紫色土坡面植被格局对水土流失的影响

Effects of Vegetation Patterns on Soil and Water Loss in Purple Soil Slopeland

利用人工模拟降雨试验,研究了紫色土坡面不同植被格局对径流泥沙的影响。结果表明:在不同植被覆盖度下,不同降雨强度的流量顺序依次是坡顶格局>坡中格局>坡底格局。随着降雨强度的增大,植被格局对流量的影响趋向弱化。不同格局间的累积径流量随雨强的增大差异有所减小。植被格局对含沙量的影响变化趋势一致,即坡顶格局>坡中格局>坡底格局。植被格局对含沙量的影响随雨强的增大而增强,累积产沙量的差异也随之逐渐变大。

Used artificial rainfall simulation experiment to study the effects of different vegetation patterns on runoff and sediment in purple soil slopeland. The results showed that： The order of runoff discharge were top of slope pattern〉middle of slope pattern〉bottom of slope pattern in turn in different rainfall intensities and different vegetation covers. With rainfall intensities increasing, the effects of vegetation on runoff discharge trend to reduction. The gap of accumulated runoff of different vegetation patterns decreased with rainfall intensities increasing. The effects of vegetation patterns on sediment concentration variation tendency were coincident, that was top of slope pattern〉middle of slope pattern〉bottom of slope pattern. The effects of vegetation patterns on sediment concentration strengthen with rainfall intensities increasing. The gap of accumulated sediment yield of different vegetation patterns gradually became big.