立地环境因素对桉树地下害虫危害的影响及预测

The Effect and Forecast on Site Factor on the Damage of Eucalyptos

本文探讨了立地环境因素与蓝桉、直干桉人工林地下害虫种类、分布及危害程度的关系。用数量化（Ⅰ）方法的数学模型将各种立地环境定性因素转化为定量因素，进行了立地环境因素对桉树地下害虫发生危害程度影响的分析，判断出影响新造林地桉树地下害虫发生危害的主要因素是海拔高度、土壤类型与桉树树种也有一定的关系。而林分结构和坡向对地下害虫的发生危害影响作用较小。采用建立的预测模型来估测不同生态环境条件下的桉树新造林地下害虫的发生危害程度。

This paper discusses the relations between the site factors and the species of subter-ranean pest of Eucalyptus globulus and E.maidenii,distribution and damages with the modelof quantitative(Ⅰ) method,transform diffrent qualitative site factors into quantitative,andanalyse the effect on site factor to subterranean pest of Eucalyptus,and judged the main fa一ctor which new planting site effected by subterranean pest,also relations with the height of el-evation, the type of soil, and the species of Eucalyptus.The effect which stand stn1cture andaspect on damages of subterranean pest is small。