中文摘要：

采用人工模拟降雨研究了不同坡度和降雨强度条件下紫色土坡地的磷素迁移方式和规律.结果表明,降雨强度和坡度越大,颗粒态生物可利用磷（BPP）输出值越大.壤中流BPP浓度为地表径流BPP输出浓度的30%-45%;壤中流可在一定程度上减缓地表径流和生物可利用磷（BAP）的输出;地表径流和壤中流水溶性磷（DP）输出无显著差异,BPP与BAP浓度比在80%以上;BPP主要通过泥沙以径流方式迁移,壤中流的少量泥沙是壤中流BPP迁移的主要途径;BAP输出浓度和径流量的关系显著相关.暴雨易引起BAP和泥沙的大量迁移,表明强度大的降雨可能给水体环境带来更大的压力.

英文摘要：

Through artificial simulated rainfall, under the condition of different sloping degree and rainfall intensity the purple soil sloping land phosphorus element transported type and law were studied. Variable intensity field artificial rainfall simulations were performed on 5.0m long × 1.0m wide × 0.5m high plot, and overland runoff and subsurface flow were collected. Bio-available phosphorus（BAP） export changed with increscent rainfall intensity and gradient, and the sediment extractable bio-available phosphorus （BPP） exported out concentration through subsurface flow was about 30%-45% of that through overland runoff; subsurface flows decrease the overland runoff and BAP transported out concentration; overland runoff and subsurface flow dissolved phosphorus （DP） transporting out had not remarked variation, the BPP and BAP concentration ratio was above 80%. A few amounts of sediment contained in subsurface runoff were the main way that the BPP of subsurface runoff exporting out and the BAP transporting out concentration and runoff amount relation was related markedly. Storm rain easily caused large amount transporting of bio-available phosphorus and sediment, indicating that the rainfall of great intensity degree could bring great pressure to the water environment.