民勤县主要治沙造林树种空间结构及其防风作用  

Study on the Tree Spatial Structure and the Wind Break Function on Psammophyte in Minqin County

作　　者：李建刚[1] 王继和[2] 蒋志荣[1] 柴薇薇[1] 

机构地区：[1]甘肃农业大学林学院,兰州730070 [2]甘肃省治沙研究所,甘肃武威733000

出　　处：《水土保持研究》2008年第3期121-124,共4页Research of Soil and Water Conservation

基　　金：国家自然科学基金项目“西北地区沙生植物资源保护与持续利用”

摘　　要：通过对民勤主要治沙造林树种梭梭、柠条、花棒和沙拐枣4种沙生植物空间结构及其防风作用的研究，结果表明：4种沙生植物枝条总数，直径为0～2，2～4,4～6，6～8，8～10mm的枝条数和迎风面宽度随植株高度逐渐增大，达到最大值后随株高逐渐降低，直径〉10mm的枝条随植株高度呈下降趋势；4种沙生植物都具有明显的降低风速作用。且随植株后距离的增大降低风速作用逐渐减弱；植株降低风速作用与枝条阻挡面宽度以及迎风面宽度有密切联系。且随着阻挡宽度和迎风面宽度的增大而增大，迎风面宽度与枝条阻挡面宽度星正相关。The tree spatial structure and the wind break function are studied on psammophyte,such as Holoxylom ammodendron Bunge,Hedysarum scoparium Fiseh. et Mey, Caragana korshinskii Kom and Calligonum mongolicum Turcz which are desertification control afforestation trees. The results showed that the total number of branch,the number of branch which have the diameter between 0-2,2 -4,4-6,6-8,8-10 mm, the windward side width are increasing with the tree height, and when reach the maximum, then reduced. The number of branches whose diameter above on 10 mm declined. The four psammophyte all have the function of weakening wind speed, but the function gradually reduced with the increasing of the distance behind tree. The wind break function has a correlation with barrier side and windward side width. There is a positive correlation between windward side width and barrier side width.

关 键 词：沙生植物 空间结构 防风作用 

分 类 号：S718.512[农业科学—林学] X171.4[环境科学与工程—环境科学]