山西西南部黄土区林地枯落物截持降水的研究

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％～２２０％，沙棘林地１７．６％～１８．７％，虎榛子林地１７．３％～１７５％；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１６４ｍｍ，沙棘１１．０ｍｍ，虎榛子１０．０ｍｍ．

Litter Interception of Forests in Southwestern Shanxi Province

By on site observation,the paper studies on the litter interception of protection forests in the Loess Plateau in the southwestern Shanxi Province.Research and analysis show that:①the litter interception since May to October is 41.8～119.00mm,the interception percentage in forests is 13 5%～17 9% for Robinia pseudoacacia L.,15.4%～22.0% for Pinus tabulaeformis Carr.,17 6%～18 7% for Hippophae rhamnoides,17.3%～17.5% for Ostryopsis davidiana;the interception in June,July and August is bigger than in other months;②the litter interception is positive correlated with the precipitation and throughfall in a rain event,the equation is P c=aP b;the interception rate equation is i=aP b;③the maximum interception in a rain is:8.0mm for Robinia pseudoacacia L.,16.4mm for Pinus tabulaeformis Carr.,11.0mm for Hippophae rhamnoides,10.0mm for Ostryopsis davidiana.