景东县云南松毛虫生物生态学特性研究

研究了云南松毛虫(DendrolimushouiLajonquière)的生物学特性及发生与林分因子的相关性。结果表明:云南松毛虫在景东县1年2代,以2,3龄幼虫越冬。幼虫和蛹的空间分布均为聚集分布。采用逐步回归分析法,筛选出影响云南松毛虫发生的5个关键因子:海拔高度、坡向、开阔度、林分结构、土壤综合肥力。总结了虫源地林分和有虫不成灾林分的特点,虫源地林分特征为海拔小于1550m,阳坡或半阴半阳坡、开阔度小、土壤综合肥力差、纯林;有虫不成灾林分特征为海拔大于1550m,阴坡、大开阔度、土壤综合肥力良好、混交林。

A study on the bio-ecological characteristics of Dendrolimus houi in Jingdong County

This article studied the biological characteristics and relationship between forest factors and occurrence of D.houi.The results show that D.houi has two generation each year in Jingdong County and spends its winter by the second and third stadia larvae.The spatial distribution patterns of larvae and pupae are congregating distribution.By using the stepwise-regression method,altitude,direction of slope,open degree,forest structure,comprehensive fertility of soil are selected out as the five key factors which have affected occurrence of D.houi.The characteristics of the pest-resource stand and the stand with pests but without disaster have been summarized.The characteristics of the pest-resource stand are that altitude is smaller than 1 550 m,southern slope or east or west slope,small open degree,bad comprehensive fertility of soil and pure forest;The characteristics of the stand with pests but without disaster are that altitude is bigger than 1 550 m,northern slope,big open degree,good comprehensive fertility of soil and compound forest.