摘要
采用聚集指数ｂ值测定，扩散系数（Ｃ）测定，Ｉｗａｏ法测定以及Ｄａｖｉｄ和Ｍｏｏｒｓ聚集指标Ｉ测定４种方法来研究杉木扁长蝽若虫的空间分布型和最适抽样数，结果表明：在不同林地、不同虫口密度情况下，均呈聚集分布。若虫聚集是环境所致。
The spatial distribution patterns of Sinorsillus piliferus nymphae and optimum sampling number were studied by 4 methods of convergence index (b), speading coeffience (c), Iwao test and David and moors's convergence index. The resuts showed that, its distribution type was aggregative in different stands and populations Nymphae's aggregation was caused by environment.
出处
《浙江林业科技》
北大核心
2000年第4期62-65,共4页
Journal of Zhejiang Forestry Science and Technology
关键词
杉木扁长蝽
若虫
空间分布型
最适抽样数
Sinorsillus piliferus
nymphae
spatial distribution pattern
optimum sampling number
