引用本文:颜青,赖睿特,张克强,等.土壤化学反硝化及N2O产生机理研究进展[J].环境科学研究,2020,33(3):736-743.
YAN Qing,LAI Ruite,ZHANG Keqiang,et al.Research Progress on Soil Chemical Denitrification and N2O Production Mechanism[J].Research of Environmental Sciences,2020,33(3):736-743.]
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土壤化学反硝化及N2O产生机理研究进展
颜青, 赖睿特, 张克强, 杨涵博, 王风
农业农村部环境保护科研监测所, 天津 300191
摘要:
传统观点认为土壤氮素转化要有微生物的参与,但越来越多的研究发现,非生物转化在一些特定条件下同样发挥着不可忽略的作用,该途径下N2O产生量甚至超过生物学过程而占主导作用.作为一种重要的非生物土壤氮素转化方式,化学反硝化产生途径虽然已经被发现近一个世纪,但在现代生态学研究中通常因研究分散而往往被忽视.鉴于此,对土壤化学反硝化及N2O产生机制、影响因素的研究进展进行总结,并对化学反硝化的不足和薄弱环节提出展望.结果表明:土壤化学反硝化及N2O产生的机制主要包括高价氮还原和羟胺分解两种作用;影响土壤化学反硝化的因素主要包括pH、温度、反应底物浓度、有机质、固相界面及金属离子,如高pH、固相界面和Cu2+的存在均会促进化学反硝化过程;不同形态Fe直接参与化学反硝化生成N2O的途径不同,主要包括Fe2+还原NO2-和NO3-,Fe3+氧化NH2OH.然而,现有研究对于化学反硝化机理的边界划分等问题仍不明确,因此,建议强化羟胺在土壤化学反硝化途径中作用机理的基础性研究,以及多因素综合影响下化学反硝化强度和N2O产生特征方面的应用性研究.
关键词:  土壤  化学反硝化  N2O  进展  羟胺  
DOI:10.13198/j.issn.1001-6929.2019.08.16
分类号:X506
基金项目:国家重点研发计划项目(No.2017YFD0800403);中国博士后科学基金项目(No.2018M640209);农业农村部财政项目
Research Progress on Soil Chemical Denitrification and N2O Production Mechanism
YAN Qing, LAI Ruite, ZHANG Keqiang, YANG Hanbo, WANG Feng
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Abstract:
Previous studies demonstrated that soil nitrogen transformation was related to microorganisms. However, more recent studies found that abiotic transformation also played an important role under certain conditions. N2O production by this pathway even exceeds the biological process and plays a dominant role. As an important nitrogen transformation way in soils, chemical denitrification process was discovered for nearly a century, but it is often ignored due to scattered research. Thus, we summarized the research progresses of soil chemical denitrification, N2O production mechanism and influencing factors, and pointed out the deficiencies and weaknesses of chemical denitrification. It showed that the mechanism of soil chemical denitrification and N2O production mainly included the processes of high valence nitrogen reduction and hydroxylamine decomposition; the factors affecting soil chemical denitrification mainly included pH, temperature, substrate concentration, organic matter, solid phase interface and metal ions. Chemical denitrification can be promoted by high pH value, solid phase interface and Cu2+. Different forms of iron directly involved in the process of chemical denitrification by different ways. NO2- and NO3- were reduced by Fe2+. And Fe3+ directly involved in the oxidation of NH2OH. However, in recent studies, the boundary demarcation of chemical denitrification mechanism and other problems were still unclear. The mechanism of hydroxylamine in soil chemical denitrification should be paid more attentions, and researches regarding the effect of multiple factors on soil chemical denitrification were highly expected.
Key words:  soil  chemical denitrification  N2O  progress  hydroxylamine  iron