干旱区生态环境知识资源中心(Arid): Spatiotemporal evolution of carbon sequestration of limestone weathering in China

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	Spatiotemporal evolution of carbon sequestration of limestone weathering in China
	Li Huiwen; Wang Shijie; Bai Xiaoyong; Cao Yue; Wu Luhua
来源期刊	Science China. Earth Sciences
ISSN	1674-7313
出版年	2019
卷号	62 期号:6 页码:974-991
英文摘要	Carbonate carbon sequestration (CS) can aid in solving the problem of terrestrial residual carbon sinks and imbalances in the global carbon budget. Thus, complete understanding of the magnitude, spatiotemporal distribution, and evolution of this sequestration is highly desirable. On the basis of random forest regression and maximal potential dissolution model for carbonate, we estimated the CS of typical carbonate weathering in China from 2000 to 2014, that is, the sequestration of limestone weathering, using long-term ecologic, meteorological, hydrological raster data, and monitored data from 44 watersheds in China and surrounding regions. We extended our analyses by systematically exploring the spatiotemporal pattern and evolution trend of the flux and total sequestration. High levels of ionic activity coefficients of Ca~(2+) and HCO3 in limestone regions were observed to be mainly distributed in Northern and Northwestern China with a clear gradient from northwest to southeast. With a contrary spatial pattern, the annual average CS flux (CSF) of limestone weathering in China was estimated to be 4.28 t C km~(-2) yr~(-1), with high values mainly in the karst zones in Southeastern China. The mean CSF in different latitudes showed that Southern China (south of 28.14°N) was the region with the largest interannual fluctuation of flux and CSF increases as latitude decreases. The mean CSF in subtropical and tropical (TR) regions was the maximum of all major climate types, and for the frigid (F), mid-temperate (MTE), warm temperate (WTE), and temperate (TE) major climates; the CSF in the desert (D) subdivided climate was the minimum of these climates. By contrast, the values in grassland (G) and broad-leaved forest subdivided climate were the maximum. The pixel-based trend analysis indicated that the CSF of limestone weathering in China was slightly increasing in the period 2000-2014 with a rate of 0.036 t C km~(-2) yr~(-1). Furthermore, the annual total CS was estimated to be 7.07 Tg carbon per year (Tg C yr~(-1)) with high levels in 2002, 2008, and 2010, and the minimum appeared in 2011 with a slightly increasing trend of the total CS being observed with a rate of 0.06 Tg C yr~(-1). Tibet Autonomous Region was the administrative division with the largest total CS of limestone weathering (1.20 Tg C yr~(-1)) in China, and karst zones in Southeastern China had the largest total CS (4.95 Tg C yr~(-1)) which accounts for 70.01% of that in the three divided karst regions. On the basis of the diversity of rock chemical weathering carbon cycle mechanisms of different carbonate rock types, we estimated that the total CS of carbonate weathering in China may reach 11.37 Tg C yr~(-1) (the sink was approximately 5.02 t C km~(-2) yr~(-1)), which amounts to 16.20% of the total biomass CS in China, furthermore, the CSF of carbonate weathering in China can reach 6.54 t C km~(-2) yr~(-1) if excluding the interference of the negative runoff. This finding indicates that CS of carbonate weathering is an indispensable part of China's terrestrial carbon sink system. The research pattern of this study was important for further improving the accuracy of the estimation for the global carbonate weathering carbon sink.
英文关键词	Limestone Chemical weathering carbon sink Spatiotemporal evolution Dissolution Random forest
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Mathematics
CSCD记录号	CSCD:6516804
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336126
作者单位	Li Huiwen, Institute of Geochemistry, Chinese Academy of Sciences;;Puding Comprehensive Karst Research and Experimental Station, Institute of Geochemistry, Chinese Academy of Sciences and Science and Technology Department of Guizhou Province;;University of Chinese Academy of Sciences, State Key Laboratory of Environmental Geochemistry;;;;, Guiyang;;Anshun;;, ;;;;Beijing 550081;;562100;;100049.; Cao Yue, Institute of Geochemistry, Chinese Academy of Sciences;;Puding Comprehensive Karst Research and Experimental Station, Institute of Geochemistry, Chinese Academy of Sciences and Science and Technology Department of Guizhou Province;;University of Chinese Academy of Sciences, State Key Laboratory of Environmental Geochemistry;;;;, Guiyang;;Anshun;;, ;;;;Beijing 550081;;562100;;100049.; Wang Shijie, Institute of Geochemistry, Chinese Academy of Sciences;;Puding Comprehensive Karst Research and Experimental Station, Institute of Geochemistry, Chinese Academy of Sciences and Science and Technology Department of...
推荐引用方式 GB/T 7714	Li Huiwen,Wang Shijie,Bai Xiaoyong,et al. Spatiotemporal evolution of carbon sequestration of limestone weathering in China[J],2019,62(6):974-991.
APA	Li Huiwen,Wang Shijie,Bai Xiaoyong,Cao Yue,&Wu Luhua.(2019).Spatiotemporal evolution of carbon sequestration of limestone weathering in China.Science China. Earth Sciences,62(6),974-991.
MLA	Li Huiwen,et al."Spatiotemporal evolution of carbon sequestration of limestone weathering in China".Science China. Earth Sciences 62.6(2019):974-991.