Direct measurements unveil overestimations in nitrous oxide emissions from legume-based strip intercropping

文献类型： 外文期刊

第一作者： Zhang, Jinchuan

作者： Zhang, Jinchuan;Liu, Qi;Xu, Yi;Chen, Yuanquan;Yang, Yadong;Zeng, Zhaohai;Zang, Huadong;Qian, Xin;Yang, Shengquan;Meng, Shaoyong;Peixoto, Leanne;Olesen, Jorgen E.

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关键词： Soil respiration; Interaction row; Grain yield; Nitrogen uptake; Strip width

期刊名称：EUROPEAN JOURNAL OF AGRONOMY （ 影响因子：5.5； 五年影响因子：5.9 ）

ISSN： 1161-0301

年卷期： 2025 年 168 卷

页码：

收录情况： SCI

摘要： Accurate evaluation of greenhouse gas (GHG) emissions from legume-based intercropping is key to supporting the agricultural green transition. However, current methods often ignore the direct emissions from the interspecific interaction row of legume/cereal intercropping. Here, a two-year field experiment was conducted to evaluate the difference between direct measurement and theoretical estimation of N2O emissions and soil respiration from maize/peanut and maize/soybean strip intercropping. Results showed that theoretical estimation overestimated the N2O emissions from interaction row by 12 - 15 % compared to direct measurement (P < 0.05). This overestimation occurred mainly during the N2O emissions peak (lasting 5 - 7 days) after topdressing N fertilization, which accounted for 21 - 49 % of the overestimation. Soil NH4+ and NO3- concentrations in the interaction row were 33 - 129 % and 26 - 96 % lower than the weighted average of the crop rows following topdressing N fertilization (P < 0.05). However, the soil respiration of the interaction row did not differ between direct measurement and theoretical estimation, which may indicate N is the key interaction elements for intercropped legume and cereal rather than carbon. Furthermore, the uncertainty in theoretical estimation of N2O emissions from legume-based intercropping was increases with the decrease of strip width, which mainly due to the increasing contribution of interaction zone. In conclusion, theoretical estimation can lead to an overestimation of N2O emissions, underscoring the necessity for direct measurement, especially as strip width narrows with increased proportion of interspecific interactions zones.

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