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	Spatial and temporal patterns of CO(2) and CH(4) fluxes in China's croplands in response to multifactor environmental changes
	Ren W. ; Tian H. Q. ; Xu X. F. ; Liu M. L. ; Lu C. Q. ; Chen G. S. ; Melillo J. ; Reilly J. ; Liu J. Y.
	2011
关键词	soil organic-carbon land-cover change methane emissions stomatal conductance climate variability plant respiration ozone pollution united-states gas emissions rice paddies
英文摘要	The spatial and temporal patterns of CO(2) and CH(4) fluxes in China's croplands were investigated and attributed to multifactor environmental changes using the agricultural module of the Dynamic Land Ecosystem Model (DLEM), a highly integrated process-based ecosystem model. During 1980-2005 modelled results indicated that China's croplands acted as a carbon sink with an average carbon sequestration rate of 33.4 TgC yr-1 (1 Tg = 1012 g). Both the highest net CO(2) uptake rate and the largest CH(4) emission rate were found in southeast region of China's croplands. Of primary influences were land-cover and land-use change, atmospheric CO(2) and nitrogen deposition, which accounted for 76%, 42% and 17% of the total carbon sequestration in China's croplands during the study period, respectively. The total carbon losses due to elevated ozone and climate variability/change were equivalent to 27% and 9% of the total carbon sequestration, respectively. Our further analysis indicated that nitrogen fertilizer application accounted for 60% of total national carbon uptake in cropland, whereas changes in paddy field areas mainly determined the variability of CH(4) emissions. Our results suggest that improving air quality by means such as reducing ozone concentration and optimizing agronomic practices can enhance carbon sequestration capacity of China's croplands.
出处	Tellus Series B-Chemical and Physical Meteorology
卷	63
期	2
页	222-240
收录类别	SCI
语种	英语
ISSN号	0280-6509
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23142]
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	Ren W.,Tian H. Q.,Xu X. F.,et al. Spatial and temporal patterns of CO(2) and CH(4) fluxes in China's croplands in response to multifactor environmental changes. 2011.

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