Mineral and Climatic Controls Over Soil Organic Matter Stability Across the Tibetan Alpine Permafrost Region

doi:10.1029/2021GB007118

	Mineral and Climatic Controls Over Soil Organic Matter Stability Across the Tibetan Alpine Permafrost Region
	Fang, Kai 1; Chen, Leiyi ; Qin, Shuqi 1; Zhang, Qiwen ; Liu, Xuning 1; Chen, Pengdong 1,2; Yang, Yuanhe1
	2021
发表期刊	GLOBAL BIOGEOCHEMICAL CYCLES
ISSN	0886-6236
卷号	35 期号:12
摘要	Permafrost thaw could accelerate microbial decomposition, lead to greenhouse gases emissions into the atmosphere, and thus trigger a positive feedback to climate warming. As a key parameter reflecting the resistance of soil organic matter (SOM) to be decomposed by microorganisms, SOM stability may determine the strength of permafrost carbon (C)-climate feedback. Adequate understanding of patterns and drivers of SOM stability can thus contribute to predicting permafrost C cycle and its feedback to climate change. However, due to limited observations, it remains unknown whether biochemical selectivity or physico-chemical protection dominates SOM stability in permafrost regions. By combining large-scale soil sampling, thermal analysis and random forest model, we quantified SOM stability in the top 10 cm using thermogravimetry and differential scanning calorimetry, and explored its spatial patterns across the Tibetan alpine permafrost region. We then constructed structural equation model to evaluate the relative importance of climatic variables, edaphic properties, substrate quality, and mineral variables in regulating SOM stability over a broad geographic scale. Our results indicated that SOM stability exhibited an increasing tendency from the southeastern to northwestern plateau. The stronger SOM stability was associated with higher mineral-organic associations and more arid conditions. By contrast, substrate quality had limited effects on SOM stability. Overall, these results provide large-scale evidence for the physico-chemical protection hypothesis, highlighting the importance of considering mineral variables in Earth system models to better predict soil C dynamics across permafrost regions.
关键词	carbon cycle carbon-climate feedback permafrost mineral protection soil organic matter stability thermal analysis
学科领域	Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
DOI	10.1029/2021GB007118
收录类别	SCI
语种	英语
WOS关键词	CARBON DYNAMICS ; STORAGE ; TURNOVER ; STABILIZATION ; UNCERTAINTY ; PRESERVATION ; ECOSYSTEMS ; PROTECTION ; FRACTIONS ; RELEVANCE
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000735888800005
出版者	AMER GEOPHYSICAL UNION
文献子类	Article
出版地	WASHINGTON
EISSN	1944-9224
资助机构	National Natural Science Foundation of China [31825006, 31988102, 91837312] ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program [2019QZKK0106, 2019QZKK0302] ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDB-SSW-SMC049]
作者邮箱	yhyang@ibcas.ac.cn
引用统计	被引频次：11[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/26778
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden, Wuhan, Peoples R China
推荐引用方式 GB/T 7714	Fang, Kai,Chen, Leiyi,Qin, Shuqi,et al. Mineral and Climatic Controls Over Soil Organic Matter Stability Across the Tibetan Alpine Permafrost Region[J]. GLOBAL BIOGEOCHEMICAL CYCLES,2021,35(12).
APA	Fang, Kai.,Chen, Leiyi.,Qin, Shuqi.,Zhang, Qiwen.,Liu, Xuning.,...&Yang, Yuanhe.(2021).Mineral and Climatic Controls Over Soil Organic Matter Stability Across the Tibetan Alpine Permafrost Region.GLOBAL BIOGEOCHEMICAL CYCLES,35(12).
MLA	Fang, Kai,et al."Mineral and Climatic Controls Over Soil Organic Matter Stability Across the Tibetan Alpine Permafrost Region".GLOBAL BIOGEOCHEMICAL CYCLES 35.12(2021).

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