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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。
The citrus canopy placed in three-dimensional space of 24 sub-regions to examine the relationship between the communities of insects. The results showed that the composition of insect community differed greatly among the upper, middle, lower, inner and outer layers of the canopy, but slightly different in the east, south, west, north and south. By cluster analysis, the canopy insect community is divided into three sub-layers, namely positive sub-layer, neutral sub-layer and negative sub-layer. The results suggest that in the sampling investigation of canopy insect community, we should select the middle of the southwest of the crown, the lower middle of the southeast, northwest and northeast of 4 points, indicating that the past four azimuths were poorly represented. The division of sub-layer provides an important theoretical basis for the management of insect communities.