汾河河漫滩三种草本植物群落的生物量研究

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

草本群落是汾河河漫滩的主要植被类型。在对汾河河漫滩植被全面调查的基础上选择了 3种广泛分布的典型群落 :北水苦荬群落、水莎草 +狼把草群落和苔草群落 ,用收获法对它们的生物量进行了研究。研究结果表明 ,这 3种群落的总生物量分别为 785.9g/ m2 、4 94 .6g/ m2 和 34 5.5g/ m2 ,与其它草地群落相比 ,大于荒漠草地和典型草原 ,小于草甸草原。各群落的建群种或共建种的生物量占群落总生物量和各群落地上部分和地下部分生物量的比例均大于 70 %。北水苦荬群落和水莎草 +狼把草群落的地上部分生物量 >地下部分生物量 ,苔草群落的地上部分生物量 <地下部分生物量。另外 ,通过对群落特征、干鲜重比率以及群落生物量的综合分析得出 ,水因子是影响湿地植被群落结构、组成和生物量的主导因子 ,这

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.