【摘要】 本文依据实地监测资料,分析了孔雀河下游断流河道的植被退化特征及植物类群与环境的关系,旨在为荒漠河岸生态系统保护与恢复提供参考。结果表明:胡杨作为孔雀河下游荒漠河岸林的建群种及优势种,顺沿河道呈现出死亡数增加的趋势;存留胡杨以成年木较多,存留格局为集聚型。K1断面物种多样性及丰富度平均值都较高,反映出群落相对的稳定性;K2断面多样性与丰富度都较低,且均匀度波动较大,反映出群落的不稳定性。CCA排序把植被分为深水位-适盐类群、深水位-耐盐类群与浅水位-喜盐类群,其中以胡杨为优势的深水位-适盐类群维持了较好的土壤养分,而以盐爪爪、盐穗木为优势的浅水位-喜盐类群,占据了地下水埋深浅、盐分含量高、养分极端贫瘠的生境。更多还原

【Abstract】 This Article analyzes the vegetation degradation of dried-up riverway in the lower reaches of Peacock River as well as the relation of plant group to environment on the basis of field monitoring data,in order to provide a reference for preservation and restoration of desert riparian ecosystem.The results showed that:as a constructive species and a dominant species of desert riparian forest in the lower reaches of Peacock River,Populus euphratica showed a rising trend of deaths along the riverway;the majorities of remaining Populus euphratica were mature trees of clustered type.High average species diversity and richness of K1 section reflected relative stability of community;low diversity and richness of K2 section as well as large evenness fluctuation reflected instability of community.Vegetation is divided into deep GD(groundwater depth)-halophyte group,deep GD-salt-tolerance group and low GD-euhalophyte group by CCA,in which deep GD-halophyte group with Populus euphratica being a dominant species preserves good soil nutrient,while low GD-euhalophyte group with Kalidium foliatum and Halostachys caspica being dominant species occupies low groundwater depth,high salt content and extreme nutrient depletion habitat.更多还原