Biochar application has been suggested as a strategy to decrease nitrous oxide emissions from agricultural soils while increasing soil C stocks, especially in tropical regions. Climate change, specifically increasing temperatures, will affect soil environmental conditions and thereby directly influence soil N2O fluxes. Here, we show that Miscanthus giganteus biochar applied at high rates suppresses the typical warming-induced stimulation of N2O emissions. Specifically, in experiments with high biochar addition (25 Mg ha−1), N2O emissions under 40°C were equal to or even lower compared to those observed at 20°C. In this sense, the mitigation potential of biochar for N2O emissions might increase under the auspices of climate change.

中文翻译：

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生物炭的高施用率以减轻在变暖条件下施氮肥的热带土壤中的 N2O 排放

生物炭应用已被建议作为减少农业土壤中一氧化二氮排放同时增加土壤碳储量的策略，特别是在热带地区。气候变化，特别是温度升高，将影响土壤环境条件，从而直接影响土壤 N2O 通量。在这里，我们展示了以高速率应用的 Miscanthus giganteus biochar 抑制了典型的变暖引起的 N2O 排放刺激。具体而言，在添加高生物炭（25 Mg ha-1）的实验中，40°C 下的 N2O 排放量与 20°C 下观察到的排放量相等甚至更低。从这个意义上说，在气候变化的支持下，生物炭对 N2O 排放的减缓潜力可能会增加。