棉蚜和小枕异绒螨幼螨空间格局研究初报

ON THE SPATIAL PATTERNS OF APHIS GOSSYPII GLOVER (HOMOPOTERA:APHIDIDAE) AND PREDUTORY MITE ALLOTHROMBIUM PULUINUM LARVAE IN COTTON FIELDS

本文通过聚集度指标测定以及Ｉｗａｏ＇ｓＭ－ｘ线性回归模型及其改进模型和Ｔａｙｌｏｒ＇ｓ幂回归模型分析，结果表明棉蚜、小枕异绒螨幼螨及其寄生棉蚜的个体间均相互吸引，空间格局的基本成份均系个体群，在低密度下，个体群均呈普通聚集格局；聚集速率均随种群密度的提高而下降，顺序为小枕异绒螨幼螨＞棉蚜＞被寄生棉蚜；但在一切条件下，其聚集强度均随种群密度的提高而加强，顺序为棉蚜＞小枕异绒螨幼螨＞被寄生棉蚜。本文末分析了棉蚜、小枕异绒螨幼螨及其寄生棉蚜在棉田内的聚集原因和内在关系。

The spatial patterns of Aphis gossypii and Allothrombium puluinum larvae and A.gossypii, parasitized by A.puluinum larvae in cotton fields were measured by the aggregation degree indices and the onalysis of model of Iwao's - straight line regression and the model of improved Iwao's - curve line regression, and the model of Taylor's power regression in this paper. The resalts showed that the individuales of A.gossypii, A.puluinum larvae and A.gossypii, parasitized by A.puluinum larvae attracted reciprocal. The bosic component of the spatial patterns of A.gossypii, A.puluinum larvae and A.gossypii parasitized by A.puluinum larvae were all the colong. Under lower density, the colonies were all common aggregation patterns. The relative aggregation rate decreased with increase of the population density, and the order was A.puluinum larvac> A.gossypii> A.gossypii , parasitized by A.puluinum larvae. But under all density, the aggregation degree raised with increase of the population density, and the order was A.gossypii>A.puluinum larvae> A.gossypii , parasitized by A.puluinum larvae. The aggregation cause and its inkerent relationship of A.gossypii, A.puluinum larvae and A.gossypii , parasitized by A.puluinum larvae in cotton fields were analyzed at the end of this artide.