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本文对十七年生的固沙林固沙效益进行了分析测定。为研究固定沙地植物群落演替种间联结,1983年在固定沙地内设置永久样方40块,通过1983、2001和2007年三次调查和重要值比较说明榆林固沙实验林基地植物群落在1983-2007年20多年间演替状况。利用数理统计方法对踏郎与多年生植物种进行了种间联结和联结系数的计算表明:踏郎是优良固沙树种,但不宜营造混交林,尤其是同科的紫穗槐、花棒、柠条,它们之间为负联结,相互排斥严重,猫头刺的迅速死亡消失与踏郎地排斥密切相关。是选择固沙树种应该注意的重要问题。
This paper analyzes the determination of the benefits of sand fixation for 17 years old. In order to study the succession interspecific association of plant communities in sandy land, 40 permanent plots were set up in the fixed sandy land in 1983. The comparison of three important values in 1983, 2001, 2007 20 years of succession. Based on the mathematical statistics, the interspecific association and linkage coefficient between Tialang and perennial species were studied. The results showed that Tialang was an excellent sand fixation species, but not suitable for mixed forest, especially Amorpha fruticosa, , Negative connection between them, mutually exclusive, cat-headed rapid disappearance of death and scruples are closely related. It is an important issue that should be noticed when choosing sand fixation species.