Research Progress on the impact of climate change on plant invasiveness

At present, biological invasion has become a serious environmental problem and an important part of global change The combination of invasion ecology and global environmental change has become one of the hot issues in ecological research The biological invasion ecology group of Xishuangbanna Tropical Botanical Garden of Chinese Academy of Sciences studied the response difference of three kinds of plants to the doubling of carbon dioxide concentration, and analyzed the source and invasion of the biological invasion of Eupatorium adenophorum by using the population of origin (Mexico), invasion (China) and local relative species (baitoupo) of Eupatorium adenophorum as materials, using the artificial climate chamber of Ailaoshan ecological station The evolution of sex with environment The results show that, for most of the growth characters, the population of Eupatorium adenophorum in the invasion area is superior to the population of origin, and Eupatorium adenophorum in the population of origin is superior to the local relative species, which shows that Eupatorium adenophorum has both inherent competitive advantage and rapid progress in the invasion area, thus becoming a "super" invader At the same time, the content of cyanogen glycosides, a kind of important nitriding control substance, was determined It was found that the content of cyanogen glycosides in the invasive population was significantly lower than that in the original population, indicating that Eupatorium adenophorum did reduce the nitrogen input of chemical defense in the process of invasion This further validates the "evolutionary hypothesis of nitrogen distribution" proposed by Feng Yulong to explain the mechanism of plant invasion In addition, the study found that the increase of carbon dioxide concentration can promote the growth of three kinds of plants, and the effect is similar, so the increase of carbon dioxide concentration alone may not increase the biological invasion of Eupatorium adenophorum However, the ecological effect of the increase of carbon dioxide concentration is closely coupled with other environmental factors, such as nitrogen level, so the follow-up research is in progress At present, the research results of this part are published in biological invasions (2011, 13:2703-2714).