Carbon balance of a peatland ecosystem under the changing environment

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We compared evapotranspiration and carbon balance between areas dominated by sphagnum species and vascular plats,"sasa" using flux monitoring data. Evapotranspiration during the snow-free season was higher at the sphagnum area than the sasa area, which does not support a hypothesis that the invasion of sasa plants with root systems dries the Sarobetsu Mire. The carbon balance during the snow-free season shows that both the ecosystems functioned as net CO_2 sinks to the atmosphere. In 2010, which had a very hot summer, net CO_2 uptake increased in the sphagnum area, whereas it decreased in the sasa area mainly because of increased ecosystem respiration due to high temperature.