白音锡勒牧场草原植物群落的数量分析

采用双向指示种分析（Two—Way Indicator Species Analysis，TWINSPAN）和无趋势对应分析（Detrended Correspondence Analysis，DCA）技术，对白音锡勒牧场2004年和2005年的48个样点的草原植物群落调查数据进行分析。结果表明：1．TWINSAN分类与DCA排序具有高度的一致性，吻合度达83％，输出结果准确可信；2．研究区域有草甸草原和典型草原两种草原类型，其中在典型草原内可划分为五个植物群落类型，即1）大针茅（Stipa grandis）＋羊草（Leymus chinensis）＋糙隐子草（Cleistogenes squarrosa）群落；2）克氏针茅（Stipa krylovii）＋糙隐子草（Cleistogenes squarrosa）＋冰草（Agropyron cirstatum）群落；3）冷蒿（Artemisia frigida）＋糙隐子草（Cleistogenes squarrosa）＋大针茅（Stipa grandis）群落；4）糙隐子草（Cleistogenes squarrosa）＋冷蒿（Artemisia frigida）＋一、二年生植物（annual—biennial）群落；5）星毛委陵菜（Potentilla tanacetifolia）＋糙隐子草（Cleistogenes squarrosa）＋一、二年生植物（annual-biennial）群落，这五个植物群落类型反映了典型草原植物群落退化演替序列；3．研究区不同植物群落类型的物种数量、生态种组类型等不同。冷蒿（Artemisia frigida）＋糙隐子草（Cleistogenes squarrosa）＋大针茅（Stipa grandis）群落为研究区植物群落退化演替中的中度退化阶段，物种数量最多，生态种组类型最多，样点间差异较大。

THE NUMBER ANALYSIS OF GRASSLAND PLANT COMMUNITY OF BAI YIN LE PASTURE

The Two-Way Indicator Species Analysis and Detrended Correspondence Analysis technology were adopted to analyze the survey data of 48 sampling sites of grassland plant community in 2004 and 2005.The result showed that the classification of TWINSA and ranking of DCA had identical and coincidence rate could reach 83%.There were two types of grassland in studying areas,including meadow grassland and typical grassland.Among of which,there were five types of plant community in typical grassland.