The Species Composition and Distributional Characteristics of Alien Invasive Plants in the Lower Reaches of Lhasa River
This study aims to identify alien invasive plants species and their distribution characteristics in the lower reaches of Lhasa River to provide theoretical support for biodiversity conservation and prevention of inva-sive plants in the region.Through field surveys combining with literature review and specimen data analysis,a to-tal of 59 alien invasive plant species were identified belonging to 18 families and 48 genera,in the study area.Asteraceae(21 species),Fabaceae(8 species),and Poaceae(6 species)were the dominant families and Amaran-thus L.,Erigeron L.,and Sonchus L.were the dominant genera.The result of floristical analysis revealed that the families of alien invasive plants were dominated by wide world distributed type of family and the majority of gen-era show temperate distribution type,particularly northern temperate distribution type.The risk levels of these in-vasive species were categorized from 1 to level 5,with 7,15,3,24 and 10 species,respectively.Species of Galin-soga parviflora Cav.,Sonchus oleraceus L.and Senecio vulgaris L.have the highest occurrence frequency.The main introducing pathway of invasive plants was unintentionally and originated from the Americas primarily.The result of piecewise linear regression analysis showed that the number of alien invasive plant species decreased significantly with increasing altitude.The ecological environment in the lower reaches of Lhasa River face a po-tential threat from alien invasive plants with the ongoing process of globalization and the rise in human activities.It is recommended that relevant authorities,research institutions,and universities should prioritize this issue to enhance regulation,public awareness and effective control measures.
lower reaches of the Lhasa Riveralien invasive plantspecies compositiondistribution characteris-tics
万方数据
维普
