辽东山区不同林型降雨截留的研究

A Study on the Interception of Precipitation by the Different Kinds of Forest in the East Mountain Area, Liaoning

本项研究测定了辽宁东部山区5个主要林分类型的林冠截留。结果表明:针叶林由于具有轮生枝,枝叶密厚,其林冠截留率均大于阔叶林。各林型的截留率分别为红松林24.1％,油松林22.8％,落叶松林20.4％,杂木林17.4％,柞木林17.2％。5种林分的树干迳流量占总降雨量的百分比均在1％以内。截留量随降雨量的增加而增大,但增加到一定程度后,再增加降雨量,截留数量只有微小的变化。而截留率随降雨量的增加而减小。降雨强度直接影响林冠截留量,降雨强度越大,截留量越小,降雨强度对阔叶林截留的影响大于针叶林。

Interception of precipitation by five different kinds of forest were measured in the east mountain area in Liaoning. For each stand the measurements were made of gross precipitation, through fall and stemflow. For the growing season, interception losses in the pine korean, Japanese larch, Chinese pine. broadleaved forest and Mongolian oak were 24.1. 20. 4, 22.8. 17.4. 17.2 percent of gross precipitation respectively. The stemflows of five kinds of forest were less than 1 percent. The interception losses were increasing as the rainfall increased, but they increased a little while the rainfall exceeded certain amount. The intercept, ion losses deceased while the rainfall intensity increased. The influence of rainfall intensity on broad—leaved forest was greater than that on coniferous forest.