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	Ecosystem Carbon Fluxes in Response to Warming and Clipping in a Tallgrass Prairie
	Niu S. L. ; Sherry R. A. ; Zhou X. H. ; Luo Y. Q.
	2013
关键词	climate warming biofuel harvest C-3 C-4 carbon fluxes carbon sequestration optimum temperature plant functional types feedback global vegetation models land-use change terrestrial ecosystems cycle feedback biomass accumulation semiarid grassland soil respiration temperate steppe climate-change gas-exchange
英文摘要	Global warming and land-use change could have profound impacts on ecosystem carbon (C) fluxes, with consequent changes in C sequestration and its feedback to climate change. However, it is not well understood how net ecosystem C exchange (NEE) and its components respond to warming and mowing in tallgrass prairie. We conducted two warming experiments, one long term with a 1.7A degrees C increase in a C-4-dominated grassland (Experiment 1), and one short term with a 2.8A degrees C increase in a C-3-dominated grassland (Experiment 2), to investigate main and interactive effects of warming and clipping on ecosystem C fluxes in the Great Plains of North America during 2009-2011. An infrared radiator was used to simulate climate warming and clipping once a year mimicked mowing in both experiments. The results showed that warming significantly increased ecosystem respiration (ER), slightly increased GPP, with the net outcome (NEE) being little changed in Experiment 1. In contrast, warming significantly suppressed GPP and ER in both years, with the net outcome being enhanced in NEE (more C sequestration) in 2009-2010 in Experiment 2. The C-4-dominated grassland showed a much higher optimum temperature for C fluxes than the C-3-dominated grassland, which may partly contribute to the different warming effects in the two experiments. Clipping significantly enhanced GPP, ER, and NEE in both experiments but did not significantly interact with warming in impacting C fluxes in either experiment. The warming-induced changes in ecosystem C fluxes correlated significantly with C-4 biomass proportion but not with warming-induced changes in either soil temperature or soil moisture across the plots in the experiments. Our results demonstrate that carbon fluxes in the tallgrass prairie are highly sensitive to climate warming and clipping, and C-3/C-4 plant functional types may be important factor in determining ecosystem response to climate change.
出处	Ecosystems
卷	16
期	6
页	948-961
收录类别	SCI
语种	英语
ISSN号	1432-9840
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30330]
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	Niu S. L.,Sherry R. A.,Zhou X. H.,et al. Ecosystem Carbon Fluxes in Response to Warming and Clipping in a Tallgrass Prairie. 2013.

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