大武地区不同程度退化草地群落结构及植物量分析

通过对大武地区小嵩草草甸的研究,分析了不同程度退化草地群落结构和地上、地下植物量的变化。结果表明:随着退化程度的加重,群落的组成和优势种发生了很大的变化,植物群落从以莎草科为主,向以杂类草为主的群落演替;地上、地下植物量均呈现下降趋势,而杂类草的地上生物量则表现出逐渐增加的趋势。几种不同程度退化草地的地下植物量主要分布在0~10cm的范围内,且显著高于其它层;物种多样性、均匀度指数有下降趋势。

Analysis of Community Structure and Biomass among Grasslands with Different Degraded Level in Dawu region

The change of the community structure and aboveground biomass and underground biomass in the grasslands with different degraded level was analysed on the basis of study of Kobresia parva meadow in Dawu region. The results showed that the dominant species and components of the community were changed by the aggervation of degraded degree. The plant community changed from that the sedge family was dominant community to that the weed was dominant commumnnity; the abovegound biomass and underground biomass were a tendenct of decrease, and the weed was the tendency of increasing;the underground biomass mainly distributed at the soil scale of 0- 10cm; the diversity index and evenness indexd were the tendemev of decrease.