间作苜蓿棉田节肢动物群落结构及时间格局

应用多样性指数、均匀性指数、丰富度、主分量分析方法和最优分割法,研究了不同时期敦煌间作苜蓿棉田节肢动物群落结构及时间格局。结果表明,间作苜蓿棉田节肢动物群落的物种丰富度、多样性和均匀性指数在时间过程中的变化有明显的差异性和规律性。在时间变化过程中,影响节肢动物群落的主导因素和时间格局分化明显,将间作苜蓿棉田节肢动物群落在时间动态中的变化分为5个阶段,并结合气候、物候变化,分析了各阶段内主要害虫和天敌的发生特点。

Community structure and temporal pattern of arthropods in cotton-alfalfa intercrop field

The methods of diversity exponent, evenness exponent, richness, principal component analysis and optimal sorting method were used to study the community structure and temporal pattern of arthropods in cotton-alfalfa intercrop in Dunhuang. The results showed that the difference and regularity of changes in species richness, diversity and evenness of arthropod community at different time were obvious. The main factors and temporal patterns which influenced arthropod community in the course of time change divided obviously. Based on the results, the temporal patterns of arthropod community in cotton-alfalfa intercrop field was divided into five stages. Considering the climatic and phonological development, the occurring characteristics of the pests and the natural enemies occurring in each stage were analyzed.