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Biochar-based urea increases soil methane uptake in a subtropical forest
Geoderma ( IF 5.6 ) Pub Date : 2024-08-07 , DOI: 10.1016/j.geoderma.2024.116994 Jiashu Zhou , Caixian Tang , Yakov Kuzyakov , Tony Vancov , Yunying Fang , Xinzhang Song , Xuhui Zhou , Zhenhui Jiang , Tida Ge , Lin Xu , Yanjiang Cai , Bing Yu , Jason C. White , Baojing Gu , Xinli Chen , Philippe Ciais , Yongfu Li
Geoderma ( IF 5.6 ) Pub Date : 2024-08-07 , DOI: 10.1016/j.geoderma.2024.116994 Jiashu Zhou , Caixian Tang , Yakov Kuzyakov , Tony Vancov , Yunying Fang , Xinzhang Song , Xuhui Zhou , Zhenhui Jiang , Tida Ge , Lin Xu , Yanjiang Cai , Bing Yu , Jason C. White , Baojing Gu , Xinli Chen , Philippe Ciais , Yongfu Li
Novel biochar-based fertilizers, produced by combining biochar particles with chemical fertilizers, have strong potential to enrich soil with carbon (C) and nitrogen (N), and to increase plant productivity. Application of biochar-based fertilizers modifies soil microbial community compositions, thereby influencing greenhouse gas emissions, including methane (CH4 ) fluxes. Due to the improved aeration in soils amended with biochar particles, we hypothesized that biochar-based urea would decrease CH4 production and increase CH4 oxidation, leading to increase of total CH4 uptake by soil. A three-year field experiment was conducted in a subtropical Moso bamboo forest to compare the impacts of biochar-based urea and traditional urea on seasonal CH4 uptake by soil, as well as on soil physicochemical and microbial attributes. Urea application lowered the annual soil CH4 uptake by 6 % and 16 % at 100 and 300 kg N/ha, respectively, within the first year. Biochar-based urea application at 300 kg N/ha increased the annual CH4 uptake by 12 % in both the first and second years, whereas the effects weakened over time. Soil CH4 uptake was positively correlated with CH4 oxidation rate but negatively with CH4 production rate. The urea-induced decrease in CH4 uptake was attributed to the increased NH4 + and NO3 − contents and mcrA gene abundance as well as decreased pmoA/mcrA ratio, thereby increasing CH4 production rate. The biochar-based urea increased CH4 uptake by enhanced soil aeration and labile C supply, which created favorable conditions for methanotrophs. This resulted in increased pmoA gene abundance and the pmoA /mcrA ratio, thereby accelerating CH4 oxidation. Overall, these findings underscore the potential of biochar-based fertilizers in augmenting CH4 uptake within subtropical forest soils. Notably, the transition from traditional urea to biochar-based urea in China Moso bamboo forests alone has the potential to lift annual soil CH4 uptake by an estimated 4450 t.
更新日期：2024-08-07
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