【摘要】 <正> 数量分类是植物群落生态研究中日益广泛应用的方法,但此法在我国多见用于林地(阳含熙,1979、1980;周纪伦,1979;施维德,1983等),在草原植物群落的研究中运用不多,见之于报导的仅有阳含熙对内蒙呼盟羊草草原的研究,有关陇东黄土高原草原更多还原

【Abstract】 The sampling technique of typical zone was adopted and the numerical classification method—Hier-arehical Agglomerate method was made herewith to study the grassland Plant communities of Huanxian County, which was mainly distributed on the hilly land valley of the loess plateau,Eastern part of Gansu. Twelve plant communites were classifies and the results obtainable were in a position to show that the vegetations were somewhat transient gradually from typical-grassland to non-typical-desert grassland stretching from Southeast to Northeast as both the temperature and rainfall are decrea sing throughout the County. The plant for the most part wild-grown on the sunny side of the hill and valley has greater drought resistance than that on the shady side.The paper by the authors is the first using the numerical classification method to study te loess plateau grassland plant eommunites. The results were used in comparison with that of the traditional method and all those advantages encountered when usin gtne hier-arehieal agglomerate method were discussed accordingly.更多还原