Mineral and Climatic Controls Over Soil Organic Matter Stability Across the Tibetan Alpine Permafrost Region
文献类型：期刊论文
| 作者 | Fang, Kai3; Chen, Leiyi; Qin, Shuqi3; Zhang, Qiwen; Liu, Xuning3; Chen, Pengdong2,3; Yang, Yuanhe3
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| 刊名 | GLOBAL BIOGEOCHEMICAL CYCLES
 |
| 出版日期 | 2021 |
| 卷号 | 35期号:12 |
| 关键词 | carbon cycle carbon-climate feedback permafrost mineral protection soil organic matter stability thermal analysis |
| ISSN号 | 0886-6236 |
| DOI | 10.1029/2021GB007118 |
| 文献子类 | Article |
| 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. |
| 学科主题 | Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences |
| 出版地 | WASHINGTON |
| 电子版国际标准刊号 | 1944-9224 |
| 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) |
| 语种 | 英语 |
| WOS记录号 | WOS:000735888800005 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 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] |
| 源URL | [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, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden, Wuhan, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, 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). |
入库方式： OAI收割
来源：植物研究所
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