Mikko Moilanen, Jyrki Hytönen & Mirva Leppälä
Proceedings of the 14th International Peat Congress
co2-emission, drainage, fertilization, greenhouse-gas, soil-respiration, wood-ash
Theme X. Peatland carbon budgets and greenhouse gas (GHG) fluxes
Forested peatlands contain large pools of terrestrial carbon. Besides drainage also forest management, e.g., fertilization, can affect these pools. We studied the effect of wood ash application (5 or 15 t ha-1) on the heterotrophic soil respiration (CO2 emission from the decomposition of peat) on a pine-dominated drained mire in central Finland. The ash was spread 13 years before the measurements. Wood ash roughly doubled the CO2 emission from the peat soil. Ash treatments increased stand growth substantially: the growing stock on ash plots accumulated carbon 11-12-fold compared to control. In conclusion, the ash induced increase in biomass production considerably decreased carbon emissions from the study site.