Impact of irrigation strategies on methane emission and absorption characteristics at different interfaces in rice field systems

文献类型： 外文期刊

第一作者： Liu, Lei

作者： Liu, Lei;Zhou, Sheng;Wang, Cong;Sun, Huifeng;Zhang, Xianxian;Zhang, Jining;Jiang, Zheng;Zhou, Sheng;Wang, Cong;Sun, Huifeng;Zhang, Xianxian;Zhang, Jining;Jiang, Zheng;Zhou, Sheng;Wang, Cong;Sun, Huifeng;Zhang, Xianxian;Zhang, Jining;Jiang, Zheng;Zhou, Sheng

作者机构：

关键词： Rice paddy; Irrigation regimes; Methane; Stable isotope; Interface exchange

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.0； 五年影响因子：3.4 ）

ISSN： 1439-0108

年卷期： 2025 年 25 卷 5 期

页码：

收录情况： SCI

摘要： PurposeRecent research has demonstrated that modifying irrigation strategies during rice cultivation can substantially reduce methane (CH4) emissions. Under specific irrigation strategies, rice paddies may even function as a sink for CH4. This study aims to elucidate how changes in irrigation strategies alter CH4 exchange between rice paddies and the atmosphere via the plant-atmosphere (P-A) and soil-atmosphere (S-A) interfaces, ultimately achieving CH4 emission reductions.MethodsContinuous monitoring of CH4 emissions was performed in water-saving and drought-resistance (WDR) rice fields under conventional irrigation (CI) and drought cultivation (DC) conditions. Synchronous in-situ 13C pulse labelling was applied during the tillering and booting stages to quantify CH4 emission and absorption at the P-A and S-A interfaces.ResultsUnder CI conditions, the seasonal cumulative CH4 emissions from WDR rice fields amounted to 85.1 +/- 18.5 kg CH4 hm-2, whereas DC led to a net seasonal absorption of 1.1 +/- 0.11 kg CH4 hm-2. The results of the 13C in-situ pulse labelling indicate that the substantial reduction in CH4 emissions from WDR rice fields under DC treatment, compared to CI treatment, is primarily due to decreased CH4 emissions at the P-A and S-A interfaces during the tillering stage. The net absorption of CH4 under DC treatment is mainly attributed to enhanced absorption fluxes at these interfaces during the booting stage.ConclusionThis study quantitatively evaluates the impact of various irrigation strategies on CH4 emission and absorption at different interfaces in rice field systems. Our findings reveal that irrigation strategies not only change the patterns of CH4 release from rice fields to the atmosphere but also influence their capacity to absorb atmospheric CH4. These results provide essential data for advancing research on irrigation-based technologies aimed at reducing CH4 emissions in rice cultivation.

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