Momoge is a typical alkaline wetland in Songnen Plain. Although the Momoge wetland serves as a
vital habitat in the global flyway of white crane ( Grus leucogeranus ), the changes of vegetation
composition and related environmental factors in this region during its degradation remain unclear. Based
on the vegetation survey and soil sampling in the field, Two-Way Indicator Species Analysis
(TWINSPAN) and Detrended Correspondence Analysis (DCA) were used to classify the vegetation.
Detrended Canonical Correspondence Analysis (DCCA) was also used to explore the relationship between
vegetation composition and environmental factors. The results are: vegetation in the Momoge wetland is
classified into nine types, i. e. Leymus chinensis community, Polygonum hydropiper community, Scirpus
planiculmis community, Potentilla anserina community, Phragmites australis community, Digitaria
ciliaris community, Setaria viridis community, Chloris virgata community and Artemisia sp. community,
of which the C. virgata community and the Artemisia sp. community are of high prevalence. Vegetation in
the Momoge wetland is dominated by communities of mesophytes, indicating that degradation is ongoing
and the vegetation of this wetland can be classified as degraded meadow. The fundamental cause for
vegetation differentiation in this wetland is the change of water regime though soil PH value, conductivity
and the amount of organic matter are identified as the significant environmental factors associated with it.
A certain degree of disturbance caused the prevalence of the C. virgata community, independent of
previous vegetation or over-grazing.