干旱区生态环境知识资源中心(Arid): Mineral and Climatic Controls Over Soil Organic Matter Stability Across the Tibetan Alpine Permafrost Region

Arid

DOI	10.1029/2021GB007118
	Mineral and Climatic Controls Over Soil Organic Matter Stability Across the Tibetan Alpine Permafrost Region
	Fang, Kai; Chen, Leiyi; Qin, Shuqi; Zhang, Qiwen; Liu, Xuning; Chen, Pengdong; Yang, Yuanhe
通讯作者	Yang, YH (corresponding author)，Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China. ; Yang, YH (corresponding author)，Univ Chinese Acad Sci, Beijing, Peoples R China.
来源期刊	GLOBAL BIOGEOCHEMICAL CYCLES
ISSN	0886-6236
EISSN	1944-9224
出版年	2021
卷号	35 期号:12
英文摘要	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.
英文关键词	carbon cycle carbon-climate feedback permafrost mineral protection soil organic matter stability thermal analysis
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000735888800005
WOS关键词	CARBON DYNAMICS ; STORAGE ; TURNOVER ; STABILIZATION ; UNCERTAINTY ; PRESERVATION ; ECOSYSTEMS ; PROTECTION ; FRACTIONS ; RELEVANCE
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/375825
作者单位	[Fang, Kai; Chen, Leiyi; Qin, Shuqi; Zhang, Qiwen; Liu, Xuning; Yang, Yuanhe] Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China; [Fang, Kai; Qin, Shuqi; Liu, Xuning; Chen, Pengdong; Yang, Yuanhe] Univ Chinese Acad Sci, Beijing, Peoples R China; [Chen, Pengdong] 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],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).