Interactive effects of warming and drought on soil organic carbon sequestration and methane uptake in straw and biochar amended soils: Mechanisms and global implications

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2025-06-23 DOI:10.1016/j.cej.2025.164817

Jitong Lin, Guopeng Liang, Marcela Hernández, Zhiyu Xu, Yinghao Xue, Renhua Sun, Yuanfeng Sun, Lulu Dai, Yanhong Lou, Haojie Feng, Hui Wang, Quangang Yang, Hongjie Di, Hong Pan, Yuping Zhuge

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Abstract

The interactive effects of warming and drought on soil carbon-methane feedback in straw- versus biochar-amended agricultural systems need more comprehensive quantification, despite their critical implications for climate-smart soil management. By integrating controlled incubation experiments with a global meta-analysis (105 observations), we revealed that drought suppressed CH₄ uptake by 58.9% in carbon-amended soils through synergistic depletion of methanotrophic functional capacity (pmoA gene abundance) and microbial biomass carbon, while attenuating thermal sensitivity of methane uptake. Crucially, warming triggered opposing methane sink responses: it stimulated uptake in straw-amended soils (by 15.4%, CI: −0.348 to 0.656), yet collapsed methanotrophy in biochar systems (by −78.4%, CI: −1.167 to −0.401), mechanistically linked to thermal disruption of methanotroph community integrity and pmoA gene expression. Structural equation modeling further exposed biochar-induced vulnerability, where warming directly suppressed pmoA abundance (r = −0.691, p < 0.001), overriding its carbon stabilization benefits. Globally synthesized data unveiled paradoxical soil organic carbon dynamics under warming—short-term losses vs. long-term accruals—highlighting the imperative for decade-scale in situ validations. Our findings established an amendment-specific biogeochemical framework, demonstrating that straw and biochar follow divergent carbon-climate trajectories: the former enhanced methane sink resilience but risked soil organic carbon instability, while the latter traded carbon persistence for methanotrophic functional collapse. This work redefined climate-smart amendment strategies by embedding microbial metabolic gatekeeping into Earth system models, providing actionable pathways for sustainable agroecosystem management under accelerating climate extremes.

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增温和干旱对秸秆和生物炭改性土壤有机碳固存和甲烷吸收的交互影响：机制和全球意义

在秸秆与生物炭改良的农业系统中，气候变暖和干旱对土壤碳-甲烷反馈的交互影响需要更全面的量化，尽管它们对气候智慧型土壤管理具有重要意义。通过对照培养实验和105项全球荟萃分析，我们发现干旱通过甲烷营养功能（pmoA基因丰度）和微生物生物量碳的协同耗竭抑制了碳修正土壤中58.9%的CH4吸收，同时减弱了甲烷吸收的热敏性。至关重要的是，变暖引发了相反的甲烷汇反应：它刺激了秸秆改良土壤的吸收（15.4%,CI:−0.348至0.656），但生物炭系统的甲烷化降解（- 78.4%,CI:−1.167至−0.401），这与热破坏甲烷化菌群落完整性和pmoA基因表达有机械联系。结构方程模型进一步揭示了生物炭诱导的脆弱性，其中变暖直接抑制了pmoA丰度（r = −0.691,p <； 0.001），超过了其碳稳定效益。全球综合数据揭示了气候变暖下矛盾的土壤有机碳动态——短期损失与长期累积——强调了十年尺度的原位验证的必要性。我们的研究结果建立了一个特定于修正的生物地球化学框架，表明秸秆和生物炭遵循不同的碳-气候轨迹：前者增强了甲烷汇的恢复能力，但有土壤有机碳不稳定的风险，而后者以碳持久性换取甲烷营养功能崩溃。这项工作通过将微生物代谢把关嵌入到地球系统模型中，重新定义了气候智慧型修正策略，为加速极端气候下的可持续农业生态系统管理提供了可行途径。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.