紫色土坡地不同种植模式下径流及养分流失研究

Research on Runoff and Nutrient Loss From Slopeland of Purple Soil under Different Planting Model

对紫色土坡地6种种植模式下的径流泥沙与养分流失进行了观测统计分析,结果表明,6种种植模式下的径流量、泥沙流失量及养分流失量存在显著的差异,南方早熟梨+紫花苜蓿及柑橘+鸭茅两种果草模式与其它种植模式相比其径流过程曲线较为平滑,无突显的径流峰值点,径流量最少,两种果草模式各项养分流失量与传统顺坡种植模式相比减少了4～7倍不等;流失泥沙中的养份含量高于背景土壤和溶蚀携带,具有富集养分的特征,其富集比大多在1.3～2.4之间。

Besed on the investigation and sampling analysis of runoff and nutrient under six land utilization forms, resu1ts showed that the majority of soil nutrients was removed with runoff and sediment. The runoff quantities and nutrient loss quantities under different land utilization forms had obvious imparity. Two kinds intercropping or- chard-pasturage increased antierodibility so as to raise the soil productivity. The sediment concentrated the lost nu- trient of runoff.