亚菊群落的结构与特征

STRUCTURE AND CHARACTERISTICS OF AJANIA SP.COMMUNITY

在野外调查的基础上,分析了分布于甘肃省皋兰县前长川亚菊群落的种群组成、群落结构及其特征以及生活型组成,共设置样方50个(100cm×100cm)。在该群落中,组成群落的种群一般在13种左右,群落结构相对简单,生活型以一年生植物、地面芽植物和地下芽植物为主,群落中伴生种多为菊科、藜科、蒺藜科和禾本科植物,种类一面积曲线表明,亚菊群落最小面积为100cm×100cm,群落盖度约50%～65%,由于群落内种群组成和群落结构都相对简单,加之群落分布区降雨量小、蒸发量大等不利自然条件,外界的扰动(如过度放牧、火烧等)很容易造成群落盖度的下降和草场质量的退化。若采取设置围栏等保护措施,将有利于草场的保护和环境条件的进一步改善。

The Ajania sp community is one of the main vegetation types in the middle part of Gansu Province.In this paper,the species components,structure of the community and life forms of the populations in the community have been discussed according to field investigations.The structure of the community is simple relatively,Hemicryptophytes and Therophytes are the main life forms,most of the species in the community are xerophyte,for example,Ajania nernatoroba,Ar- tarnisia scoparia,Zygophyllum macronatam,etc.So the steps must be taken to protect this com- munity.