Re-evaluation of organic carbon pool from land surface down to bedrock on China's Loess Plateau

doi:10.1016/j.agee.2020.106842

	Re-evaluation of organic carbon pool from land surface down to bedrock on China's Loess Plateau
	Jia, Xiaoxu 2,3; Wu, Haiming 4; Shao, Ming'an 2,3,4; Huang, Laiming 2; Wei, Xiaorong 3,4; Wang, Yunqiang 1; Zhu, Yuanjun 3,4
刊名	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
	2020-05-01
卷号	293 页码:8
关键词	Carbon pool Carbon sequestration Vertical distribution Deep loess deposit Earth's critical zone
ISSN号	0167-8809
DOI	10.1016/j.agee.2020.106842
通讯作者	Zhu, Yuanjun(zhuyuanjun@foxmail.com)
英文摘要	Large reservoirs of organic carbon (OC) store in deep soils ( > 1 m below land surface) are not usually included in regional and global terrestrial C inventories. Chinaos Loess Plateau (CLP), which has the worldos deepest loess deposit and has experienced long-term, intensive agricultural and revegetation activities, could contain large stores of OC. In this study, the distribution of OC concentration and stock across the entire loess profile from the ground surface down to the bedrock (56-205 m) was assessed at five sites (Yangling, YL; Changwu, CW; Fuxian, FX; Anosai, AS; and Shenmu, SM) under three land use types (farmland, grassland and shrubland). There was pronounced decrease in mean OC concentration with increasing depth along loess profiles at all the investigated sites. OC concentration in the topmost 20 m of the loess was much higher and fluctuated more significantly than that in the deeper layers at YL, CW, FX and AS, where mean annual precipitation was > 550 mm. In contrast, OC concentration was low and stable at SM with mean annual precipitation < 450 mm. The restoration of vegetation with deep roots following the abandonment of farmlands resulted in deep OC accumulation at YL and AS, whereas natural grassland recovery did not result in the accumulation of OC at SM. Our results suggested that land use change could alter OC distribution in deep soils, of which degree depended on climatic condition and vegetation type. The estimated OC storage varied significantly across the sites (859-5044 Mg ha(-1)), which mainly depended on the thickness of loess deposit. OC store on the CLP and other areas around the world with deep soils or sediments could be underestimated and need re-consideration in future C budget studies. This is the first estimate of regional OC stock across loess profile, spanning from the land surface down to the bedrock. The findings could have significant implications for biogeochemical cycling of C in surface and deep soil layers down to the bedrock.
资助项目	National Key Project for Research and Development[2016YFC0501605] ; National Natural Science Foundation of China[41571130081] ; National Natural Science Foundation of China[51508466] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2017076] ; Open Research Fund of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau[A314021402-1806]
WOS关键词	DEEP SOIL CARBON ; VERTICAL-DISTRIBUTION ; ACCUMULATION ; DYNAMICS ; NITROGEN ; CLIMATE ; MATTER ; STOCKS ; AFFORESTATION ; MANAGEMENT
WOS研究方向	Agriculture ; Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000527589100009
资助机构	National Key Project for Research and Development ; National Natural Science Foundation of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Open Research Fund of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/14733]
专题	地球环境研究所_生态环境研究室
通讯作者	Zhu, Yuanjun
作者单位	1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 3.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 4.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Jia, Xiaoxu,Wu, Haiming,Shao, Ming'an,et al. Re-evaluation of organic carbon pool from land surface down to bedrock on China's Loess Plateau[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2020,293:8.
APA	Jia, Xiaoxu.,Wu, Haiming.,Shao, Ming'an.,Huang, Laiming.,Wei, Xiaorong.,...&Zhu, Yuanjun.(2020).Re-evaluation of organic carbon pool from land surface down to bedrock on China's Loess Plateau.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,293,8.
MLA	Jia, Xiaoxu,et al."Re-evaluation of organic carbon pool from land surface down to bedrock on China's Loess Plateau".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 293(2020):8.