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分别从林冠层、灌木层、草本层、凋落物层及土壤层５个层次对不同混交比例的杉木拟赤杨混交林涵养水源功能的研究结果表明：混交林涵养水源功能主要体现在调节降雨分配和增加林地蓄水能力上。不同比例混交林持水量大小排序为：１：１行间混交林＞３：１带状混交林＞１：１株间混交林＞杉木纯林。林分不同层次的持水量表现为土壤层＞林冠层＞灌木层＞凋落物层＞草本层。杉木拟赤杨混交林具有比杉木纯林更好的涵养水源功能。
The results showed that the function of water conservation in the mixed forest of Alnus japonicus with different mixed percentages was mainly reflected in the regulation of rainfall distribution And increase the capacity of forest water storage. The order of water holding capacity of mixed forest with different proportion was as follows: 1: 1 mixed forest> 3: 1 mixed forest> 1: 1 mixed forest> pure Chinese fir forest. The water holding capacity at different levels of stand showed soil layer> canopy layer> shrub layer> litter layer> herb layer. Cunninghamia lanceolata mixed forest has better water conservation function than pure Chinese fir plantation.