油茶尺蛾幼虫空间分布格局及抽样技术的研究

近年来，油茶尺蛾（Biston marginata Shiraki）已成为广东省中山市阔叶混交林的重要害虫。通过对油茶尺蛾幼虫在林间的空间分布格局和抽样方法的研究，结果表明：7种抽样调查方法均可用于油茶尺蛾幼虫虫口密度的调查，其中z字形法为最佳的抽样方法。坡位、坡向、树种和树冠方位对幼虫的分布有显著影响。上坡的幼虫密度显著高于中坡和下坡；南坡的幼虫密度显著高于其它坡向。油茶尺蛾幼虫在林间的分布符合负二项分布，空间分布属聚集分布，个体间相互吸引，分布的基本成分为个体群。以1wao回归模型为基础，确定了最佳的抽样模型。

The Spatial Distribution Pattern and Sampling Technique of Biston marginata Shiraki

Biston marginata Shiraki was an important pest of broad-leaved and broad-leaved mixed forests in Zhongshan city of Guangdong province in recent years. The distribution-model and sample methods were re- seached. The results showed that seven kinds of sample methods can be used to investigate the larvae population density, and the Z-shaped method was found to be the best. The population density of the larvae was significant difference among different position of the mountain, or different kinds of trees, or different position, of a tree crown. The larvae population density on the top or on the southern slope of the mountain were largest among different posi- tion of the mountain. The spatial patterns of the larvae in the plantation were conformed to negative binomial distri- bution. The distribution of the larvae exhibited an aggregation pattern. Their Iwao regression equation showed that the larva on the trees was mutual attraction, and the distribution of the basic ingredients was the individual group. The sampling quantity model of the larvae was presented on the base of the Iwao＇s model.