居竹伪角蚜及其3种主要天敌的空间格局研究

对危害孝顺竹Bambusa multiplex的居竹伪角蚜Pseudoregma bambusicola及其3种主要天敌的卒间分布进行调查,聚集度指标表明竹蚜在竹林问为聚集分布,其种群密度在一定时间内较为稳定.天敌蚜厌蝶Taraka hama-da、赤星瓢虫Lemnia sauciaia和食蚜虻Asilichae.sp.在竹林中主要符合负二项式分布和P-E核心分布,为小均匀的聚集分布,存在由点片向四周扩散的现象,频次分析和聚集度指标的分析结果基本一致,其中瓢虫的聚集程度不及另外2种天敌的明显.对竹蚜和天敌的相关关系分析表明,仪食蚜虻的分布与竹蚜之间表现为负相关(r=-0.6341),食蚜虻的活动受蚜群分布的影响最大,而其余2种天敌的取食范围不受限制.

The studies on spatial distribution of bamboo aphid (Pseudoregma bambusicola) and its three natural enemies

The spatial distribution of bamboo aphids ( Pseudoregma bambusicola) and its three natural enemies were investigated from the infested one-year-old bamboos (Bambusa multiplex). Results indicated that aphids fed on fresh bamboos by aggregately distributing, and their predators in bamboo forests were separately collected in different parts, main of which were in accord with negative binomial distribution and Polya - Eggenberger distribution, it was proved that some natural enemies in some sample sites were spraying extensively from single plot to around places, the population density of bamboo aphids was proved to be stable in a regular time. The statistical correlation analysis between aphids and their predators showed that only the syrphids' movement was mostly affected by the distribution of aphids, displaying negative correlation (r = -0. 6341 ) , the other two feeders were barely influenced by aphids.