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Different soil moisture control of net methane oxidation and production in organic upland and wet forest soils of the Pacific coastal rainforest in Canada

2017; NRC Research Press; Volume: 47; Issue: 5 Linguagem: Inglês

10.1139/cjfr-2016-0390

1208-6037

Jesper Riis Christiansen, David J. Levy‐Booth, Cindy E. Prescott, S. J. Grayston,

Methane Hydrates and Related Phenomena

In a changing climate, understanding how soil hydrology impacts greenhouse gas dynamics will be important for the future management of the soils in the forests on the Canadian Pacific west coast. In a laboratory study, the impact of soil hydrology on potential net methane (CH 4 ) exchange rates and the abundance of methanotrophs (CH 4 oxidation) and methanogens (CH 4 production) in upland and water-saturated wet soils were investigated. CH 4 oxidation and production rates were highest in the wet soils, which corresponded to higher numbers of methanotrophs and methanogens, indicating a link between the microbial abundance and CH 4 exchange rates. Also, CH 4 production was induced in the upland soils, indicating the presence of methanogens. The optimum soil moisture content for CH 4 oxidation was highest in upland soils and the wet soils sustained higher CH 4 oxidation rates over a broader range of soil moisture. These results underline the importance of the soil hydrological controls of CH 4 oxidation in contrasting soils and forest types, which deserves further attention in field-based studies.