Effect of topography heterogeneity on distribution of soil fauna in Songnen grassland
XIN Weidong1,2, YIN Xiuqin1,3, SONG Bo1,4
1. College of Urban and Environmental Sciences, Northeast Normal University, Changchun 130024, China;
2. College of Urban and Environment Sciences, Shanxi Normal University, Linfen 041000, Shanxi, China;
3. Jilin Key Laboratory of Animal Resource Conservation and Utilization, Changchun 130024, China;
4. College of Environment and Planning, Henan University, Kaifeng 475004, Henan, China
Abstract：Distribution of soil fauna was affected by several factors in Songnen grassland,such as topography,soil,vegetation,climate,sampling time and so on.Results showed that there were significant effects of topography on soil fauna in forest ecosystem,but we still do not know the effect of topography heterogeneity on distribution of soil fauna in grassland ecosystem.Five habitats of fixed dune and steppe in Songnen grassland were chosen to investigate soil fauna community characteristics for one year.In this study,we analyzed the characteristics of ecological distribution and biodiversity of soil fauna and measured the interaction of topography heterogeneity and time on distribution of soil fauna by ANOVA for repeated measures.Results showed that the average density of soil fauna was 5144.62 ind·m-2 during research and soil fauna belong to four phyla,eight classes,and 24 groups.Arid and semi-arid regional characteristics of fauna have been shown in species composition of soil fauna.Coleoptera and Orthoptera are the typical fauna in this region.There were significant differences among five habitats in species composition and number of soil fauna.But there are no differences in group composition and number of total soil fauna with time.There were significant differences of dynamics of soil fauna diversity index among habitats.Three habitats in fixed dune with similar diversity index showed significant difference in two habitats in steppe with similar diversity index,and suggested the effects of topography heterogeneity on diversity index of soil fauna.Results of ANOVA showed that there were significant effects of time and topography heterogeneity on characteristics of quantity and diversity of soil fauna community,but the interaction of time and topography heterogeneity on soil fauna community was not always significant.Therefore,topography heterogeneity had significant effects on distribution of soil fauna in Songnen grassland,which may be related to biotic and abiotic characteristics of habitats.