人工草地光稃香草群落结构及其物种多样性分析

Analysis of structure andspecies diversity of Hierochloe glabra Trin.community in artificial grassland

【目的】为探明青海省果洛藏族自治州大武滩不同人工草地光稃香草群落结构和物种多样性变化。【方法】以4个不同人工草地的光稃香草群落为研究对象,分析了物种组成、重要值和多样性指数。【结果】结果表明,4个群落共有23种植物,属15科22属,不同样地的优势种和共优势种植物分别为麦宾草+光稃香草、麦宾草+草地早熟禾+光稃香草、草地早熟禾+光稃香草+短穗兔耳草、草地早熟禾+垂穗披碱草+光稃香草。Simpson多样性指数、Pielou均匀度指数和优势度指数均表现为样地1光稃香草+麦宾草群落最小,其余各样地多样性指数相差不大。样地3群落地上生物量最大,为809.33 g/m^(2),地上生物量较样地1、2和样地4分别提高了10.36%、68.61%和52.13%差异显著。【结论】因此优势种的不同是驱动草本植物群落结构及其多样性和生物量变化的重要因素。

[Objective]To investigate the community structure and species diversity of Hierochloe glabra Trin.in different artificial grasslands in Dabutan,Guoluo Tibetan Autonomous Prefecture,Qinghai Province.[Methods]This study focuses on the species composition,importance values,and diversity indices of four different artificial grassland communities of Hierochloe glabra Trin.[Results]The results show that there are a total of 23 species of plants in the 4 communities,belonging to 15 families and 22 genera.The dominant and co dominant species of plants in different areas are Elymus tangutorum(Nevski)Hand.-Mazz+Hierochloe glabra Trin.,Elymus tangutorum(Nevski)Hand.-Mazz.+Poa pratensis L.+Hierochloe glabra Trin.,Poa pratensis L.+Hierochloe glabra Trin.+Lagotis brachystachya Maxim.,Poa pratensis L.+Hierochloe glabra Trin.+Elymus nutans Griseb.,The Simpson diversity index,Pielou evenness index,and dominance index all show as sample plot 1 Elymus tangutorum(Nevski)Hand.-Mazz+Hierochloe glabra Trin.Community minimum,there is not much difference in diversity indices among other various regions.The maximum aboveground biomass of sample plot 3 was 809.33 g/m^(2),with a significant increase of 10.36%,68.61%,and 52.13%compared to sample plots 1,2,and 4,respectively.[Conclusion]Therefore,the difference in dominant species is an important factor driving changes in the structure,diversity,and biomass of herbaceous plant communities.