大武滩藏嵩草沼泽化草甸群落结构及植物量调查研究

Investigation on Community Structure and Biomass of Kobresia Tibetica Swamp Meadow in Dawutan

对果洛州大武滩藏嵩草沼泽化草甸典型样地的植物群落结构及植物量进行了调查,结果为:该草地植被由24种植物组成,隶属13科22属。藏嵩草为优势种,次优势种植物有华扁穗草和鹅绒委陵菜。植被多样性指数(H′)为3.06,生态优势度指数(D)为0.82,均匀度指数为(J′)值为0.96。地上植物量干重为558.7g/m2,地下植物量为6734.13g/m2。地下植物量主要分布在0～10cm处,为4071.7g/m2,占0～30cm植物量的60.46%。草地地上植物量按经济类群划分,莎草类、阔叶草类和禾草类植物分别占鲜重的69.9%、26.28%和3.78%;占干重的75.3%、20.3%和4.4%,草地植物群落以莎草科牧草为主。

The cornunity structure and biomass of Kobresia Tibetica swamp meadow in Dawutan of Guoluo prefecture were investigated. The results indicated： There were 24 species, which belongs to 13 families and 22 genera in this plant corranunity. The dominant species was Kobresia Tibetica, and the second dominant species were Blysmus sinocompressus and Potentilla anserine. The Shannon-Wiener index of plants was 3.06,the Simpson index was 0.82,the Pielous index was 0.96. The dry above-ground biomass was 558.7g/m^2, the dry below-ground biomss was 6734.13 g/m^2. The below-ground biomass primarily distributed at the 0 -10cm of soil depth which was 4 071.7g/m^2 and occupied 60.46% of biomoss of the 0 - 30cm soil depth. According to the economic classes, the above-ground biomass divided into Cyperaceae, forbs and Gramineaeis, which occupied69.9%,26.28%and 3.78% of the fresh biomass and 75.3%,20.3% and 4.4% of the dry of biomass, respectively. The main species of this plant community was Cyperaceae.