field monitoring was conducted in nine plots located parallel on a 15 degrees purple slope in southwest China. Three slope lengths (20-, 40-, 60-m) combined with measures of artificial disturbance and natural restoration were implemented. The highest N concentration was observed in soft rainfall events across all plots. The highest P concentration was recorded in heavy rainfall events for the artificially disturbed plots and in soft rainfall events for the naturally restored plots. Land disturbance differed orthophosphate concentration in 20-m plot, and affected N and P loss amounts in different forms. Slope length differed total dissolved phosphorus concentration in naturally restored plots, and also differed the loss amounts of total dissolved nitrogen and orthophosphate in artificially disturbed plots. Naturally restoration reduced loss amounts of total nitrogen and total phosphorus by 62.14-79.05% and 79.28-83.43% relative to artificial disturbance, respectively. Concentrations of nitrate-nitrogen, total phosphorus and dissolved phosphorus were closely correlated with rainfall and runoff variables, respectively, in artificially disturbed plots. Our results highlight the dominant role of natural restoration in reducing erosion and nutrient loss in sloping land.
引用
收藏
页码:1995 / 2007
页数:13
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