Influence of disturbance on carbon exchange in a permafrost collapse and adjacent burned forest

We measured CO₂ and CH₄ exchange from the center of a Sphagnum‐dominated permafrost collapse, through an aquatic moat, and into a recently burned black spruce forest on the Tanana River floodplain in interior Alaska. In the anomalously dry growing season of 2004, both the collapse and the surrounding burned area were net sinks for CO₂, with a mean daytime net ecosystem exchange of −1.4 μmol CO₂ m⁻² s⁻¹, while the moat was a CH₄ source with a mean flux of 0.013 μmol CH₄ m⁻² s⁻¹. Regression analyses identified temperature as the dominant factor affecting intragrowing season variation in CO₂ exchange and soil moisture as the primary control influencing CH₄ emissions. CH₄ emissions during the wettest portion of the growing season were four times higher than during the driest periods. If temperatures continue to warm, peatland vegetation will likely expand with permafrost degradation, resulting in greater carbon accumulation and methane emissions for the landscape as a whole.