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对林外降水和１８年生日本柳杉及日本扁柏的树冠穿透水中溶存元素浓度的系统测定表明：酸性降水在穿透树冠层时ｐＨ和溶存元素浓度有不同程度的升高，这种变化日本柳杉比日本扁柏更为明显。树冠穿透水中溶存元素量的增加主要来自干性沉降和树冠淋溶。采用多变量回归模型，以无雨期长短、降水量和降水酸度为自变量，以树冠穿透水溶存元素的净增加量为因变量对干性沉降和树冠淋溶量作了分离。研究结果基本说明了树冠穿透水的水质特性及其形成机理。
The systematic determination of the concentration of dissolved elemental water in the canopy of Perennial Cedar and Japanese cypress at 18-year-old precipitation showed that pH and dissolved elemental concentrations of acidic precipitation increased to varying degrees when they penetrated the canopy layer, Cryptomeria japonica is more obvious than Japanese cypress. The increase in the amount of soluble elements in the canopy through the water mainly came from dry sedimentation and canopy leaching. Using multivariate regression model, the dry deposition and crown leaching were separated by the net increment of water soluble elements in the canopy as dependent variable, with no rain duration, precipitation and acidity as the independent variables. The results of the study basically illustrate the water quality characteristics and formation mechanism of crown penetration water.