青藏高原植物功能性状和物种丰富度梯度格局研究

	青藏高原植物功能性状和物种丰富度梯度格局研究; Distribution patterns of functional traits and species richness of plants in Qinghai-Tibet Plateau region
	孙露
导师	孙航
摘要	Understanding how plant functional traits and species richness distribute across different spatial scales and their potential influences has attracted numerous attentions from researchers. With complex habitat environment and harbors a great number of species, Qinghai-Tibet Plateau region (one of the world's biodiversity hotspots) provides an ideal nature location for studying the distribution patterns of plant functional traits and species richness in a regional scale. In this study, we explored the distribution patterns and uncovered underlying impacts of three distinct aspects of biodiversity in Qinghai-Tibet Plateau region across broader scale, that is geographical variation of flower orientation, elevational gradient of clonal reproductive traits and elevational gradient of species richness of seed plants in the Mt. Namjagbarwa region. The detail results are as follows: (1) Spatial pattern of flower orientation in angiosperm species and its potental influences Based on the geographical distribution and flower character information (flower orientation and flower symmetry) of 8146 angiosperm species and environmental factors, we explored the geographical variation in proportion of species with downfacing flower and uncovered its potental influences in Qinghai-Tibet Plateau region. We found that the proportion of species with down-facing flower reach 31.8% for overall species. However, the proportion of species with down-facing flower in actinomorphic group was significantly lower than that in zygomorphic group, which should be associated with pollinator behavior. Across spatial scale, the proportion of species with down-facing flower exhibited evident heterogeneity, ranged from 0 to 48.4% of species. Prevalence of down-facing flower was generally greatest in the Hengduan Mountains and Southeastern Himalayas region, while the lower readings occurred in the northern and western parts of Qinghai-Tibet Plateau region. In overall species and actinomorphic group, the proportion of species with down-facing flower were positively correlated with mean annual temperature, annual precipitation and annual mean UV-B, indicating down-facing flower are more likely to be found in wet, hot or high radiation sites. In zygomorphic group, the proportion of species with down-facing flower was also positively with mean annual temperature and annual precipitation, but insignificantly correlated with annual mean UV-B which should be the result of protection from flower structure equipment. (2) Elevational patterns of clonal reproduction traits in angiosperm species and its underlying impacts Based on accessible databases including regional floras and extensive sampling records, we constructed regional species checklists of angiosperm species and their elevational range for the northern Gaoligong Mountains and the Mt. Namjagbarwa region. Each species was categorized as species with clonal reproduction trait or without clonal reproduction trait according their morpholo
	2020-11
文献类型	学位论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74177
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	孙露. 青藏高原植物功能性状和物种丰富度梯度格局研究, Distribution patterns of functional traits and species richness of plants in Qinghai-Tibet Plateau region[D],2020.

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孙露-博士毕业论文写作-20201201（5138KB）	学位论文		限制开放	CC BY-NC-SA	请求全文