The characteristics and stability of plant communities in the northern desert area of the middle reaches of the Heihe River Basin
The desert vegetation community in the Heihe River Basin is the first green defense line to prevent wind and sand from entering the inland of China,and is a natural barrier to protect the Hexi Corridor and even the Northwest China.In order to comprehensively grasp the vegetation types,distribution characteristics,and stability in the northern desert area of the middle reaches of the Heihe River Basin,this article takes the vegeta-tion community in the northern desert area of the middle reaches of the Heihe River Basin as the research object,and uses multi-year field investigation method to analyze the vegetation community characteristics and stability in the northern desert area of the middle reaches of the Heihe River Basin.The results show that:(1)The vegeta-tion community structure in the study area is relatively simple,with a total of 80 species of higher plants belong-ing to 23 families and 61 genera,of which angiosperms account for 97.5％of the total species.The six families of Tribulus,Poaceae,Chenopodiaceae,Leguminosae,Asteraceae,and Rosaceae account for 75.0％of the total species.(2)The layer structure of the vegetation community is simple,consisting of shrubs,semi shrubs,small shrubs,and herbaceous plants.The vegetation life form composition is dominated by herbaceous plants,account-ing for 67.5％of the total species.Perennial herbs account for 47.5％of the total species,while annual herbs and shrubs account for 20.0％and 32.5％of the total species,respectively.The number of perennial herbaceous plant species has a clear advantage.Shrubs are community building species and belong to the stable layer of the com-munity,while annual herbs belong to the unstable layer of the community.(3)The most stable community in the study area is the Nitraria tangutorum+Caroxylon passerinum community.In summary,the plant species in the northern desert area of the middle reaches of the Heihe River Basin are poor,the community coverage is low,and the stability is weak.It is recommended to strengthen the protection and restoration of desert vegetation,es-pecially the protection and restoration of stable communities,to maintain the stability and sustainability of the ecosystem.
plant communitystabilitynorthern desert areathe middle reaches of the Heihe River Basin
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