苏南丘陵区毛竹林冠截留降雨分布格局

摘要

林冠截留是一个复杂的水文过程,受降水特征及林分特性的影响较大。以北亚热带苏南丘陵地区人工毛竹林(Phyllostachys edulis)为研究对象,利用2007年度各场次降雨观测数据,分析了降雨量和降雨强度与林冠截留降雨的关系,研究了林冠截留过程的特点。结果表明:(1)研究期间共观测到102次降水事件,降水总量为1110.8mm,单次最大降雨量为110.0mm,最小为0.55mm,事件平均降水量为10.89mm,且绝大部分降雨为低雨强、中雨量级的降雨事件。(2)研究期间林冠截留总量为171.72mm,占同期降雨总量的15.46%。单次林冠截留量变幅为0.21—4.55mm,截留率变幅为1.3%—100%,且随林外降雨量的递增,林冠截留率呈现递减的变化趋势,二者的关系用幂函数(I0=117.34P-0.9106)拟合效果较好。(3)在林外次降雨量小于5mm的条件下,事件降雨量占年降雨总量的5.0%,相应的降雨事件频率为9.8%,此时林冠截留量随降雨量的增大而增加,其变幅为0.55—1.9mm,截留量与降雨量的关系用对数函数(I=0.4931 ln(P)+0.9493)进行拟合效果较好;在单场降雨量大于5mm时...

The distribution pattern of precipitation can be changed when it passes through the canopy due to the interception of the forest canopy,which is a complex hydrographical process and is affected by precipitation and forest characteristics.In order to find out the features of canopy interception,the research which used the bamboo(Phyllostachys edulis) as the research object was conducted in the hill areas of southern Jiangsu province,to analyze the rainfall,and the relationship between the rainfall intensity ...

关键词

毛竹; 林冠截留; 降水分配

全文下载

苏南丘陵区毛竹林冠截留降雨分布格局.pdf