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| DOI | 10.1016/j.epsl.2024.118584 |
| Competition or collaboration: Clay formation sets the relationship between silicate weathering and organic carbon burial in soil | |
| 发表日期 | 2024 |
| ISSN | 0012-821X |
| EISSN | 1385-013X |
| 起始页码 | 628 |
| 卷号 | 628 |
| 英文摘要 | Silicate weathering and organic carbon (OC) burial in soil regulate atmospheric CO2, but their influence on each other remains unclear. Generally, OC oxidation can generate acids that drive silicate weathering, yet clay minerals that form during weathering can protect OC and limit oxidation. This poses a conundrum where clay formation and OC preservation either compete or cooperate. Debate remains about their relative contributions because quantitative tools to simultaneously probe these processes are lacking while those that exist are often not measured in concert. Here we demonstrate that Li isotope ratios of sediment, commonly used to trace clay formation, can help constrain OC cycling. Measurements of river suspended sediment from two watersheds of varying physiography and analysis of published data from Hawaii soil profiles show negative correlations between solid-phase delta 7Li values and OC content, indicating the association of clay mineral formation with OC accumulation. Yet, the localities differ in their ranges of delta 7Li values and OC contents, which we interpret with a model of soil formation. We find that temporal trends of Li isotopes and OC are most sensitive to mineral dissolution/clay formation rates, where higher rates yield greater OC stocks and lower delta 7Lisolivalues. Whereas OC-enhanced dissolution primarily dictates turnover times of OC and silicate minerals, clay protection distinctly modifies soil formation pathways and is likely required to explain the range of observations. These findings underscore clay mineral formation, driven primarily by bedrock chemistry and secondarily by climate, as a principal modulator of weathering fluxes and OC accumulation in soil. |
| 英文关键词 | organic matter stabilization; clay formation; climate change; lithium isotopes; carbon cycle |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:001173466700001 |
| 来源期刊 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/300447 |
| 作者单位 | Rice University; Rice University; Brown University; Brown University; University of Chicago; Nevada System of Higher Education (NSHE); University of Nevada Reno; University of Colorado System; University of Colorado Boulder; Helmholtz Association; Helmholtz-Center Potsdam GFZ German Research Center for Geosciences |
| 推荐引用方式 GB/T 7714 | . Competition or collaboration: Clay formation sets the relationship between silicate weathering and organic carbon burial in soil[J],2024,628. |
| APA | (2024).Competition or collaboration: Clay formation sets the relationship between silicate weathering and organic carbon burial in soil.EARTH AND PLANETARY SCIENCE LETTERS,628. |
| MLA | "Competition or collaboration: Clay formation sets the relationship between silicate weathering and organic carbon burial in soil".EARTH AND PLANETARY SCIENCE LETTERS 628(2024). |
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