黄土高原水蚀风蚀交错带降水及灌木林冠截留特性研究  

Characteristics of rainfall and crown interception of shrub in wind-water erosion interleaving region of Loess Plateau

作　　者：霍竹[1] 邵明安[1] 

机构地区：[1]中国科学院地理科学与资源研究所

出　　处：《干旱地区农业研究》2005年第5期88-92,共5页Agricultural Research in the Arid Areas

基　　金：国家自然科学基金(50479063);国家杰出青年基金(40025106);国家重点基础研究发展规划(G2000018605)

摘　　要：黄土高原土壤侵蚀最强烈地区出现于年降水量为400mm左右的水蚀风蚀交错带,沙柳、柠条等灌木是该地区主要的造林树种,在防风固沙、水土保持等方面起着重要的作用。本研究采用在林内外随机放置自制雨量筒测量林内降雨量和林外降雨量的方法研究了雨季灌木林降水及林冠截留特性,得出如下结论:(1)沙柳、柠条林内降水与林外降水呈线性正相关,相关系数分别为0.9985、0.9996;(2)沙柳、柠条林冠截留量与林外降水量呈幂函数关系,相关系数分别为0.8843、0.9187。总体而言,林冠截留率随着林外降水量的增加而减小,相关关系不明显;(3)7、8月份沙柳、柠条林冠截留率小于9月份林冠截留率,且沙柳林冠截留率小于柠条,9月份沙柳林冠截留率大于柠条。The most serious erosion in the Loess Plateau exists in the wind-water erosion interleaving region where the annual precipitation is about 400 mm, The ecological environment is very fragile and water is the limiting factor of environmental restoration in this region. Salix psarnrnophila and Caragana korshinskii are the important shrubs for vegetation construction and play an important role in controlling water and wind erosion. In this paper, the characteristics of precipitation and crown interception have been observed by the method of fixed hyetometer inside and outside of the shrub forest. The results showed that： （1） There was a linear positive correlation between rainfall inside and outside of shrub stands, and the correlation coefficients of Salix psammophila and Caragana korshinskii are 0. 9985 and 0. 9996, respectively, （2） There was a typical power function relationship between crown interception and precipitation, and the correlation coefficients are 0, 8843 and 0. 9187, respectively, The crown interception percentage was reduced with the increase of precipitation, and their correlation wasn＇t obvious. （3） The interception percentages of Salix psammophila and Caragana korshinskii in July and August were higher than those in September, and the interception percentage of Salix psammophila was lower than that of Caragana korshinskii. However, the interception percentage of Salix psammophila was higher than that of Caragana korshinskii in September.

关 键 词：灌木 林冠截留 降水 水蚀风蚀交错带 黄土高原 

分 类 号：S715.2[农业科学—林学]