锡林郭勒盟不同草原类型植物群落多样性初步研究

Primary Study on the Plant Communities Diversity in XiLinGuole Grassland

应用双指示种分析法TWINSPAN(Two-Way Indicators Species Analysis,TWINSPAN)和无偏对应分析DCA(Detrended Correspondence Analysis,DCA)对2005年7月中旬在锡林郭勒盟不同草原类型下采集的32个样方进行分类和排序处理。研究结果表明:1)研究区依据水分的差异包括3个不同草原类型(荒漠草原、典型草原、草甸草原),再依据热量和人为干扰的差异包括8个植物群落类型;2)草原植物群落多样性随荒漠草原-典型草原-草甸草原的变化而增加;在中度干扰下,草原植物群落比原生群落具有更高的多样性;不同草原类型过渡带的草原植物群落结构多样性比物种多样性明显。

Used the methods of TWINSPAN（Two-Way Indicators Species Analysis,TWINSPAN）and DCA（Detrended Correspondence Analysis,DCA）dealt with the data which were observer on 32 sits in the middle of july,2005.The result indicated that ：1,The area contains three grassland types-the steppe-desert steppe-typical meadow based on the difference of water,then according to the difference of heat and disturbance,it also contains 8 plant communities;2,Plant community diversity increases along the steppe-desert steppe-typical meadow,Plant communities are more diverse than prime community with intermediate disturance,Conmmunities structure diversity increase stronger than biodiversity in the ecoton.