Organic carbon (C) plays an essential role in the denitrification process as it supplies energy for N2O, N2 and CO2 producing reactions. The objectives of this study were to: (i) rank the reactivity of different C compounds found in manures based on their availability for denitrification and (ii) explore C-quality in different C sources based on their capacity to promote denitrification. Evaluation of different C-sources in promoting denitrification was conducted based on the molar ratio of CO2 production to NO3− reduction after incubation. Results of the first experiment (a 12-day investigation) showed that glucose and glucosamine were highly reactive C compounds with all applied NO3− being exhausted by day 3, and glucosamine had significantly high amount of NH4+-N present at end of the experiment. The glucose and glucosamine treatments resulted in significantly greater cumulative CO2 production, compared to the other treatments. In the second experiment (a 9-day investigation), all NO3− had been depleted by day 6 and 9 from acetic acid and glucose, respectively, and the greatest cumulative CO2 production was from acetic acid. The CO2 appearance to NO3− molar ratios revealed that glucose and glucosamine were compounds with highly available C in the first experiment. In the second experiment, the pig slurry and acetic acid were found to be C-sources that promoted potential denitrification. The application of slurry to soil results in the promotion of denitrification and this depends on the availability of the C compounds it contains. Understanding the relationship between C availability and denitrification potential is useful for developing denitrification mitigation strategies for organic soil amendments.

中文翻译：

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评估不同碳源促进反硝化的潜力

有机碳 (C) 在反硝化过程中起着至关重要的作用，因为它为 N2在2和一氧化碳2产生反应。本研究的目的是：（i）根据粪便中发现的不同 C 化合物的反硝化可用性对它们的反应性进行排名，以及（ii）根据它们促进反硝化的能力探索不同 C 源中的 C 质量。基于CO摩尔比对不同碳源促进反硝化的评价2生产到 NO3-孵化后减少。第一个实验（为期 12 天的调查）的结果表明，葡萄糖和氨基葡萄糖是高反应性 C 化合物，所有应用的 NO3-第 3 天耗尽，氨基葡萄糖的 NH 含量显着升高4+-N 在实验结束时出现。葡萄糖和氨基葡萄糖处理导致显着更大的累积 CO2生产，与其他处理相比。在第二个实验（为期 9 天的调查）中，所有 NO3-分别在第 6 天和第 9 天耗尽了乙酸和葡萄糖，并且最大的累积 CO2由乙酸生产。一氧化碳2外观不3-摩尔比表明，葡萄糖和氨基葡萄糖是第一个实验中具有高可用 C 的化合物。在第二个实验中，发现猪粪和乙酸是促进潜在反硝化的碳源。将泥浆施用于土壤会促进反硝化，这取决于其所含 C 化合物的可用性。了解 C 有效性和反硝化潜力之间的关系有助于制定有机土壤改良剂的反硝化缓解策略。