竹小蜂幼虫空间分布型及其抽样技术研究

对竹小蜂幼虫空间分布型及抽样技术进行研究,结果表明,幼虫种群呈普通聚集分布。在较低密度下,其基本成分是面积为4株楠竹大小的个体群。个体间相互吸引。进行化学防治以后,对种群的空间分布型无影响。但因种群密度降低而使种群聚集程度提高。幼虫在竹梢中部的分布显著不同于上部,而与下部无显著差异。在株内取样调查时,以竹梢中部为最佳:进行样地调查时,以双对角线法取样为最佳。

SPATIAL DISTRIBUTION PATTERNS OF BAMBOO EURYTOMID AND TQRYMID LARVAE AND THEIR SAMPLING TECHNIQUES

Spatial distribution patterns of the larvae of bamboo eurytomid and bamboo torymid and their sampling techniques have been studied. The results indicate that the spatial distribution pattern of the larvae is a common aggregational distribution. Under the lower density condition, the basic composition of distribution is the individual group inhabiting an area for four bamboos to grow, and the individuals attract each other. Chemical control does not influence the spatial distribution patterns of larvae, but as it has reduced the population density, the aggregational level of the larvae is raised.The larvae dist ribution in the middle part of the bamboo crown differs greatly from in the upper part, but there is no significant difference between the middle and lower part. When branches are sampled, the best sampling position is the middle of the bamboo crown; When a plot is sampled, the method of double diagonal lines is the best.