Different soil moisture control of net methane oxidation and production in organic upland and wet forest soils of the Pacific coastal rainforest in Canada
Christiansen, Jesper Riis | Levy-Booth, David | Prescott, Cindy E. | Grayston, Sue J.
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 (CH₄) exchange rates and the abundance of methanotrophs (CH₄ oxidation) and methanogens (CH₄ production) in upland and water-saturated wet soils were investigated. CH₄ 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 CH₄ exchange rates. Also, CH₄ production was induced in the upland soils, indicating the presence of methanogens. The optimum soil moisture content for CH₄ oxidation was highest in upland soils and the wet soils sustained higher CH₄ oxidation rates over a broader range of soil moisture. These results underline the importance of the soil hydrological controls of CH₄ oxidation in contrasting soils and forest types, which deserves further attention in field-based studies.
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