两种麦蚜空间生态位的系统研究

Systematical Study on Spatial Niche of Two Wheat Aphids

对麦长管蚜、二叉蚜空间生态位进行系统研究，结果表明，长管蚜的生态宽度随着时间推移逐渐变窄，其变化速度大于二叉蚜；长管蚜重迭于二叉蚜的生态位，重迭指数随着时间推移逐渐变小；而二叉蚜重迭于长管蚜的生态位，重迭指数随着时间推移逐渐变大；４月８日以后两种麦蚜生态位相似性比较指数大于０．６２７３，最大为０．８４６３。

The spatial niche of both Macrosiphum granarim and Schizaphis graminum was systematically studied.The result showed that:(1) The niche breadth of these two aphids became narrower and narrower over time,but the change of Macrosiphum granarim's was quicker than that of Schizaphis graminum's.(2) The two wheat aphids overlapped each other's niche partly,but the change trend of their overlap index over time was opposite.(3) Comparative index of ecological similarity in the two wheat aphids was more than 0 6273 after the date of eighth of April,the maximum of which came to 0 8463.