柑桔树冠昆虫群落立体结构分析

An Analysis of Community Stereoscopic Structure on Citrus Canopy

将柑桔树冠置于24个分区的立体空间,考察各区之间昆虫群落的亲疏关系。结果表明:昆虫群落组成在树冠上、中、下部及内、外层间差异大,而在东、南,西、北、4方位差异小。通过聚类分析,将树冠昆虫群落划分为3个亚层,即阳性群落亚层、中性群落落亚层和阴性群落亚层。结果认为在进行树冠昆虫群落取样调查时,宜选取树冠西南方偏上,东南方、西北方和东北方偏下的4点中层,从而说明以往4方位取样代表性较差。3亚层的划分为昆虫群落的管理提供了重要理论依据。

Citrus canopy was divided into 24 parts in stereoscopic space in this paper. The relationship of insect community in each part was studied. The results showed that the differences from the upper, middle and lower, inner and outer of citrus canopy were larger than those among the insect communit from all directions (E/S/W/N) of the canopy. Through cluster analysis, the insect communities in canopy were classified into three sub-layers : positive, neuter and negative sub-communities. The results showed that when sampling survey of insect communities of canopy was carried out, it was suitable to select the middle layer of southwest, southeast, northwest and northeast, showing the poor typicality of sampling from four directions. Three sub-community division will provide an important scientific basis for the pest management.