紫花针茅-2021.2.7

选择青海湖地区典型紫花针茅草原作为研究对象,以大量的样方调查为基础,采用等级聚类、TWINSPAN（two-way indicator species analysis）、DCA（detrended correspondence analysis）、CCA（canonical correspondence analysis）、物种多样性,相关分析等多元数量分析方法,系统研究了紫花针茅草原的群落特征、物种多样性、群落与环境因子的关系。结果表明,所调查的紫花针茅草原是物种组成相对较简单、菊科和禾本科植物最多、北温带分布的属为主体的草原群落。青海湖地区的紫花针茅草原群落可分为4个群丛类型：紫花针茅＋多枝黄芪群丛,紫花针茅＋矮嵩草群丛,紫花针茅＋西北针茅群丛和紫花针茅＋川青早熟禾群丛。影响青海湖地区紫花针茅草原群丛分布的主要环境因子首先是以年均降雨量和年均温为代表的气候因子,其次是土壤水分、有机质和全氮磷钾等土壤因子。该区紫花针茅草原群丛均匀度指数和Simpson指数的变化趋势基本一致,紫花针茅＋川青早熟禾群丛是各群丛中最高的。物种丰富度受气候和土壤因子的影响大,但Simpson指数和均匀度指数与所调查的所有环境因子都没有显著相关性。本研究揭示了紫花针茅草原群落的内在规律,对维护青海湖地区生态系统平衡具有重要意义。
The classification,association and distribution characteristics and relationships between the distributions and environmental factors of Stipapurpureasteppe in the Qinghai Lake region were studied.A combined transect and quadrat method was used to collect field data.Multivariate statistical methods,including cluster analysis,TWINSPAN（two-way indicator species analysis）,DCA（detrended correspondence analysis）,CCA（canonical correspondence analysis）and correlation analysis,were used to calculate the data on the basis of investigating a large number of vegetation communities in this region.The species composition of S.purpureain the study area was relatively simple.The dominant families of seed plants were Gramineae and Compositae,and the dominant aerial types of genera were North temperate types.The community in the area could be classified into 4associations：Ass.S.purpurea＋Astragalus polycladus,Ass.S.purpurea＋Kobresia humilis,Ass.S.purpurea＋Poa indattenuata,Ass.S.purpurea＋Sinochasea krylovii.The major environmental factors influencing the distribution of steppe types in the area were first climate factors（mainly average annual precipitation and temperature）,then soil factors（mainly soil moisture,organic matter and N,P,K）.Changes in evenness index and Simpson index of S.purpureastepp associations were basically the same,and the indexes of Ass.S.purpurea＋Poa indattenuata were the highest.Richness index was largely affected by climate and soil factors,but the Simpson index and evenness index of all environmental factors investigated were not significantly correlated with area.The present study provides the ecological parameters of S.purpureasteppe in the Qinghai Lake region and would be a basis for maintaining the ecosystem equilibrium of ecologically fragile zones.
作者岳鹏鹏 卢学峰 叶润蓉 周玉碧 杨仕兵 彭敏
YUE Peng-peng,LU Xue-feng,YE Run-rong,ZHOU Yu-bi,YANG Shi-bing,PENG Min （1. Life Science College, Yulin University, Yulin 719000, China; 2. Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810000, China）
机构地区榆林学院生命科学学院 中国科学院西北高原生物研究所
出处《草业学报》 CSCD 北大核心 2014年第4期10-19,共10页
Acta Prataculturae Sinica
基金陕西省科技厅项目（2011JQ5010） 陕西省教育厅项目（11JK0637） 榆林学院高层次人才项目（11GK07）资助
关键词紫花针茅 数量分类和排序 物种多样性 青藏高原
Stipapurpurea quantitive classification and ordination species diversity Qinghai-Tibet Plateau
分类号S812 [农业科学—草业科学][农业科学—畜牧学][农业科学—畜牧兽医] Q948.158 [生物学—植物学]