数字农科院2.0

Combining non-legume green manure with a nitrification inhibitor mitigates N2O emission and facilitates N recovery from red hilly soil

文献类型： 外文期刊

作者： Bing Xu;Kaihong Zhang;Zhong Zhang;Dongyang Gui;Shuanglei Song;Zhipeng Sha

作者机构：

关键词： 15N recovery;Green manure;N2O emission;NH3 volatilization

期刊名称： Journal of Environmental Management

ISSN： 0301-4797

年卷期： 2026 年 398 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： While green manure (GM) incorporation is recognized for improving soil fertility and potentially enhancing nitrogen use efficiency (NUE), concerns persist regarding stimulated nitrous oxide (N2O) emissions. Furthermore, a clear understanding of the fate of nitrogen derived from GM (NdfGM) and its complex interactions with N fertilizers is currently lacking. This study established a greenhouse experiment where 30 % of synthetic fertilizer (U) was replaced by either milk vetch (MV) alone or MV combined with Brachiaria decumbens (B), with or without a nitrification inhibitor (NI), or with Sorghum (S). Utilizing a 15N cross-labeling approach, quantified N recovery within the soil-crop (water spinach) system while simultaneously measuring gaseous N emissions (N2O, NO, NH3) and CO2. Key trade-offs emerged: (MV + U) gave the highest crop N recovery (25.80 % NdfGM; 37.10 % NdfU) but also the largest N2O and NO emissions (NH3 was low). The (MV + B) + U treatment reduced N2O and NO by 52.94 % and 13.30 % compared with MV + U, respectively. Including NI (MV + B + NI) further lowered N2O/NO over 50 % (versus MV + U), increased urea-N recovery in soil, but raised NH3 volatilization. Conversely, (MV + S) showed the lowest N recoveries, highest total N losses, and highest CO2 emissions. Structural equation modeling identified soil NO2−-N as the key driver of N2O production, while soil temperature and pH governed NH3 fluxes. This evidence highlights that strategic mixed GM species combined with NIs offer a promising approach. It facilitates improved N recovery within the soil-crop system while simultaneously mitigating key N emission pathways. These findings offer direct technical support for developing sustainable farmland N management strategies.

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