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在鼎湖山马尾松林中,林外降水量年平均为2209.9mm,其中83.8％-84.5％的降水集中在春夏两季,而秋冬两季仅占15.5％-16.2％。林外降水到达林冠重新分配,穿透雨占了82.7％,林冠截留17.2％,茎流0.15％。林外降水进入该生态系统后,34％以径流形式流出,其余的通过蒸散形式返回大气层。林冠截留率随林外降水量的增加而减少,但随着降水的增大,其降幅逐渐减小。茎流率的变化与林冠截留率相似,单株茎流量与胸径和枝下高的大小呈显著的直线关系（P<0.01）,但与林冠大小关系不明显。径流仅发生在每年的4-10月份,年平均径流率为0.34。
In the Pinus massoniana pine forest, the average annual precipitation is 2209.9mm, of which 83.8% -84.5% of precipitation concentrated in spring and summer, autumn and winter, only 15.5% -16.2%. Precipitation outside the forest canopy redistribution, penetrating rain accounted for 82.7%, canopy interception 17.2%, stem flow 0.15%. After rainfall outside the forest enters the ecosystem, 34% of the rainfall is runoff and the rest returns to the atmosphere through evapotranspiration. Canopy interception rate decreases with the increase of precipitation outside the forest, but decreases with decreasing precipitation. The change of stem flow rate was similar to that of canopy. The stem flow of single plant had a significant linear relationship with the diameter at breast height and branch height (P <0.01), but not with the size of canopy. Runoff occurred only in April-October of each year, with an average annual runoff rate of 0.34.