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	Net exchanges of CO(2), CH(4), and N(2)O between China's terrestrial ecosystems and the atmosphere and their contributions to global climate warming
	Tian H. Q. ; Xu X. F. ; Lu C. Q. ; Liu M. L. ; Ren W. ; Chen G. S. ; Melillo J. ; Liu J. Y.
	2011
关键词	nitrous-oxide emissions methane emission temporal patterns carbon-dioxide mainland china natural wetlands north-america crop residue rice paddies land-use
英文摘要	China's terrestrial ecosystems have been recognized as an atmospheric CO(2) sink; however, it is uncertain whether this sink can alleviate global warming given the fluxes of CH(4) and N(2)O. In this study, we used a process-based ecosystem model driven by multiple environmental factors to examine the net warming potential resulting from net exchanges of CO(2), CH(4), and N(2)O between China's terrestrial ecosystems and the atmosphere during 1961-2005. In the past 45 years, China's terrestrial ecosystems were found to sequestrate CO(2) at a rate of 179.3 Tg C yr(-1) with a 95% confidence range of (62.0 Tg C yr(-1), 264.9 Tg C yr(-1)) while emitting CH(4) and N(2)O at rates of 8.3 Tg C yr(-1) with a 95% confidence range of (3.3 Tg C yr(-1), 12.4 Tg C yr(-1)) and 0.6 Tg N yr(-1) with a 95% confidence range of (0.2 Tg N yr(-1), 1.1 Tg N yr(-1)), respectively. When translated into global warming potential, it is highly possible that China's terrestrial ecosystems mitigated global climate warming at a rate of 96.9 Tg CO(2)eq yr(-1) (1 Tg = 10(12) g), substantially varying from a source of 766.8 Tg CO(2)eq yr(-1) in 1997 to a sink of 705.2 Tg CO(2)eq yr(-1) in 2002. The southeast and northeast of China slightly contributed to global climate warming; while the northwest, north, and southwest of China imposed cooling effects on the climate system. Paddy land, followed by natural wetland and dry cropland, was the largest contributor to national warming potential; forest, followed by woodland and grassland, played the most significant role in alleviating climate warming. Our simulated results indicate that CH(4) and N(2)O emissions offset approximately 84.8% of terrestrial CO(2) sink in China during 1961-2005. This study suggests that the relieving effects of China's terrestrial ecosystems on climate warming through sequestering CO(2) might be gradually offset by increasing N(2)O emission, in combination with CH(4) emission.
出处	Journal of Geophysical Research-Biogeosciences
卷	116
收录类别	SCI
语种	英语
ISSN号	0148-0227
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22976]
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	Tian H. Q.,Xu X. F.,Lu C. Q.,et al. Net exchanges of CO(2), CH(4), and N(2)O between China's terrestrial ecosystems and the atmosphere and their contributions to global climate warming. 2011.

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