A study on the change of spatial pattern of wetland in the Sanjiang Plain Spatial autocorrelation at multi-scale of soil collembolan community in farmland of the Sanjiang Plain, Northeast China Relative contributions of environmental filtering and dispersal limitation in species co-occurrence of above- and below-ground soil mite communities The biodiversity conservation value of wetland ecosystem in the Sanjiang Plain Influence of Plants on CO2 and CH4 Emission in Wetland Ecosystem Dew condensation rules in farmland ecosystem in Sanjiang Plain The patch characteristics of wetland remnants in the Sanjiang Plain and its influence on plant species richness