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为了分析大气降水的化学物质输入及其降水淋溶对云南哀牢山森林生态系统生物物质循环产生的影响。通过观测大气降雨过程中大气降水、穿透雨及树干茎流在１９９１年５月～１９９３年４月间的变化并测定其相应的水质特征，发现①大气降雨和穿透雨是养分输入的主要形式，其中以穿透雨养分输入为主，树干茎流养分输入很小，可忽略不计。Ｎ、Ｐ、Ｋ、Ｃａ、Ｍｇ养分元素的输入量是穿透雨：６．０９９，０．４２３，５．９１５，１．７８９和０．７７１ｋｇ·ｈｍ－２·ａ－１；大气降雨：１４．１８，０．１２３，０．０８，１．４２９和０．１８３ｋｇ·ｈｍ－２·ａ－１；②Ｎ、Ｐ、Ｋ、Ｃａ、Ｍｇ浓度在大气降雨、穿透雨和树干茎流中有很大差异，三种养分输入形式除Ｎ外，浓度大小依次是：树干茎流＞穿透雨＞大气降雨。其中穿透雨Ｎ＞Ｋ＞Ｃａ＞Ｍｇ＞Ｐ；树干茎流Ｋ＞Ｎ＞Ｃａ＞Ｍｇ；大气降雨Ｎ＞Ｃａ＞Ｍｇ＞Ｐ＞Ｋ。表明大气降雨中化学物质输入对穿透雨和树干茎流具有较大影响
In order to analyze the effects of input of precipitation of atmospheric precipitation and its rainfall leaching on the biological material circulation of forest ecosystems in Ailao Mountains, Yunnan, China, By observing the changes of atmospheric precipitation, penetration and stem-stem flow during atmospheric rainfall from May 1991 to April 1993 and measuring their corresponding water quality characteristics, it was found that ① atmospheric rainfall and through-rainfall are the major inputs of nutrients Form, of which the penetration of rain nutrient input, trunk stem flow nutrient input is small, negligible. The input of N, P, K, Ca, Mg nutrients was through rain: 6.099,0.423,5.915,1.789 and 0.771kg · hm-2 · a-1; 14.18, 0.123, 0.08, 1.429 and 0.183 kg · hm-2 · a-1, respectively; ② The concentrations of N, P, K, Ca and Mg varied with the rainfall, There is a big difference between the three nutrient input forms except for N, the concentration of the order is: stems stem flow> penetration of rain> atmospheric rainfall. Among them, rain N> K> Ca> Mg> P; stems stem flow K> N> Ca> Mg; It indicates that the input of chemical substances in atmospheric rainfall has a great influence on the penetration of rain and stem stem flow