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该文根据定位观测资料分析了林地枯枝落叶物对降水的截留作用．研究结果表明：晋西南黄土区防护林主要林分的林地枯枝落叶物具有很强的截留降水能力，年截留率为：刺槐林地１３．５％～１７．９％，油松林地１５．４％～２２０％，沙棘林地１７．６％～１８．７％，虎榛子林地１７．３％～１７５％；５～１０月份截留量为４１．８～１１９．００ｍｍ．一年之中，６，７，８三个月截留量最多．对于单场降雨，林内降雨量、枯枝落叶物截留量与林外降雨量呈正相关关系，枯枝落叶物截留量与林外降雨量的关系可表示为Ｐｃ＝ａＰｂ；截留率随着降雨量级的增大而减少，截留率与林外降雨的关系表示为ｉ＝ａＰｂ；根据观测可知，对于单场降雨各林分最大截留降雨量分别为：刺槐８．０ｍｍ，油松１６４ｍｍ，沙棘１１．０ｍｍ，虎榛子１０．０ｍｍ．
Based on the observed data, the paper analyzes the interception of forest litter on precipitation. The results showed that the main litter of the forest stand in the southwestern hinterland of Loess Plateau had a strong ability of interception and precipitation, the annual interception rate was 13.5% -17.9% of the locust forest, 15.4% of the Pinus tabulaeformis woodland, ~ 220%, seabuckthorn forest land 17.6% ~ 18.7%, tiger hazelnut forest 17.3% ~ 17 5%; 5 ~ October interception is 41.8 ~ 119.00mm. One year, 6,7,8 three months interception most. For single-field rainfall, there was a positive correlation between rainfall in the forest and interception rainfall, and the relationship between the interception rate and the rainfall outside the forest could be expressed as Pc = aPb. The interception rate decreased with rainfall According to the observation, we can see that the maximum interception rainfall of each locust in a single field rainfall is 8.0mm for Pinus densiflora, 16.4mm for Pinus tabulaeformis, Seabuckthorn 11.0mm, Tiger hazelnut 10.0mm.