光肩星天牛虫口密度和空间分布型与抽样方法的数量化分析

NUMERICAL ANALYSIS ON INSECT POPULATION AND SPATIAL DISTRIBUTION PATTERN AND SAMPLING METHODS OF GLABROUS SPOTTED WILLOW BORER

一、问题的提出选择最佳抽样方案对判定昆虫种群空间分布型和提高虫口密度的统计精度具有重要意义.通过在试验林分中,设计若干目标抽样方案,进行多种算法筛选,逼近林分实测值,

The numerical basis of making a forestall and administer plan about Gla- brous Spotted Willow borer is gained from sampling investigation.To assure its degree of accuracy,we must seIect optimum sampling methods.Here we mainly discuss selecting techniques of optimum sampling methods.