Publication Details

Experimental soil warming effects on CO2 and CH4 flux from a low elevation spruce-fir forest soil in Maine, USA

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Rustad, Lindsey E.; Fernandez, Ivan J.

Year Published

1998

Publication

Global Change Biology

Abstract

The effect of soil warming on CO2 and CH4 flux from a spruce-fir forest soil was evaluated at the Howland Integrated Forest Study site in Maine, USA from 1993 to 1995. Elevated soil temperatures (~5 °C) were maintained during the snow-free season (May-November) in replicated 15 × 15-m plots using electric cables buried 1-2 cm below the soil surface; replicated unheated plots served as the control. CO2 evolution from the soil surface and soil air CO2 concentrations both showed clear seasonal trends and significant (P < 0.0001) positive exponential relationships with soil temperature. Soil warming caused a 25-40% increase in CO2 flux from the heated plots compared to the controls. No significant differences were observed between heated and control plot soil air CO2 concentrations which we attribute to rapid equilibration with the atmosphere in the O horizon and minimal treatment effects in the B horizon. Methand fluxes were highly variable and showed no consistent trends with treatment.

Keywords

carbon dioxide; climate change; forest soils; methane; soil respiration; soil warming

Citation

Rustad, Lindsey E.; Fernandez, Ivan J. 1998. Experimental soil warming effects on CO2 and CH4 flux from a low elevation spruce-fir forest soil in Maine, USA. Global Change Biology. 4(6): 597-605. https://doi.org/10.1046/j.1365-2486.1998.00169.x.

Last updated on: May 16, 2018