1. 外来入侵植物肿柄菊在云南的扩散风险研究.
- Author
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陈 剑, 王四海, 朱 枫, and 袁春明
- Subjects
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INTRODUCED plants , *TITHONIA diversifolia , *INVASIVE plants , *ALTITUDES , *TROPICAL plants , *BIOLOGICAL invasions - Abstract
Predicting the potential range of invasive alien plants and their adaptabilities to different environments could give early warning and prevention measures. The diverse bioclimatic types in Yunnan province would provide rich potential habitats for alien invasive plants. Tithonia diversifolia, an alien plant invading in tropical and sub-tropical regions of Yunnan, has quickly dispersed in recent years. In order to evaluate the risk of its invasion in different geographical environments, we investigated the invasion situation of T. diversifolia in Yunnan Province, and collected the distribution samples in the world. Using this species' distribution coordinates and 12 main environmental variables, we analyzed the suitability of T. diversifolia to different environments and the dominating environmental factors by MaxEnt model. The results were as follows: Yunnan had not high-suitability area in the worldwide pattern of T. diversifolia's distribution, meanwhile sub-, medium-, low-, un-suitability area accounted for 3.58%, 32.90%, 42.80% and 20.72% of the provincial area, respectively; Medium-suitability area was the main risk region, which widely interspersed in the south of 26° N in Yunnan; Field investigation showed T. diversifolia mainly distributed at the altitude of 1 000-1 500 m and its upper altitudinal limit was 2 200 m, while the model predicted that the altitude region below 2 000 m was suitable, especially between 500-2 000 m; The most important environmental factors affecting distribution of T. diversifolia were annual precipitation, human footprint, annual average temperature and altitude. In conclusion, although T. diversifolia has reached sporadically its suitable geographical limiting boundary at present, the invaded area is far less than the potential suitable area. It is necessary to keep monitoring T. diversifolia's dispersal dynamic in the future, so that hazard caused by T. diversifolia could be controlled in time. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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