In the south of the Song-Nen plain there is a temperate semimoist continental climate. The zonal vegetation in this region is meadow steppe. The distribution and combination of plants appear to be controlled mainly by the edaphic condition.
Using qualitative and quantitative analyses, the vegetation can be divided into 11 communities. Based on ordination and biotope analyses, the 11 communities may be grouped into 5 ecological combinations: (1) The salt-alkali tolerant and hygrophilous combination...