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龙胜里骆杉木人工林乔木层林冠年截留率为１５．６％．林下植物层的年截留率为２１．７％（占林外降水量的１８．３％）。降水强度是影响截留量（率）大小的主要因素；同时，林冠的枝叶生长和林下植物盖度的变化对截留量（率）大小也有一定影响．林冠截留量（率）与林外降水量间存在密切的对数关系，而林下植物截留量（率）与林冠降水量或林外降水量之间的函数关系随不同季节而变化，冬春季为幂函数，夏秋季为直线或对数关系，这主要与降水强度有关。乔木层和林下植物层的养分年淋溶归还量为：氮２．４１，钾１２．０５，镁３．５ｌｋｇ／ｈｍ２，钙和磷则为０．其中，乔木层的淋溶量为：氮２．６８，钾８．９８，镁０．７３，磷和钙为０；林下植物层的淋溶量为：磷０．３５，钾３．１０，钙５．９８，镁２．７８，氮为０。植物叶子的养分组成及其养分吸收特点对乔木层和林下植物层的养分淋溶过程有明显的影响。
Longshengliou fir plantation tree layer forest canopy retention rate was 15.6%. Annual afforestation rate of understory plant layer was 21.7% (accounting for 18.3% of precipitation outside the forest). Precipitation intensity is the main factor affecting the size of interception (rate); at the same time, changes of branch and leaf canopy growth and understory plant coverage also have an impact on the interception rate (rate). There is a close logarithm relationship between canopy interception rate and precipitation outside the forest, while the functional relationship between undergrowth interception rate (canopy) and canopy precipitation or outside forest precipitation varies with different seasons. In winter and spring For the power function, summer and autumn as a straight line or logarithmic relationship, which is mainly related to precipitation intensity. Nutrient leaching returns of arborous layer and understory plant layer were: N 2.41, P 12.05, Mg 3.5 lkg / hm2, Ca and P 0. Among them, the leaching amount of arbor layer was 2.68 for nitrogen, 8.98 for potassium and 0.73 for magnesium, and 0 for phosphorus and calcium. The leaching amount of plant layer was 0.35 for phosphorus and 3.10 for potassium , Calcium 5.98, magnesium 2.78, nitrogen 0. The nutrient composition and nutrient absorption characteristics of plant leaves have significant effects on the nutrient leaching process in the arbor layer and understory plant layer.