苹果叶螨类群与捕食性天敌类群空间格局的研究

STUDY OF THE SPATIAL PATTERN FOR APPLE LEAF MITES AND PREDATORY NATURAL ENEMIES

本文从群落的角度,研究了成都地区苹果叶螨类群与捕食性天敌类群的空间格局关系及季节变化。结果表明:二者的空间格局在不同时期,不同类群密度下的分布均为聚集分布,捕食性天敌类群的聚集度和类群数量存在对叶螨类群的跟随效应;二者的聚集度指标存在明显的季节变化;对 Waters(1959)λ值测定结果分析,4～7月二者呈聚集分布的原因为类群物种的自身生物学特性或环境条件引起,8月为苹果叶片部分脱落引起。

This paper studied the Spatail Pattern relation between apple leaf mites and their predatory natural enemies and the seasonal change.The results showed that the spatial pattern of both mites and predators always exists in aggregate distrib- ution in different density and in different time;The aggregate strength of predatory natural enemies and their quantity display the follow effect for leat mites,The index of aggregate strength differs evidently from different seasons;Analysing the results by water's λ(1950),We discove that the aggregate distribution in May to July might cause by biological characteristics of kinds or environment and in August lead might by partial fall of apple leaves.