Spatial autocorrelation at multi-scale of soil collembolan community in farmland of the Sanjiang Plain, Northeast China

Abstract

Multi鄄scale autocorrelation is one of the fundamental factors in soil animal spatial heterogeneity and spatial co鄄 occurrence patterns. In August and October 2011, collembolan communities were sampled in farmland of the Sanjiang Plain with a history of more than 30 years of cultivation. The sampling field was divided into 100 subsamples through intensive sampling at the nodes of a 10 伊 10 regular grid with 5 m inter鄄sample distances. Global Moran忆s I and Local Moran忆s I indices were used to test the multi鄄scale autocorrelation for abundance of the collembolan community and for abundance of each species. Both indices were calculated with the Open Geoda software platform.We collected 10603.62 individuals / m 2 , belonging to 17 collembolan species, in August, and 38698 individuals / m 2 , belonging to 13 collembolan species, in October. In terms of one鄄way ANOVA analysis, species richness of the collembolan community in August was non鄄 significantly different from that in October, and the abundance of the collembolan community in August was significantly lower than that in October (P < 0.001). According to the results of Global Moran忆s I indices, abundance of collembolan community showed significant positive autocorrelation at 5-50 m in August, whereas the abundance of the collembolan