The effect of biochar and nitrapyrin (a nitrification inhibitor) applications on nitrous oxide (N 2 O) emissions from a cropland soil was studied in a 35-day incubation experiment. The biochars were produced using canola ( Brassica napus L.) straw under two pyrolysis temperatures: 300 (BC300) and 700 °C (BC700). Biochars (20 g kg −1 soil) and nitrapyrin (80 mg kg −1 soil) were applied alone or in combination. The cumulative N 2 O emissions were affected by both biochar and nitrapyrin applications ( p < 0.05, same below) but not by their interaction. Cumulative N 2 O emissions were not affected by BC700, but were increased by BC300, as compared with the CK treatment (no biochar addition). Nitrapyrin significantly decreased cumulative N 2 O emissions by inhibiting nitrification, whether biochar was applied or not. There were positive relationships ( p < 0.05) between cumulative N 2 O emissions and soil microbial biomass carbon to nitrogen ratio, nitrate and dissolved organic nitrogen concentrations, and net nitrification rates. Our results show that biochars need to be appropriately selected (such as the use of BC700) that do not increase N 2 O emissions, while the effectiveness of nitrapyrin in reducing N 2 O emissions was not affected by the co-application of biochars. We conclude that the co-application of biochar and nitrapyrin may be able to both increase soil C sequestration by the addition of stable C contained in the biochar and reduce N 2 O emissions from agricultural production systems.

中文翻译：

---

不同热解温度下产生的油菜秸秆生物炭和硝基吡啶独立影响农田土壤一氧化二氮排放

在为期 35 天的孵化实验中，研究了生物炭和硝化比林（一种硝化抑制剂）应用对农田土壤中一氧化二氮 (N 2 O) 排放的影响。生物炭是在两种热解温度下使用油菜 (Brassica napus L.) 秸秆生产的：300 (BC300) 和 700 °C (BC700)。生物炭（20 g kg -1 土壤）和硝唑（80 mg kg -1 土壤）单独或组合施用。累积 N 2 O 排放受生物炭和硝基吡喃应用的影响（p < 0.05，下同），但不受它们相互作用的影响。与 CK 处理（不添加生物炭）相比，累积 N 2 O 排放不受 BC700 的影响，但增加了 BC300。Nitrapyrin 通过抑制硝化作用显着降低累积 N 2 O 排放，无论是否使用生物炭。累积 N 2 O 排放量与土壤微生物生物量碳氮比、硝酸盐和溶解有机氮浓度以及净硝化率之间存在正相关关系 (p < 0.05)。我们的研究结果表明，生物和BC700的使用需要适当地选择，而Nitrapyrin在减少N 2 O排放中的有效性不受Biochars的影响。我们得出结论，生物炭和硝基吡喃的共同应用可能能够通过添加生物炭中含有的稳定碳来增加土壤碳封存，并减少农业生产系统中的 N 2 O 排放。和净硝化率。我们的研究结果表明，生物和BC700的使用需要适当地选择，而Nitrapyrin在减少N 2 O排放中的有效性不受Biochars的影响。我们得出结论，生物炭和硝基吡喃的共同应用可能能够通过添加生物炭中含有的稳定碳来增加土壤碳封存，并减少农业生产系统中的 N 2 O 排放。和净硝化率。我们的研究结果表明，生物和BC700的使用需要适当地选择，而Nitrapyrin在减少N 2 O排放中的有效性不受Biochars的影响。我们得出结论，生物炭和硝基吡喃的共同应用可能能够通过添加生物炭中含有的稳定碳来增加土壤碳封存，并减少农业生产系统中的 N 2 O 排放。