Studies On Structure And Dynamics Of Arthropod Communities In Spring Wheat Field

Based on the principal of system analysis, the statistical and dynamic characteristics of arthropod communities in spring wheat field were studied:1 The composition structure of arthropod community in spring wheat field of shanxi was made out, and the structure of food web was also primarily cleared.2 The follow effect and control effect of primary predatory enemies on spring wheat aphid were evaluated, accordring to the analysis of their temporad niche, spatial niehe and spatial-temporal two-dimenisional niche. Influenced by winter wheat fields and other facts, the natural controlling capacity in the spring wheat fields is weaker so the general administration should be strengthened.3 The richness, diversity and evenness of arthropod communities in spring wheat field of three different chemical were comapared and the relationship between diversity and evenness was also discussed. It shows that chemicals have some certain effect on diversity of arthropod communities and consequently it can decrease the evenness of communities.4 Hierarchical cluster method was employed to analysis time dynamics of arthropod community in spring wheat field.i.e. arthropod communities in the spring wheat field are from evenness to unevenness and the other way around.5 The sprincipal component analysis was adopted to study the sucession process of arthropod community in spring wheat field the main species and category affected the sucession were found and the major periods of the sucession were explored.i.e arthropod communities with longer time of sustaining, small number and slight fluctuation; Arthropod communities with longer time of sustaining; And arthropod communities with short time of sustaining and peak phase of number-rocketing.6 The basic composition and the main divisions of arthropod communities in JingZhong Spring wheat fields are clear.The richness, indiviaual totality and ecological dominance of arthropod communities in the wheat fields in different chemicals are compared and analyzed.It turns out that these two chemicals have great influence upon the communal structural evenness of the arthropod communities. And the chemicals should be properly used.