Simulated response of soil organic carbon density to climate change in the Northern Tibet permafrost region

doi:10.1016/j.geoderma.2021.115455

	Simulated response of soil organic carbon density to climate change in the Northern Tibet permafrost region
	Zhao, Dongsheng 2; Zhu, Yu 1,2; Wu, Shaohong 1,2; Lu, Qing 3,4
刊名	GEODERMA
	2022
卷号	405 页码:16
关键词	Northern Tibet Soil organic carbon Freeze-thaw cycles Modeling Climate change Permafrost region
ISSN号	0016-7061
DOI	10.1016/j.geoderma.2021.115455
通讯作者	Zhao, Dongsheng(zhaods@igsnrr.ac.cn)
英文摘要	Climate warming can enhance the decomposition of soil organic matter (SOM), thereby increasing the rate of carbon release from soils. In permafrost regions, climate warming alters the nature of freeze-thaw cycles by affecting sub-surface hydrology and soil temperature, thereby impacting the decomposition of SOM. However, this process is rarely considered in projections of the long-term dynamics of soil organic carbon (SOC) on the Tibetan Plateau (TP) in response to climate change. Here, we employ the CENTURY-FTC model, which implements a freeze-thaw module in the CENTURY model, to simulate the response of top soil organic carbon density (SOCD) at 0-20 cm depth to climate change in the permafrost region of Northern Tibet. Our findings suggest that (i) the average SOCD was 2.123 kg C m(-2) in 2015; (ii) the SOCD decreased at an average rate of 0.7 x 10(-3) kg C m(-2) year(-1) for the period 1961-2015; and (iii) SOCD decreases spatially from south to north across Northern Tibet. Under various climate scenarios, the SOCD is projected to decrease significantly throughout Northern Tibet from 2016 to 2050, with the decline being most pronounced under the representative concentration-pathway (RCP) 8.5 scenario, which projects an increase in global mean surface temperature of 4.5 degrees C by 2100. Superimposed on this pattern, regional differences might be driven by vegetation type, with the largest decrements occurring in southern, alpine-meadow-dominated areas and the smallest in the northern alpine desert. We propose that this declining trend will be enhanced as climate warming continues and might be amplified by the increase in freeze-thaw processes. The addition of a freeze-thaw module to the CENTURY model changes projections of SOCD change due to climate. Whereas the freeze-thaw cycle has had little impact during the baseline period, its influence is likely to increase as climate warming continues. By 2050, freeze-thaw processes are projected to contribute 3% to SOCD decline under the RCP2.6 scenario, which projects a rise in global mean surface temperature of 1.5 degrees C by 2100, and as much as 10% under the RCP8.5 scenario. In general, future warming is likely to result in declining SOCD throughout Northern Tibet and a reduction in the capacity of alpine soils to sequester carbon.
资助项目	National Natural Science Foundation of China[41571193] ; Second Tibetan Plateau Scientific Expedition and Research Program[2019QZKK0403] ; `Strategic Priority Research Program' of the Chinese Academy of Sciences[XDA20020202]
WOS关键词	EARTH SYSTEM MODEL ; ECOSYSTEM CARBON ; INNER-MONGOLIA ; MEADOW STEPPE ; ALPINE MEADOW ; PLATEAU ; DYNAMICS ; BIOMASS ; GRASSLANDS ; IMPACTS
WOS研究方向	Agriculture
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000703712100038
资助机构	National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program ; `Strategic Priority Research Program' of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/165819]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhao, Dongsheng
作者单位	1.Univ Chinese Acad Sci, 19A,Yuquan Rd, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, 11 A,Datun Rd, Beijing 100101, Peoples R China 3.East China Univ Technol, Res Ctr Resource & Environm Strategies, Sch Geomat, 418 Guanglan Rd, Nanchang 330013, Jiangxi, Peoples R China 4.NASG, Key Lab Watershed Ecol & Geog Environm Monitoring, Nanchang 330013, Jiangxi, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Dongsheng,Zhu, Yu,Wu, Shaohong,et al. Simulated response of soil organic carbon density to climate change in the Northern Tibet permafrost region[J]. GEODERMA,2022,405:16.
APA	Zhao, Dongsheng,Zhu, Yu,Wu, Shaohong,&Lu, Qing.(2022).Simulated response of soil organic carbon density to climate change in the Northern Tibet permafrost region.GEODERMA,405,16.
MLA	Zhao, Dongsheng,et al."Simulated response of soil organic carbon density to climate change in the Northern Tibet permafrost region".GEODERMA 405(2022):16.