Abstract:

Abstract: Soil animals were an important composition in agro-ecosystem and played an important role in the course of energy flowing and material cycling. The soil types of farmland in Sanjiang Plain are mainly made up of meadow soil , black soil, white pulp soil and swampy soil. From the view of eco-geography, methods of field sampling and indoor analysis are used to investigating and identifying the soil animals in four representative soil sorts of the Sanjiang Plain. A total of 7031 individuals, 51 sorts soil animals were captured, belonging to 4 phyla，7 classes，16 orders and 39 families, including 3 dominant groups, 8 common groups and 40 rare groups among them. There was obvious difference of soil animals in each site, which mainly manifested that the groups and numbers of macro-soil aminal in meadow soil are the largest while that of macro and meso-micro soil animals in white pulp soil are the smallest. The diversity analysis showed that the macro-soil animal diversity index was the swampy soil >meadow soil > black soil > white pulp soil, correlating positively with abundance and evenness indices,and negatively with dominance index. The diversity index of small and medium sized soil animals had no significant correlation with other indices. High similar degree appeared among soil animals in 4 soil sorts, most of them were middle similar but that between swampy soil and meadow soil was significantly similar.