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[1]LIN Hong,JIAO Juying,CHEN Tongde,et al.Species Composition and Diversity of Vegetation of Diluvial Fan in the Lhasa River Basin of Tibet[J].Research of Soil and Water Conservation,2021,28(05):67-75.

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Species Composition and Diversity of Vegetation of Diluvial Fan in the Lhasa River Basin of Tibet

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 05 Page number: 67-75 Column: Public date: 2021-08-20

Title:: Species Composition and Diversity of Vegetation of Diluvial Fan in the Lhasa River Basin of Tibet

Author(s):: LIN Hong^1,2,JIAO Juying^1,3,CHEN Tongde¹,ZHAO Chunjing^1,4; (1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Northwest A&F University,Yangling,Shaanxi712100,China;2.Natural Resources Department of Cuona County in Shannan City of Tibetan Autonomous Region,Shannan,Tibet856000,China;3.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi712100,China;4.Yellow River Institute of Hydraulic Research,Zhenzhou450003,China)

Keywords:: land use; species composition; dominant specie; species diversity; vegetation protection

CLC:: Q948.1

DOI:: -

Abstract:: As an important geomorphic unit in the Lhasa River Basin,the alluvial fan has unique geographical location and climatic conditions. Although the vegetation resources are relatively rich,the man-made damage is serious. The investigation and study of the vegetation in this geomorphology can provide basic data and reference for the development,utilization and protection of the plant resources,the restoration and reconstruction of the vegetation of the alluvial fans. The 12 typical alluvial fans in the middle and lower reaches of Lhasa River Basin were selected as investigation sites through Google Earth. According to their main land use types,the fans were divided into three categories: A,B and C. From July 15 to August 4,2019,the plant species,abundance,height and coverage on the alluvial fans were investigated,and the quantitative characteristics of vegetation such as species composition and species diversity were analyzed. The results were as follows.(1)There were 82 species of plants belonging to 33 families and 75 genera in 12 alluvial fan plots,among which the genera and species of Compositae,Gramineae,Leguminosae and Rosaceae are rich,accounting for 16.00%,14.67%,9.33% and 6.67% of the total genera,and 17.07%,13.41%,8.54% and 7.32% of the total species respectively.(2)The life-form distribution of plants on three types of alluvial fans A,B and C basically show the order: by hemicryptophytas>annual buds> phanerophytes>chamaephytas>geophytes,which is consistent with the overall distribution trend of plants on 12 alluvial fans.(3)By calculating the important value of community species,18 herbaceous communities,4 shrub communities,4 arbor communities and 3 crop communities are determined,among which the communities of Eleusine indica,Caragana microphylla,Salix babylonica and Hordeum vulgare most commonly distribute in alluvial fans.(4)By analyzing the species diversity characteristics of different types of alluvial fans,it can be seen that A type of alluvial fans were more diverse in species distribution than the other two types,while B type of alluvial fans were the most prominent in species uniformity and complexity and stability,and C type of alluvial fans were the most prominent in ecological superiority. Defining the species composition,dominant species and diversity characteristics of vegetation of different types of alluvial fans is conducive to the targeted protection and restoration of vegetation of different types of alluvial fans.

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Last Update: 2021-08-20