不同土地利用方式土壤侵蚀与养分流失的模拟试验

Simulation of Soil Erosion and Nutrition Runoff in Different Land Use Types

采用室内人工模拟降雨方法,研究河北太行山南段低山丘陵片麻岩褐土区3种土地利用方式(草地、坡耕地、刺槐林)土壤侵蚀与养分流失规律,分析土壤养分流失的空间变化以及养分流失与土壤侵蚀的关系,比较流失泥沙中的养分含量与表土和径流中的养分含量变化。结果表明:流失泥沙中的养分含量明显高于径流中的养分含量,也明显高于雨前表土中的养分含量,具有较大的养分富集比;土壤中流失的养分与流失泥沙量具有较好的相关性。

This paper emphasized on the rules of mountain soil erosion and nutrient loss in the hill of gneiss and cinnamon soil district, which locating in the south of Taihang Mount, Hebei Province. Based on the artificial rain method in the laboratory, spatial changes of nutrient loss and its relationship with soil erosion were analyzed. The changes of nutrient content in sediment, surface soil and loss were also contrasted. The results indicated that nutrient content in sediment was significantly higher than that in loss and surface soil before rain. So the nutrient enrichment ratio in the sediment was bigger. Nutrient loss from soil has a good relationship with sediment.