不同密度退耕雷竹春季林冠截留特性

Spring canopy interception characteristics of Phyllostachys praecox cv. Prevernalis stand converted from cropland at different densities

为研究不同密度退耕雷竹春季林冠截留特性，对8个不同林分密度（10800±400、11600±400、13200±400、14800±400、16400±400、20800±400、22400±400和228004-400株·hm-2）的退耕雷竹林进行水文观测。结果表明：不同林分密度雷竹林外降雨与穿透雨、竹秆径流均具有极显著的抛物线函数关系，与林冠截留具有开口向下的抛物线函数关系；8个林分平均林冠截留率变化范围为1．42％～37．58％，林分密度与其最大截留量、平均林冠截留率呈开口向下的抛物线函数关系；当雷竹林分密度为17209株·hm-2时，其平均林冠截留率达到最大31．15％，最大林冠截留潜力为39．07mm；可见，合理的林分密度可充分发挥退耕雷竹林的生态水文效益。

A hydrological observation in Phyllostachys praecox cv. Prevernalis stands converted from croplands at eight different densities （10800±400, 11600±400, 13200±400, 14800±400, 16400±400, 20800±400, 22400±400, 22800±400 individuals per hm2） was carried out to study their canopy interception characteristics. The results showed that the rainfall had a para- bolic relationship with throughfall and stemilow, canopy interception, respectively. The average and had a downward parabolic relationship with rate of canopy interception of the eight stands ranged from 1.42% to 37.58%, and the stand density had a downward parabolic relationship with the maximum canopy interception and average canopy interception rate. At the stand density of 17209 individuals per hm2, the average canopy interception rate was maximum （31. 15% ） and the maximum canopy interception potential was 39.07 ram. Therefore, a proper stand density could fully favor the ecohydrological benefit of P. praecox cv. Prevernalis stands.