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作 者 ：何常清薛建辉;吴永波;张雷燕;刘冲;刘兴良

期 刊 ：应用生态学报 2008年 19卷 09期 页码：1871-1876

关键词：川滇高山栎林；降雨再分配；茎流；林冠截留；

Keywords:Quercus aquifolioides forest, rainfall redistribution, stemflow,

摘 要 ：

基于2007年6—9月岷江上游地区的气象数据，采用定位研究方法对该区川滇高山栎林的降雨再分配进行了研究.结果表明：研究期间，林外总降雨量486.7 mm，林内穿透雨量、树干茎流量和林冠截留量分别占总降雨量的82.6%、0.9%和16.5%；穿透雨量和树干茎流量与降雨量均呈极显著的线性关系(P<0.01，n=49)，穿透雨率和树干茎流率与降雨量的关系可用非线性曲线表示；当林外降雨量>3.2 mm时开始出现树干茎流，且树干茎流量(L)与树干基面积(cm²)呈明显的指数关系(R²=0.623).林冠截留率随降雨量(mm)的增加呈双曲线递减；林冠截留率与降雨量、降雨持续时间、降雨强度、降雨时空气相对湿度均呈极显著负相关(P<0.01，n=49)，而与风速呈极显著正相关(P<0.01，n=49).

Abstract:Based on the meteorological data from June to September 2007, the rainfall redistribution in subalpine Quercus aquifolioides forest in the upper reaches of Minjiang River was investigated by permanent plot method. The results showed that the total rainfall outside the forest was 486.7 mm, and the throughfall, stemflow, and canopy interception accounted for 82.6%, 0.9%, and 16.5% of the total rainfall, respectively. The throughfall and stemflow had significant linear relationships with rainfall (P<0.01, n=49), and the relationships of throughfall ratio and stemflow ratio with rainfall could be described with nonlinear curves. When the rainfall outside the forest was more than 3.2 mm, stemflow would happen, and there existed a significant exponential (R²=0.623) relationship between the stemflow volume and the tree basal area. The canopy interception rate decreased hyperbolically with the increase of rainfall, being significantly negatively correlated with the rainfall amount, duration, and intensity as well as the air relative humidity during rainfall (P<0.01, n=49), but positively correlated with wind velocity (P<0.01,n=49).

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