淮北棉田节肢动物的群落结构

应用多样性指数、均匀性指数、优势度、排序和聚类分析的方法研究了不同时期淮北棉田节肢动物的群落结构。结果表明 ,棉花生长前期优势种不突出 ,多样性指数、均匀性指数均较大 ,后期棉蚜发生量大 ,优势度高 ,多样性指数和均匀性指数降低。发生种类和数量与棉花生育期密切相关 ,棉花苗期害虫及天敌数量较少 ,花铃期较丰富

Community structures of arthropods in cotton fields in the northern of Anhui

The methods of diversity exponent, evenness exponent, dominance,collating and classifing analysis were used to study the community structure of arthopods in different periods in cotton fields in the northern of Arhui. The results showed that the dominance was not obvious,and diversity exponent and evenness exponent were higher during the prophase of cotton growth compared with more cotton aphides during anaphase. The species and number of arthropods were found to be closely related with cotton growth periods. Compared with the ball period of cotton, the number of pests and their natural enemies were less during the shoot period of cotton.