气候变化领域集成服务门户(CCPortal): Combination of mineral protection and molecular characteristics rather than alone to govern soil organic carbon stability in Qinghai-Tibetan plateau wetlands

CCPortal

DOI	10.1016/j.jenvman.2023.118757
	Combination of mineral protection and molecular characteristics rather than alone to govern soil organic carbon stability in Qinghai-Tibetan plateau wetlands
	Zhao, Wenwen; Zhang, Zhongsheng; Zhang, Xuehui; Xu, Lei; Guan, Qiang; Lu, Kangle; Wu, Haitao; Wang, Wenfeng
发表日期	2023
ISSN	0301-4797
EISSN	1095-8630
卷号	344
英文摘要	Wetlands in the Yarlung Tsangpo River Basin (YTR) on the Qinghai-Tibet Plateau provide immense soil organic carbon (SOC) storage, which is highly susceptible to climate warming and requires urgent deciphering SOC stabilization mechanisms of long-term protection of SOC against decomposition. Conflicting views exist regarding whether persistent SOC is controlled by molecular features or by mineral protection. As such, this study quantified SOC stability using two thermal indices (TG-T50, and DSC), described molecular features of SOC using pyrolysis-gas chromatography-mass spectrometry, and measured SOC protection by minerals using a chemical extraction method. Results indicated SOC of topsoils had higher thermal stability, with TG-T50 and DSC-T50 of 337.61 degrees C and 384.58 degrees C, than that of subsoils with TG-T50 and DSC-T50 of 337.32 and 382.67 degrees C, respectively. We found subsoils had significantly higher proportions of aliphatic and aromatic compounds, while existed higher SOC associated with minerals. It seemed SOC stabilization differed with soil depths, in which mineral protection dictated SOC thermal stability in topsoils while molecular features posed a more important constraint on SOC stabilization in subsoils. Overall, our findings support the hypothesis of physical and chemical protection but emphasized that SOC thermal stability largely depended on to extent of the combination between molecular features and mineral protection, which explained 55% in topsoils and 73% in subsoils, respectively.
关键词	Soil organic carbon Thermal stability Molecular Minerals Tibetan plateau
英文关键词	LITTER DECOMPOSITION; HUMIC ACIDS; MATTER; STABILIZATION; PERMAFROST; STORAGE; IRON
WOS研究方向	Environmental Sciences
WOS记录号	WOS:001148231400001
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283689
作者单位	Chinese Academy of Sciences; Northeast Institute of Geography & Agroecology, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Beijing Normal University
推荐引用方式 GB/T 7714	Zhao, Wenwen,Zhang, Zhongsheng,Zhang, Xuehui,et al. Combination of mineral protection and molecular characteristics rather than alone to govern soil organic carbon stability in Qinghai-Tibetan plateau wetlands[J],2023,344.
APA	Zhao, Wenwen.,Zhang, Zhongsheng.,Zhang, Xuehui.,Xu, Lei.,Guan, Qiang.,...&Wang, Wenfeng.(2023).Combination of mineral protection and molecular characteristics rather than alone to govern soil organic carbon stability in Qinghai-Tibetan plateau wetlands.JOURNAL OF ENVIRONMENTAL MANAGEMENT,344.
MLA	Zhao, Wenwen,et al."Combination of mineral protection and molecular characteristics rather than alone to govern soil organic carbon stability in Qinghai-Tibetan plateau wetlands".JOURNAL OF ENVIRONMENTAL MANAGEMENT 344(2023).