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Oxygen concentrations regulate NO, N 2 O, and N 2 kinetics and nitrogen transformation in a fluvo-aquic soil using a robotized incubation system
Journal of Soils and Sediments ( IF 2.8 ) Pub Date : 2021-01-16 , DOI: 10.1007/s11368-021-02878-2
Liuqing Yang , Gaodi Zhu , Xiaotang Ju , Rui Liu

Purpose

The current study aimed to (1) investigate the responses of N gases (NO, N2O, and N2) and mineral N (NH4+, NO2, and NO3) to the different O2 availability; (2) better understand the importance of O2 availability on N2O production pathways; and (3) provide evidence for making N2O mitigation measures in this agricultural soil.

Materials and methods

An incubation experiment with a fluvo-aquic soil was conducted using a robotized incubation system, with two added nitrogen sources (NH4+, NO2) under two initial O2 concentrations (21% and 0% v/v). Gas samples (3.5 ml) were collected every 8 h during the incubation, and soil samples were destructed collected at the beginning and the end of the incubation.

Results and discussion

Under initial condition of 21% O2, NH4+ combined with NO2 increased N2O emission especially at high NH4+ concentration (150 mg N kg−1). It is possibly because strong nitrification with high NH4+ addition caused a low O2 availability (< 6.2% v/v) which might have stimulated nitrifier denitrification or denitrification with N2O emission, and under initial condition of 0% O2, denitrification and anammox were the dominant processes, and N loss via gas depended on NO2 and NO3 concentration in the soil. Anammox might occur when NH4+ and NO2 were present, and this process should not be overlooked under anaerobic condition at the studied soil.

Conclusions

O2 controlled the soil microbiome processes in the fluvo-aquic soil under current conditions. Under aerobic condition, nitrification and nitrification-related process (nitrifier denitrification or denitrification) were the main N2O sources, and the nitrogenous gas kinetics depended on the rates of exogenous N and N types; while under anaerobic condition, denitrification contributed the most N2O and N2 production, which closely related with NO2 and NO3 concentration in the soil.



中文翻译:

使用机器人孵化系统,氧浓度调节潮土中的NO,N 2 O和N 2动力学以及氮转化

目的

目前研究的目的是(1)调查Ñ气体的反应(NO,N 2 O,和N 2)和无机氮(NH 4 +,NO 2 -和NO 3 - )的不同ö 2可用性; (2)更好地了解O 2可用性对N 2 O生产途径的重要性;(3)为在该农业土壤中采取N 2 O缓解措施提供证据。

材料和方法

用潮土的孵育实验用机器人系统的孵育进行,两个添加的氮源(NH 4 +,NO 2 - )下两个初始Ô 2种浓度(21%和0%V / V)。孵育期间每8小时收集一次气体样品(3.5 ml),并在孵育开始和结束时破坏土壤样品。

结果与讨论

下21%的O初始条件2,NH 4 +与NO合并2 -提高了氮肥2 O排放尤其是在高NH 4 +浓度(150毫克N-千克-1)。可能是因为添加大量NH 4 +的强硝化作用导致O 2利用率低(<6.2%v / v),这可能会刺激硝化器反硝化或N 2 O排放的反硝化,并且初始条件为0%O 2,脱氮和厌氧氨氧化为优势过程,并且经由气体N损失依赖于NO 2 -和NO 3土壤中的浓度。厌氧氨氧化时NH可能发生4 +和NO 2 -存在,而这个过程不应该被厌氧条件下,在所研究的土壤忽视。

结论

在当前条件下,O 2控制潮潮土壤中的微生物组过程。在有氧条件下,硝化和与硝化有关的过程(硝化器反硝化或反硝化)是主要的N 2 O来源,而氮气的动力学取决于外源N和N的类型。而厌氧条件下,脱硝贡献大多数N- 2 O和N 2的生产,这与NO密切相关的2 -和NO 3 -中的土壤浓度。

更新日期:2021-01-18
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