青藏高原东北部人为干扰下的高寒草甸传粉网络研究

	青藏高原东北部人为干扰下的高寒草甸传粉网络研究; Plant-pollinator interaction networks in the changing alpine meadows on the northeastern Qinghai-Tibet Plateau
	王林林
导师	杨永平
摘要	Grasslands on the Qinghai-Tibetan Plateau provide key ecosystem functions and services. With the intensification of climate change and human activities, grazing, beekeeping, nitrogen deposition, and biological invasion are significantly changing highland biodiversity and ecosystem functions. However, the effects of human activities and climate changes on pollination networks of alpine ecosystems and reproductive performance of wild alpine plants remain largely unknown. This dissertation carried out to better understand the effects of human activities (beekeeping) and climate change (simulated nutrition addition) on structure and function of pollination networks of alpine meadows on the Qinghai-Tibet Plateau, with three main topics : 1) The effects of two massively introduced managed species (Brassica rapa var. oleifera and Apis mellifera) on pollination network structure and function; 2) The effects of nitrogen addition and phosphorus addition on pollination networks; 3) The structure of pollination networks at pollinator individual-level. The key findings are summarized as follows: 1. The effects of honeybee spillover on pollination network structure and reproduction success of wild plants. The introduction of honeybees (A. mellifera) to pollinate rape (B. rapa var. oleifera) is an important agricultural activity on the Qinghai-Tibet Plateau in the past 20 years. After the introduction of honeybees, honeybees maybe spill over adjacent natural habitats. Therefore, by comparing two native communities with high and low visitation rates of honeybees on the Qinghai-Tibet Plateau, we examined the effects of spillover during the rape blooming on pollination network structure and reproductive performance of eleven wild plant species. The results showed that there was the consistent spillover of managed honeybees from a mass-flowering rape into adjacent natural habitats during crop blooming. Short-term beekeeping during the blooming of mass flowering crops reduced both diversity and abundance of wild pollinators and stability of pollination network in community with high honeybees’ visitation rate. Moreover, reproductive success of indigenous plants was altered species-specifically, detailed as increasing seed production of fly-pollinated plants, decreasing seed production of bumblebee-pollinated plants, and no change of seed production of bumblebee- and fly-pollinated plants. Those results revealed that honeybees disrupted pollination network structure and pollination services by reducing wild pollinator diversity, highlighting the different impacts of honeybee spillover on biodiversity and ecosystem function on alpine communities. 2. The effects of nitrogen and phosphorus addition on pollination networks. Using nitrogen and phosphorus addition treatments on an alpine meadow of the Qinghai-Tibet Plateau, we examined the effects of nutrient additions on the structure of pollination networks. The results showed that nitrogen and phosphorus addition treatm
	2020-05
文献类型	学位论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74186
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	王林林. 青藏高原东北部人为干扰下的高寒草甸传粉网络研究, Plant-pollinator interaction networks in the changing alpine meadows on the northeastern Qinghai-Tibet Plateau[D],2020.

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