Study on Biomass Changes of Plant Ecological Type Groups in the Leymus chinensis Communities along Northeast China Transect

Plant function types are basic unit in studying vegetation changes and ecosystem function of biodiversity.By now,there has not been a widely accepted class of plant function types.We analyzed the relations of plant ecological type groups and community biomass and environment changes in the grassland communities of Leymus chinensis as edificator along Northeast China Transect(NECT).The results showed that the primary productivity of Leymus chinensis communities was decided first by Xero-mesophytes,and next by Meso-xerophytes and Xerophytes.Mesophytes played an important role only in Leymus chinensis and herbage community.Hygrophytes appeared in several communities.The variance coefficients of Xero-mesophytes and Xerophytes were lower than those of other ecological type groups,therefore the stability of Xero-mesophytes and Xerophytes biomass was higher.