Distribution,Diffusion Trend and Risk Analysis of Invasive Plant Ageratum conyzoides in Yunnan Province
In order to clarify the distribution pattern,diffusion trend and invasion hazard risk of Ageratum cony-zoides in Yunnan province,the occurrence sites of A.conyzoides were obtained through the whole-province investiga-tion and sample field investigation in Yunnan province,and the distribution pattern and diffusion trend of A.conyzoides in Yunnan province were predicted based on the MaxEnt ecological model.According to the index sys-tem of risk analysis of forestry hazards and pests of State Forestry Administration,the risk of invasion of A.conyzoides in Yunnan Province was analyzed.The results showed that:(1)A.conyzoides was widely distributed in 72 counties(districts)in 14 prefectures(cities)of Yunnan Province,mainly in Dehong,Lincang,Xishuangbanna,Pu'er,Hong-he and other border areas,and in the dry and hot valley areas of Nujiang and Jinsha rivers;(2)The MaxEnt predic-tion results showed that under the condition of climate change,A.conyzoides would spread to Kunming,Chuxiong,Yuxi,Honghe and other high-altitude areas in central Yunnan,and four climate factors,including precipitation in the wettest season,seasonal variation of precipitation,annual average temperature,and annual precipitation,were the main limiting factors affecting the distribution of A.conyzoides in the future.(3)The results of risk analysis showed that A.conyzoides was a highly dangerous invasive plant in Yunnan.
万方数据
维普
