数字农科院2.0

Enhanced anaerobiosis and increased carbon input boost microbial-mediated carbon sequestration in paddy irrigation-drainage units

文献类型： 外文期刊

作者： Wang, Shaopeng;Yin, Yinghua;Zhang, Fulin;Liao, Yongxin;Zhou, Yan;Liu, Hongbin;Zhai, Limei

作者机构：

关键词： Carbon sequestration;Greenhouse gas emission;Irrigation-drainage units;Macrogenome

期刊名称： AGRICULTURE ECOSYSTEMS & ENVIRONMENT

ISSN： 0167-8809

年卷期： 2026 年 399 卷

页码：

收录情况： SCIE（2025版）

摘要： Enhancing carbon sequestration in rice paddies while mitigating greenhouse gas (GHG) emissions is a critical environmental challenge. Rice field management typically occurs within irrigation and drainage units (IDUs), which comprise paddies and ditches. However, comprehensive studies on microbial carbon cycle processes within IDUs are scarce. This study examined GHG emissions, carbon storage, microbial metagenomics, and physicochemical properties of two types of IDUs with different anaerobic conditions and carbon inputs: rice-- wheat (RW) rotation and rice-crayfish (RC) rotation. Findings indicate that the greatest divergence in microbial functional traits for carbon cycling between the ditch and paddy was in carbon fixation, in which the ditch acted as a carbon source and the paddy served as a carbon sink in RW IDUs. The input and balance of carbon and nitrogen are limiting factors for microbial carbon turnover in long-term anaerobic ditches. The RC ditch with simultaneous additional carbon and nitrogen inputs from feed increased microbial carbon turnover and accumulation compared with the RW ditch that only receives runoff nitrogen. The duration of anaerobic conditions becomes the decisive factor for carbon accumulation in paddies under substantial concurrent carbon and nitrogen inputs. In continuously flooded RC paddy fields, the winter season witnessed a 29.5 % increase in carbon-fixing microbes and a 14.0 % decrease in carbon-metabolizing microbes, leading to a 91.6 % reduction in respiration rates and a 53.8 % increase in net ecosystem carbon budget. Notably, the persistence of anoxic conditions augments methane emissions in RC IDUs, particularly through aceticlastic methanogenesis. Comprehensive analysis indicates that the overall net global warming potential for the RW IDUs escalates to 27,603.2 kg center dot ha-1, which is 4.23 times that of the RC IDUs. This study underscores the microbial-mediated carbon cycling within two distinct IDUs, offering vital insights into carbon sequestration enhancement and emission reduction in rice agricultural practices.

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