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| 土壤反硝化产物N2O/N2化学计量比例研究进展 |
| Research progresses on stoichiometric proportion of soil denitrification products N2O/N2 |
| 投稿时间：2022-10-24 修订日期：2022-12-10 |
| DOI： |
| 中文关键词: 土壤反硝化 气态产物比 环境因素 机理 研究进展 |
| 英文关键词: Soil denitrification Gaseous product ratio Environmental factors Mechanism Research progresses |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要: |
| 反硝化作用是土壤氮循环中最重要的活性氮移除途径之一。在这一过程中，硝态氮被还原为气态氮素氧化亚氮（N2O）或氮气（N2）等离开土壤进入大气，而其气态产物N2O/N2化学计量比是土壤反硝化研究的热点和难点，合理调控该比例是减少农业源温室气体排放的重要途径。在土壤环境中，反硝化产物比受多种因素的影响，硝态氮含量、氧气和Cu离子有效性是介导产物比变化的关键影响因子，而电子供体量、pH、水分为一般影响因子。这些因素既可以通过影响反硝化酶活、反硝化微生物丰度和群落结构等直接作用于反硝化过程，也可以通过改变反硝化发生的土壤微环境间接影响反硝化产物比。本文综述了近年来土壤反硝化气态产物N2O/N2比控制因素的相关进展，并讨论了其对不同影响因素变化的响应机理，以期为后续相关研究提供部分思路和背景。 |
| 英文摘要: |
| Denitrification is one of the most important reactive nitrogen removal pathways in soil nitrogen cycle. In this process, nitrate is reduced to gaseous nitrogen nitrous oxide (N2O) or nitrogen (N2), which leaves the soil and enters the atmosphere, and the stoichiometric ratio of its gaseous product N2O/N2 is a hot topic in soil denitrification research. Reasonable regulation of this ratio is an important way to reduce greenhouse gas emissions from agricultural sources. In the soil environment, the ratio of denitrification products is affected by many factors, our view is that nitrate content, oxygen and Cu availability are the key factors to mediate the change of product ratio, while electron donor, pH and moisture are general factors. These factors can directly affect the denitrification process by affecting denitrifying enzyme activity, denitrifying microorganism abundance and community structure. It can also indirectly affect the ratio by changing the soil microenvironment of denitrification. In this paper, the progress of controlling factors of soil denitrification gaseous product ratio N2O/N2 in recent years was reviewed, and the response mechanism of denitrification product N2O/N2 ratio to different influencing factors was discussed to provide some inspiration for the future related research. |
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