摘要
通过对北京市永定河沙地三种人工植被 (梨园、林带、片林 )不同部位的风速、积沙量及其积沙形态特征进行观测与分析 ,比较了不同人工植被防风效益与阻沙效益的差异 .研究结果表明 ,在迎风面 1～ 1 0H范围内片林的防风效能最大 ,为 2 2 % ;在林内距迎风面 1～ 7H范围内梨园防风效能最大 ,为 6 8.8% ;在背风面 1～ 2 0H范围内林带防风效能最大 ,为 32 % .植被阻沙量大小次序为 :梨园 >片林 >林带 .在植被的作用下 ,积沙形态呈现不同的分布规律 .
Based on the observations and investigations on wind speed, sand accumulation and sand accumulation shape at multi position of three types of artificial vegetation, including pear orchard, forest belt and patch forest, this paper analyzes the difference in the efficiency of wind prevention and sand resistance among the three types of artificial vegetation.The results show that: ①the patch forest has the most effective function of wind prevention in 1～10 H from windward side, with the protection ratio of 22%; pear orchard has the most effective function of wind prevention in 1～7 H from windward side, with the protection ratio of 68.8%; forest belt has the effective function of wind prevention in 1～20 H from leeward side, with the protection ratio of 32%. ②The order of the three types of artificial vegetation on sand resistance is forest belt<patch forest<pear orchard.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2004年第2期21-24,共4页
Journal of Beijing Forestry University
基金
北京市自然基金重点项目 ( 80 110 0 3 )资助
关键词
人工植被
防风效益
阻沙效益
artificial vegetation, efficiency of wind prevention, efficiency of sand resistance
