Fluxes of soil carbon dioxide, nitrous oxide and firedamp in broadleaved/Korean pine forest

Abstract

To understand influence of litters on the emission/absorption of CO₂, N₂O and CH₄ in broadleaved/Korean pine forest in Changbai Mountain, fluxes of soil CO₂, N₂O and CH₄ were measured by closed static chamber technique, from Sept 3, 2002 to Oct 30, 2003 in two types of soil ecosystems, of which one was covered with litters on the surface soil, and the other had no litters. The results showed that litters had significant influences on CO₂, N₂O and CH₄ fluxes (p<0.05). Their diurnal change patterns of plot with litters and litter-free plot were similar, and they all showed emission/absorption peak at 18:00. The diurnal change fluxes of CO₂ and N₂O of plot with litters were significantly higher than those of the litter-free plot, while the diurnal flux of CH₄ of plot with litters was lower than that of litter-free plot. The fluxes of CO₂, N₂O, and CH₄ showed the similar seasonal patternsfor both plots. The fluxes of CO₂, CH₄ showed their peak fluxes in June, but the fluxes of N₂O showed its peak emissions in August. The annual fluxes of CO₂ and N₂O of plot with litters were significantly higher than those of the litter-free plot, while the annual flux of CH₄ of plot with litters was lower than that of litter-free plot.

Keywords

Flux / CO₂, N₂O and CH₄ / Seasonal variation / Diurnal variation / S718.5 / A