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Temperature decouples ammonia and nitrite oxidation in greenhouse vegetable soils. | LitMetric

Temperature decouples ammonia and nitrite oxidation in greenhouse vegetable soils.

Sci Total Environ

Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China. Electronic address:

Published: September 2020

AI Article Synopsis

Article Abstract

The influence of temperature on soil ammonia (NH) and nitrite (NO) oxidation and related NO accumulation in soils remain unclear. The soil potential NH oxidation (PAO) and NO oxidation (PNO) rates were evaluated over a temperature gradient of 5-45 °C in six greenhouse vegetable soils using inhibitors. The values of temperature sensitivity traits such as temperature minimum (T), temperature optimum (T), and maximum absolute temperature sensitivity (T) were also fitted to the square root growth (SQRT) and macromolecular rate theory (MMRT) models. The ammonia-oxidizing archaea (AOA) and bacteria (AOB) were determined by quantifying amoA, and nitrite-oxidizing bacteria (NOB) were determined by quantifying the nxrA and nxrB. Both models identified that T for PAO (34.0 °C) was significantly greater than that for PNO (26.0 °C). The T (23.4 ± 2.1 °C) and T (1.0 ± 2.0 °C) for PAO were higher than those for PNO (16.8 ± 3.2 °C and - 11.7 ± 6.7 °C). PAO was positively correlated with AOB-amoA at 20-30 °C and with AOA-amoA at 30-35 °C, while PNO was positively correlated with nxrB at 5-30 °C. Additionally, NO and NO were positively correlated with the (AOA + AOB amoA) to (nxrA + nxrB) ratio, and the concentration of NO was positively correlated with NO accumulation. These results highlight that elevated temperatures resulted in the uncoupling of NH oxidation and NO oxidation, leading to NO accumulation, which could stimulate NO emissions.

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Source
http://dx.doi.org/10.1016/j.scitotenv.2020.139391DOI Listing

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