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| DOI | 10.1029/2023JF007573 |
| Enhancing Soil Resilience to Climatic Wetting-Drying Cycles Through a Bio-Mediated Approach | |
| 发表日期 | 2024 |
| ISSN | 2169-9003 |
| EISSN | 2169-9011 |
| 起始页码 | 129 |
| 结束页码 | 5 |
| 卷号 | 129期号:5 |
| 英文摘要 | Climatic wetting-drying cycles exacerbated by climate change can trigger several weakening mechanisms in surface soils, potentially leading to instability and failure of slopes and earthen structures. This study proposes a bio-mediated approach based on microbially induced calcite precipitation (MICP) to increase soil resilience to wetting-drying cycles. To explore its viability and the underlying mechanisms, we conducted a series of laboratory tests on clayey soil that underwent six wetting-drying cycles. The tests were conducted with different treatment methods to investigate the effect of treatment sequence and cementation solution concentration. After MICP treatment, the initial evaporation rate, surface crack ratio during drying, and total soil weight loss during rainfall erosion were reduced by up to 32%, 85%, and 90%, respectively. Spraying the cementation solution first in the MICP treatment sequence proves more effective in improving soil water retention capacity. On the other hand, initiating the sequence with the bacterial solution demonstrates a more pronounced effect in reducing soil desiccation cracks and erosion. Microstructure analysis reveals that the content and distribution of CaCO3 precipitation are the major factors controlling the effectiveness of MICP for the cementation of clayey soil. Employing MICP can minimize the carbon footprint and contribute to developing environmentally friendly solutions for soil improvement in regions affected by climatic wetting-drying cycles. The rising frequency and intensity of climatic wetting-drying cycles driven by climate change pose a threat to surface soil stability, consequently increasing the risk of land degradation, soil erosion, landslide, and other forms of ground instabilities and failures. This study presents a bio-mediated approach using microbially induced calcite precipitation to enhance soil resilience to wetting-drying cycles. Experimental results show that MICP is capable of improving soil properties related to water retention, desiccation resistance, and erosion control. The microstructure analysis further elucidates the role of MICP-induced CaCO3 precipitation in cementing clayey soil and demonstrates that the bio-created buffer barrier significantly mitigates the adverse effect of climatic wetting-drying cycles on surface soil. This study is expected to offer an environmentally friendly and sustainable soil improvement solution in regions impacted by cascading climatic extremes. A sustainable bio-mediated approach using microbially induced calcite precipitation (MICP) was applied to enhance soil resilience to climatic wetting-drying cycles MICP significantly improves water retention, desiccation and erosion resistance of surface soil This study provides new insights into the fundamental mechanisms of the interaction between climate and MICP-treated soil |
| 英文关键词 | microbially induced calcite precipitation; climatic wetting-drying cycles; climate change; soil resilience; compound climatic events; soil microstructure |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:001227255000001 |
| 来源期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/289047 |
| 作者单位 | Nanjing University; Tufts University; Southeast University - China; Rowan University |
| 推荐引用方式 GB/T 7714 | . Enhancing Soil Resilience to Climatic Wetting-Drying Cycles Through a Bio-Mediated Approach[J],2024,129(5). |
| APA | (2024).Enhancing Soil Resilience to Climatic Wetting-Drying Cycles Through a Bio-Mediated Approach.JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE,129(5). |
| MLA | "Enhancing Soil Resilience to Climatic Wetting-Drying Cycles Through a Bio-Mediated Approach".JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE 129.5(2024). |
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