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| DOI | 10.1016/j.soilbio.2024.109390 |
| Dual role of silt and clay in the formation and accrual of stabilized soil organic carbon | |
| 发表日期 | 2024 |
| ISSN | 0038-0717 |
| EISSN | 1879-3428 |
| 起始页码 | 192 |
| 卷号 | 192 |
| 英文摘要 | Soil organic carbon (SOC) is the largest terrestrial carbon (C) pool and is vulnerable to climate and land-use changes. Promoting the stabilization of SOC will reduce climate change-induced C losses. Mineral-associated organic carbon (MAOC), formed by the association of organic carbon with silt- and clay-sized minerals, is the major stabilized SOC fraction and key to sustaining soil health and mitigating climate change. However, the role of silt and clay in MAOC formation remains unclear in dryland ecosystems where microbes and plants are frequently under water stress. The current paradigm assumes that the main role of silt and clay is to adsorb and aggregate organic compounds. In a semi-arid environment, using a naturally occurring gradient of increasing soil silt and clay content partially due to aeolian dust inputs, we show that silt and clay also enhanced microbial decomposition of plant C inputs and microbial turnover, increasing microbial C inclusion into the MAOC pool. Finer-textured soils had higher soil water availability and higher volume of habitat available to microorganisms. The enhanced microbial processing interacted with changes in plant C inputs to further control the relative contribution of MAOC to SOC. Our results suggest SOC models should include soil textural effects on microbial activities and microbial C production in addition to physical protection of SOC. Our study also suggests that aeolian dust inputs can increase soil silt and clay contents and improve nutrient availability in dryland ecosystems, potentially mitigating the SOC loss under climate change and increasing the resilience of ecosystems to drought. |
| 英文关键词 | Dryland ecosystems; Microbial necromass; Mineral-associated organic carbon; Silt and clay; Soil moisture; Soil porosity |
| 语种 | 英语 |
| WOS研究方向 | Agriculture |
| WOS类目 | Soil Science |
| WOS记录号 | WOS:001207950100001 |
| 来源期刊 | SOIL BIOLOGY & BIOCHEMISTRY
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/286798 |
| 作者单位 | University of Wyoming; Colorado State University; University of California System; University of California Merced; University of California System; University of California Merced; Northern Arizona University; Nevada System of Higher Education (NSHE); University of Nevada Reno; Nevada System of Higher Education (NSHE); University of Nevada Reno; Chinese Academy of Sciences; Shenyang Institute of Applied Ecology, CAS; Tianjin University; University System of Maryland; University of Maryland College Park |
| 推荐引用方式 GB/T 7714 | . Dual role of silt and clay in the formation and accrual of stabilized soil organic carbon[J],2024,192. |
| APA | (2024).Dual role of silt and clay in the formation and accrual of stabilized soil organic carbon.SOIL BIOLOGY & BIOCHEMISTRY,192. |
| MLA | "Dual role of silt and clay in the formation and accrual of stabilized soil organic carbon".SOIL BIOLOGY & BIOCHEMISTRY 192(2024). |
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