Effects of nitrogen and sulphate addition on methane oxidation in the marsh soil of a typical subtropical estuary (Min River) in China

Methane (CH 4 ) oxidation plays an important role in regulating the atmospheric CH 4 balance. Although nitrogen (N) enhancement and sulphate ( ) deposition are major environmental problems facing the Min River estuary in subtropical China, the interactive effects of N and on CH 4 oxidation remain po...

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Bibliographic Details
Published in:Chemistry and ecology 2018-08, Vol.34 (7), p.610-623
Main Authors: Hu, Minjie, Wilson, Benjamin J., Sun, Zhigao, Huang, Jiafang, Tong, Chuan
Format: Article
Language:English
Subjects:
Ammonium
Ammonium compounds
Brackishwater environment
Deposition
Estuaries
Estuarine dynamics
Estuarine environments
Incubation period
Inhibition
marsh soil
Marshes
Methane
Methane oxidation
Min River estuary
Nitrogen
nitrogen enhancement
Oxidation
Rivers
Seasonal variation
Seasonal variations
Soil
Soil moisture
Soil temperature
Sulfates
sulphate deposition
Wetlands
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Summary:Methane (CH 4 ) oxidation plays an important role in regulating the atmospheric CH 4 balance. Although nitrogen (N) enhancement and sulphate ( ) deposition are major environmental problems facing the Min River estuary in subtropical China, the interactive effects of N and on CH 4 oxidation remain poorly understood. We conducted an incubation experiment to investigate the effects of N and additions on CH 4 oxidation in marsh soils. CH 4 oxidation exhibited distinct seasonal variations, which correlated with changes in temperature and soil moisture; in addition, CH 4 oxidation rates were enhanced by the addition of nitrate ( ), but were slightly inhibited by the addition of ammonium ( ) and . The combined effects of N and on CH 4 oxidation were controlled primarily by the form of N, which may imply that inhibition of CH 4 oxidation with addition may be counteracted by N addition, especially in estuarine marsh soils with low N and high concentrations. We propose that, although was more effective in stimulating CH 4 oxidation and the inhibition caused by and was minor, CH 4 oxidation may be inhibited because was dominant and accompanied by strong deposition in the Min River estuary. As such, future CH 4 emissions from estuarine wetlands may increase as a result of higher inputs of and .
ISSN:0275-7540
1029-0370
DOI:10.1080/02757540.2018.1464153