蒙古沙冬青群落组成与结构研究

Composition and Structure of Community of Ammopiptanthus mongolicus in Alasan Left Banner,Inner Mongolia

蒙古沙冬青(Ammopiptanthus.mongolicus)属于古老的第三纪孑遗植物,具有重要学术研究价值.蒙古沙冬青群落是分布在内蒙古西部的典型荒漠群落类型之一.本文通过对阿拉善左旗蒙古沙冬青群落植被状况的调查分析,结果发现,沙冬青群落以藜科、蒺藜科、禾本科、豆科、菊科等植物为主.在群落内部,植物生活型以草本植物为主,占64. 8%;灌木植物次之,占32. 4%.植物生态型主要为旱生植物,占59. 5%.随着海拔高度增加,蒙古沙冬青群落的物种多样性和植被覆盖度逐渐减少.受气候变化和地理环境因素影响,蒙古沙冬青种群呈现老龄化,分布面积有缩小趋势,急需加强基础研究和保护管理.

The community of Ammopiptanthus.mongolicus is a kind of desert communities.The species,life form,ecotype,density,and coverage of vegetation characteristics of A.mongolicus community in Alasan Left Banner,Inner Mongolia was investigated and analyzed in this paper.The results showed the species numbers of Chenopodiaceae,Zygophyllaceae,Gramineae,Leguminosae and Compositae family was higher in the community.The plant ecotype of A.mongolicus community was mainly the xerophyte dominated by shrubs and semi-shrubs,and the life-form were mainly perennial herbs.Species richness and vegetation coverage in communities decreased with elevation rising.The composition and structure of A.mongolicus community were affected by topography,soil and water conditions.