[Effect of effective microorganisms (EM)compost on micro- and medium-sized soil faunal communities in black soil farmland.].

In May, July and September 2012, four treatment plots with different concentrations of effective microorganisms (EM) compost were established (control, low, medium, and high concentration) in a typical black soil farmland in Harbin. We investigated the effects of different EM compost concentrations on the composition, vertical structure, seasonal dynamics, and diversity of micro- and medium-sized soil faunal communities. A total of 7860 individuals (with the average density of 49125 ind·m) were captured which were classified into 30 groups, belonging to ten classes and three orders.