Abstract:

【Objective】 In order to research the effect of biodiversity on spatial distribution of Sitobion avenae in wheat, the population density of S. avenae was investigated in wheat fields in Langfang Experimental Station of Institute of Plant Protection, Chinese Academy of Agricultural Sciences, using wheat intercropped with pea by different patterns, and the field cultivar monoculture of wheat was planted as control. 【Method】 Using the Geographical Information System (GIS) and the traditional analysis methods of spatial distribution, the Kriging-interpolation figures, aggregation indices, Iwao and Taylor′s regression models were analyzed. 【Result】 The results showed that the spatial distribution of S. avenae was mainly aggregation distribution in intercropping patterns of wheat and pea, by the planting row of pea : wheat in 2﹕2, 2﹕4, 2﹕6, 2﹕8 and wheat monoculture, but the degrees of aggregation were different, 2﹕2 pattern ＞ 2﹕6 pattern ＞ 2﹕4 pattern ＞ wheat monoculture ＞ 2﹕8 pattern. Kriging-interpolation figures indicated that wheat aphids distributed mainly around the field during early stage, and spreaded to the middle of field gradually. There were many aggregation centers mostly at wheat monoculture and 2﹕2 patterns plots during aphid peak period. Compared with each intercropping field, there were higher population densities of aphid in field cultivar monocultures at the level of P＜0.01. 【Conclusion】 Although the reasonable biodiversity in wheat fields could control the population of wheat aphid effectively, but the spatial distribution did not change.

Key words: geographical information system (GIS), Sitobion avenae, spatial distribution, biodiversity