摘要
对黄河源区玛沁县植物群落进行调查,分析和比较了金露梅(Potentilla fruticosa)灌丛、原生小嵩草(Kobresia pygmaea)草地和重度退化小嵩草草地植物群落的多样性指数、丰富度指数、均匀度指数和相似性指数。结果表明:物种多样性指数依次为金露梅灌丛(3.609)>原生草地(3.475)>重度退化草地(2.809);均匀度依次为与原生草地(0.924)>金露梅灌丛(0.918)>重度退化草地(0.778);丰富度指数依次为金露梅灌丛(51)>原生草地(43)>重度退化草地(37);原生草地和重度退化草地的群落相似性系数较高,随着退化程度的加剧,群落的物种组成和优势种发生了很大变化,原生草地的优势种小嵩草的优势度随着退化程度的加剧而逐渐减少。地上生物量:灌丛(197.90 g/m2)>重度退化草地(125.68 g/m2)>原生草地(103.78 g/m2);地下生物量主要分布在0～20 cm的土层中,在20～40 cm的土层分布较少。
Plant communities of Potentilla fruticosa shrub,native Kobresia pygmaea meadow and severely degraded Kobresia pygmaea meadow in Maqin County,which are located at the headwater region of the Yellow River,were investigated.The diversity index,richness,evenness and similarity index of the communities were compared.The results indicated the diversity index was in the order of Potentilla fruticosa shrub（3.609） native Kobresia meadow（3.475） severely degraded meadow（2.809）.Species evenness was ranked by native Kobresia meadow（0.924）Potentilla fruticosa shrub（0.918） severely degraded meadow（0.778）.The species number of Potentilla shrub,native Kobresia meadow and severely degraded Kobresia meadow was 51,43 and 37 respectively.The native Kobresia meadow and severely degraded meadow had high similarity.Species composition and dominance varied with meadow degradation and the dominance of Kobresia pygmaea decreased with degradation.Aboveground biomass was in the order of Potentilla shrub（197.90 g /m2） severe degraded neadow（125.68 g/m2）native Koresia meadow（103.78 g/m2）.Belowground biomass was mainly distributed in the 0-20cm of soil and much less in the 20~40cm of soil.
出处
《青海大学学报（自然科学版）》
2011年第4期14-17,共4页
Journal of Qinghai University(Natural Science)
基金
青海大学中青年科研基金项目(2009-QN-16)
关键词
黄河源区
植物群落
多样性指数
headwater region s of the Yellow River
plant community
diversity index
