【摘要】 用定位观测研究表明，降雨是林地形成土壤肥力的重要机制；特别是通过林冠层的穿透水和树干的径流水，其养分通量平均要比林外雨高80％左右，但在不向的气候条件下和在不同的森林类型里，降雨输入土壤的养分存在着较大的差异，在无植被覆盖的坡地上，降雨会造成土壤侵蚀，使土壤养分入不敷出。更多还原

【Abstract】 Results of a long-term experiment on fbrest soil indicated that the precipitation was an important way　of nutrient input to forest soil, especially, the mean nutrient fluxes of canopy throughfall and stemflow were about 1.8 times as much as that of rainwater on uncovered land. Whereas, the inputs of nutrients from rainfall were quite different among different climatic conditions and forest types. The precipitation caused soil erosion on the barren slope land, resulting in exhaustion of soil nutrients.更多还原