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作者在云南哀牢山生态站对中山湿性常绿阔叶林进行了定位研究，根据１９９０～１９９２年所取得的观测资料，对林外大气降雨，林内雨及树干茎流的养分浓度，养分季节变化及养分贡献进行了分析和讨论，探讨了大气降雨对养分淋溶的影响。结果表明：Ｎ、Ｐ、Ｋ、Ｃａ、Ｍｇ浓度在林外降雨、林内降雨及树干流中有很大的差异。其养分浓度和养分输入均为雨季＞干季，且养分浓度除林外降雨中Ｎ浓度外，均表现树干茎流＞林内雨＞林外降雨。此外，对降雨和淋溶作用对林地养分物质输入的贡献也进行了分析和讨论。
Based on the observation data obtained from 1990 to 1992, the author studied the mid-mountain wet evergreen broad-leaved forest in Ailao Mountain Ecological Station in Yunnan Province. Changes and nutrient contributions were analyzed and discussed to discuss the impact of rainfall on nutrient leaching. The results showed that the concentrations of N, P, K, Ca and Mg were greatly different in the rainfall outside the forest, rainfall in the forest and trunk flow. The nutrient concentration and nutrient input were both in the wet season and in the dry season, and the nutrient concentrations showed the stem-stem flow, the rain in the forest, the rainfall in the forest except for the N concentration in the forest. In addition, the contributions of rainfall and leaching to the input of nutrient substances in forest land were also analyzed and discussed.