中国红豆杉属物种的生态位分析与保护策略

	中国红豆杉属物种的生态位分析与保护策略; Ecological niche analysis and conservation strategies of Taxus species in China
	钟大吕
导师	高连明
摘要	Global climate change is profoundly affecting the distribution patterns of biological population. Species responds to climate change through ecological adaptation and regional migration, and even face the risk of extinction for species with low adaptive ability. Species distribution areas usually migrate to high altitude or high latitude, but the migration patterns of different species in response to climate change are different. Taxus species are all national first-class wild protected plants in China. It is difficult to design effective conservation strategies due the confusing taxonomy and blurred geographical distribution of yew species, which results in the severe situation of protection. In this study, all 11 species occurred in China based on the latest species taxonomy of the genus were included. Based on the species distribution records and climate variables data, niche PCA (principal component analysis) model and species suitable area model were simulated, aimed to analyze the niche differences among species, and the migration dynamics of suitable area of each species in four historical periods. Some suggestions on species protection were proposed. The main results and conclusions are as follows: Based on the current species distribution records and environmental ecological variables, niche PCA models were simulated to analyze the niche differences among 11 Taxus species. The results demonstrated significant niche divergence among 16 species pairs, and no significant differences among the other 39 species pairs, but no species pair with significant niche conservation. Taxus calcicola, T. phytonii, and Huangshan type have the most significant niche differentiation from other species. Emei type and T. florinii, two hybrid species which share the same parent species, have similar characteristics, and their niches are narrow and more similar to the maternal parent species, respectively.They are more adaptable to the alpine environment than the maternal parent species. There were significant niche differences between the two ecotypes of T. mairei, and the niche of mr-SW is much looser. Based on the species distribution records and environmental ecological variables of each period, the suitable areas of 10 Taxus species at the last interglacial period (LIG), the last glacial maximum (LGM), current and future (2070) were simulated. The results showed that the area and distribution location of the suitable areas changed in different historical periods. From the past to the present, patterns of the suitable areas of different species had obvious differences, such as the proportion of area shift, the difference of average altitude shift and the difference of migration in latitude or longitude. The geographical distribution ranges of T. chinensis, T. florinii, T. wallichiana and Emei type occurred in Hengduan Mountains and mountainous area around Sichuan Basin, are quite far apart nowadays, but were much closer in LIG. The migration directions of
	2021-05
文献类型	学位论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74636
专题	昆明植物所硕博研究生毕业学位论文
推荐引用方式 GB/T 7714	钟大吕. 中国红豆杉属物种的生态位分析与保护策略, Ecological niche analysis and conservation strategies of Taxus species in China[D],2021.

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