祁连山北麓荒漠草原红砂灌丛群落特征分析OA

[Objective]To investigate the community characteristics of Reaumuria Songarica shrubs in the des-ert grassland at the northern foot of the Qilian Mountains,to provide reference for the protection and restoration of re-gional desert grassland.[Method]The desert grassland at the northern foot of the Qilian Mountains was selected to analyze the plant community structure,species diversity,and biomass,as well as their intrinsic relationships.[Result]There were 17 species of plants belonging to 11 families and 15 genera in the desert grassland communities of the northern Qilian Mountains,among which,Asteraceae accounted for 29.41%of the total number of species,while most other families and genera were represented by a single species.There were 8 shrub species and 9 herbaceous species.The community structure was simple,conforming to the characteristics of arid desert vegetation.The species in this area are relatively homogeneous with small aboveground biomass,and Reaumuria songarica occupies an im-portant position in the community with a relatively large percentage of important value.The proportion of community life-forms was in the following order:Cryptophytes>Chamaephytes>Hemicryptophytes>Phaenerophytes>Therophytes.The community plant diversity index was low,and the size of species diversity in each level of the verti-cal structure was herb layer>shrub layer.There was a positive correlation between community plant diversity and its aboveground biomass.[Conclusion]The community structure of the Reaumuria songarica desert grasslands in the northern Qilian Mountains is simple and possesses low diversity,so it is necessary to strengthen the protection and restoration of vegetation and habitats in order to maintain the stability and continuity of the desert grassland eco-system.