内蒙古荒漠区红砂(Reaumuria soongorica)种群格局  

Spatial Patterns of Reaumuria soongoricain the Desert Area of Inner Mongolia

作　　者：刘树敏[1] 杨九艳[1] 清华[1] 宋雪梅[1] 韩风林 

机构地区：[1]内蒙古大学生命科学学院,内蒙古呼和浩特010021

出　　处：《中国沙漠》2016年第5期1331-1339,共9页Journal of Desert Research

基　　金：内蒙古自然科学基金项目(2014MS0350);国家重点研究发展计划课题(2016YFC0501006);内蒙古自治区高等学校科学研究项目(NJ10002)

摘　　要：在内蒙古荒漠区依照红砂的自然分布,按湿润度梯度,从东到西分别在荒漠草原-草原化荒漠过渡区、草原化荒漠、草原化荒漠-典型荒漠过渡区及典型荒漠植被带上选取样地,对红砂(Reaumuria soongorica)种群进行实地调查,根据植株体积划分等级,运用点格局分析法,对红砂种群分布格局进行了研究。结果表明:从荒漠草原向草原化荒漠的过渡区到典型荒漠,随着干旱程度的加剧,红砂种群密度逐渐下降,从稳定增长型种群向成熟或衰退型种群变化,种群格局由聚集分布变为随机分布,聚集的尺度逐渐减少,在典型荒漠种群也出现了均匀分布。红砂种群级别间的空间关联性,具有很强的空间异质性和尺度异质性。随着干旱化和荒漠化程度加剧,红砂种群内部相互有利的生态关系在减弱,到典型荒漠区甚至有种群内部负向(相互排斥)的生态关系出现。荒漠区红砂群落组成简单,在典型荒漠成为纯一的红砂群落,具有特殊性和脆弱性,应重视保护与合理利用。According to the natural distribution of Reaumuria.soongorica in desert regions of Inner Mongolia,we selected four typical vegetation belt（transitional zone from desert steppe to steppificated desert,steppificated desert zone,transitional zone from steppificated desert to typical desert and typical desert zone）from east to west as the sampling plots.Based on field investigation of the R.soongorica population,according to different levels classified by plant volume,the spatial pattern of the R.soongoricapopulations was studied by using point pattern analysis.The results showed that：with the aggravating drought degree,the population density of R.soongorica decreased;the population model changed from growing to mature or senescent type;the population pattern changed from aggregated distribution to random distribution;the R.soongorica populations clumped in smaller scales;regular distribution occurred in typical desert zone.Spatial associations of different R.soongorica population classes had strong spatial heterogeneity and scale heterogeneity.With the aggravating drought and desertification degree,the internal ecology mutually beneficial relationship of the R.Soongorica population was weaken;even an unfavorable internal ecology relationship appeared in typical desert zone.In desert regions of Inner Mongolia,the community composition of R.soongorica was simple,especially in typical desert zone,the community composition of R.soongorica was simple composed by itself.The community of R.soongorica in desert regions of Inner Mongolia was special and fragile.

关 键 词：红砂(Reaumuria soongorica) 种群年龄结构 空间分布格局 空间关联性 

分 类 号：Q948.15[生物学—植物学]