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Studies on the biomass of three herb communities in flood plain of Fen river, Taiyuan

SHANGGUAN Tie liang 1, JIA Zhi li 2, ZHANG Hong 1, YANG Li hong 1 (1.Department of Environment, Shanxi University, Taiyuan 030006, China; 2.Institute of Scientific and Technical Information of Taiyuan, Taiyuan 030002, China)  
Herb community is the major vegetation type in flood plain of Fen river. In this paper, the biomass of 3 types of herb communities, such as Veronica aquatica community, Juncellus serotinus+Bidens tripartita community, Carex spp. community, were investigated with harvest method. The results showed that the biomass of these 3 types of herb community were 785.9 g/m 2, 494.6 g/m 2 and 345.5 g/m 2 respectively. Comparing with other types of grassland, this biomass of floodplain of Fen river is bigger than the typical steppe and desert grassland, and smaller than meadow grassland. The biomass of edificator or co edificator accounted for 70% of the community in terms of the total or the underground or the aboveground biomass. Aboveground biomass of Veronica aquatica community, Juncellus serotinus+Bidens tripartita community is bigger than that of the underground; Aboveground biomass of Carex spp. community is smaller than that of underground. In addition, it is obtained that water is the dominant factor impacting the structure, composition, biomass of community by comprehensively analysis the character of community, the proportion of dry and fresh weight and biomass. The distribution of these three communities obviously showed water ecological gradient.
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