Heterotrophic nitrification of organic nitrogen in soils: process, regulation, and ecological significance
文献类型： 外文期刊
作者： Gao, Wenlong 1 ; Fan, Changhua 1 ; Zhang, Wen 1 ; Li, Ning 1 ; Liu, Huiran 1 ; Chen, Miao 1 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Haikou 571101, Peoples R China
2.Hainan Danzhou Trop Agroecosystem Natl Observat &, Danzhou 571737, Peoples R China
3.Minist Agr & Rural Affairs, Key Lab Low carbon Green Agr Trop Reg China, Beijing, Peoples R China
4.Hainan Key Lab Trop Eco Circular Agr, Haikou 571101, Hainan, Peoples R China
5.Natl Long term Expt Stn Agr Green Dev, Natl Agr Expt Stn Agr Environm, Danzhou 571737, Hainan, Peoples R China
6.Guangdong Acad Sci, Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Integrated Agroenvironm Pollut C, Guangzhou 510650, Peoples R China
7.Natl Reg Joint Engn Res Ctr Soil Pollut Control &, Guangzhou 510650, Peoples R China
关键词： Heterotrophic nitrification; Heterotrophic nitrifiers; Soil acidity; Carbon limitation; Nitrogen mineralization; Heterotrophic ammonium oxidation
期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.5； 五年影响因子：6.9 ）
ISSN： 0178-2762
年卷期： 2023 年 59 卷 3 期
页码：
收录情况： SCI
摘要： Heterotrophic nitrification is regarded as an eternal mystery in the nitrogen (N) cycle, although it was first reported more than 100 years ago. In this review, we discuss microbial mechanisms driving heterotrophic nitrification of organic N (O-HORG) in soil and their modulations by pH, and carbon (C) and N contents. In acidic and oligotrophic soils, O-HORG may occur as endogenous respiration or during oxidation of recalcitrant organics and cell lysis. Likely in soils with a low C:N ratio and a high pH, C limitation of N immobilization creates conditions for the transformation of dissolved organic N to nitrate (NO3-). Fungi with a deficiency in ammonia mono-oxygenase can drive O-HORG. Heterotrophic nitrifiers include not only acid-tolerant, nitrophobic species, but also acid-sensitive, nitrotolerant species. There is concern about O-HORG in soil because of its contribution to NO3- production and nitrous oxide (N2O) emissions. Therefore, reliable measurements of soil heterotrophic nitrifying activity are needed. We propose more biochemical surveys to understand the pathway for O-HORG in ecologically relevant species, considering the challenges we are facing in managing heterotrophically derived nitrification to prevent N losses from cropland, forest, and grassland soils.
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