基于 MaxEnt 生态位模型的 小花十万错在中国的潜在分布.

[Objective] The present paper aimed to investigate the impacts of climate variables, environmental factors and environmental quality indicators on the range of Asystasia gangetica ssp. micrantha, and to offer a foundation for efficient management strategies. [Method) The MaxEnt ecological niche model was used to predict the potential suitable areas of A. gangetica ssp. micrantha in China. [Result] The annual precipitation of 2000-3500 mm, the annual average temperature of 25-26 °C, and the annual temperature variation range of 6-14 °C were the most suitable for the growth of A. gangetica ssp. micrantha, and the lowest temperature of the coldest month was 20-30 °C, and the average temperature of the coldest season was about 27 C, when A. gangetica ssp. micrantha could maintain the maximum growth efficiency, but it could still survive when the precipitation of the driest month was only 40 mm. The above results indicated that A. gangetica ssp. micrantha had the characteristics of thermophilic, cold-avoiding and drought-resistant. In terms of geographical distribution, A. gangetica ssp. micrantha was currently only found in Hainan, Taiwan and Guangdong provinces, but according to the simulation analysis of the current climate by the MaxEnt model, A. gangetica ssp. micrantha has suitable areas in some regions of Yunnan, Guangxi, Guizhou, Fujian, Jiangxi, Sichuan and e- ven Tibet, indicating that these regions were at risk of being invaded by A. gangetica ssp. micrantha. Through the analysis of future climate, it can be concluded that the distribution range of A. gangetica ssp. micrantha in China was expanding, and the expanding areas were concentrated in Yunnan, Guangxi, Guangdong, Fujian, Hainan and other places. (Conclusion] The growth and distribution of A. gangetica ssp. micrantha is the most easily affected by factors, such as annual temperature variation range, annual precipitation, annual average temperature, al- titude and so on. At present, Guangdong, Guangxi, Fujian, Yunnan, Hainan, Taiwan and other provinces are facing the invasion of A. gangetica ssp. micrantha, among which Taiwan's problem is the most serious, followed by Guangdong and Hainan, and the rest of the provinces have not found any records of its invasion. However, from the climate analysis, there is still a possibility of being invaded by A. gangetica ssp. mi- crantha in Yunnan, Sichuan, Guangxi and other places where there are medium and high suitable areas. Therefore, regional and key preven- tion and control plans should be formulated according to the characteristics and suitability levels of the prevention areas, and chemical and bi- ological control measures should be promoted in the invaded areas to prevent A. gangetica ssp. micrantha from spreading to neighboring are- as, while in the uninvaded areas, prevention and control measures should be formulated with emphasis on strengthening quarantine and expan- ding detection to prevent A. gangetica ssp. micrantha from spreading across regions. [ABSTRACT FROM AUTHOR]