不同雨强条件下红壤坡地养分流失特征研究

采用人工模拟降雨装置 ,对红壤坡地养分流失特征进行了试验研究 ,结果表明 :在雨强较大情况下 ,土壤养分以泥沙形式随径流迁移 ;当雨强较小时 ,随径流迁移的可溶态养分流失量占流失泥沙养分量的比例较高 ,土壤养分流失氮、磷、钾分别达到 5 3.12 % ,2 3.1% ,2 1.5 % ;不同形态的养分在流失泥沙中均有养分富集现象 ,但富集率各不相同 ;土壤养分流失量与雨强及泥沙流失量呈正相关关系。

Study on Properties of Nutrient Loss from Red Soil in Sloping Land under Different Rainfall Intensities

A field study of soil nutrient loss was conducted in red soil on sloping surface by using rainfall simulator. The results showed that soil nutrients were transported mainly with sediment in runoff in high rainfall intensities. In low rainfall intensities, nutrients lost in soluble form had high percentage with runoff water. Nitrogen, phosphorus and potassium lost in soluble form account for 53.21%, 23.1%, 21.5% of the total nutrient lost in sediment respectively. Nutrient enrichment occurred in both sediment and soluble form, but the enrichment ratio was different. The amount of lost nutrients were correlated positively with rainfall intensities and lost sediment.