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	The impacts of climate change and human activities on biogeochemical cycles on the Qinghai-Tibetan Plateau
	Zhang Y.; Zhang Y.
	2013
关键词	carbon budget ice retreat intact ecosystems land use change permafrost ecosystem co2 exchange delayed spring phenology alpine meadow ecosystem permafrost degradation methane emissions terrestrial ecosystems grazing intensity plant-communities thermokarst lakes soil respiration
英文摘要	With a pace of about twice the observed rate of global warming, the temperature on the Qinghai-Tibetan Plateau (Earth's third pole') has increased by 0.2 degrees C per decade over the past 50years, which results in significant permafrost thawing and glacier retreat. Our review suggested that warming enhanced net primary production and soil respiration, decreased methane (CH4) emissions from wetlands and increased CH4 consumption of meadows, but might increase CH4 emissions from lakes. Warming-induced permafrost thawing and glaciers melting would also result in substantial emission of old carbon dioxide (CO2) and CH4. Nitrous oxide (N2O) emission was not stimulated by warming itself, but might be slightly enhanced by wetting. However, there are many uncertainties in such biogeochemical cycles under climate change. Human activities (e.g. grazing, land cover changes) further modified the biogeochemical cycles and amplified such uncertainties on the plateau. If the projected warming and wetting continues, the future biogeochemical cycles will be more complicated. So facing research in this field is an ongoing challenge of integrating field observations with process-based ecosystem models to predict the impacts of future climate change and human activities at various temporal and spatial scales. To reduce the uncertainties and to improve the precision of the predictions of the impacts of climate change and human activities on biogeochemical cycles, efforts should focus on conducting more field observation studies, integrating data within improved models, and developing new knowledge about coupling among carbon, nitrogen, and phosphorus biogeochemical cycles as well as about the role of microbes in these cycles.
出处	Global Change Biology
卷	19
期	10
页	2940-2955
收录类别	SCI
语种	英语
ISSN号	1354-1013
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30633]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Zhang Y.,Zhang Y.. The impacts of climate change and human activities on biogeochemical cycles on the Qinghai-Tibetan Plateau. 2013.

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