马占相思林冠蜘蛛群落的结构分析

用杀灭菊酯喷洒林冠，收集得蜘蛛２６种，１９９只。群落组成以不结网为为主，全年均保持较高数量水平。结网类从４月至１０月成指数曲数下降。４个相似样地上的群落结构显著差异。以ＭａｃＡｒｔｈａｒ分布模型为基础，求出每个种在群落中的数量－时间－空间的重要值。结果以斜蛛的ＮＴＤ为最，斑络新妇幼体为次。蜘蛛－昆虫群落的营养结构在各样地上是一致的。蜘蛛作为捕食者，占总数１２－１５％。

ANALYSIS OF THE SPIDER COMMLMTY STRUCTURE OF FROM THE CANOPY OF ACACIA MANGIUM

The Fenvalerate was sprayed in the forest canopy for collecting method. There were 199 spiders in the collection. They belong to 11 familles and 26 species. Fifteen species of them were web-non-woven as a main group in the spider conimunity. The community structures in 4 similar plots were not significantly different. The number of species of web-woven descened according to index curve from Aoril to October. The number of species and indviduals of the web-nonwoven were highest in July and it kept in fsitly level during other time.The analysing method of species importances in community:The species importance values were calculated according to MacArthur model,but all numbers of every species caught monthly were mixed to arrange in order from big to small. The species importance value was a totality of importance values monthly.then mixed with the factor of homogeneity in horizontal distribution, and the importance values(NTD)were tried out. NTD was inluding both factors:time and space on qaantity.Result:Cay oes serfatus took the leading place in three aspects,so it was a dominant;Nephila niaenlata(germling) temporally took me leading place in the quantity, so it was put in second order.The trophic structure of spider insect community in the plots was homogeneous. The spiders, predators in community.made up 12-15(?) oftotal individual numbers.