Soil CO2 emission in the boreal zone of Central Siberia: raised bog and lichen pine forest ecosystems

The current climate changes exert influence on these ecosystems by changing water supply, temperature regime, plant growing activity and others. Nowadays studies predicted the important role of the northern bogs and peatlands as an additional source of atmospheric CO₂. The research area was located in the Krasnoyarsk region, Russia (60° 48’ N, 89° 22’ E) close to the International research station – ZOTTO (http://www.zottoproject.org).  In our study we estimated how microrelief and microclimatic conditions can control the CO₂ emission from the bog and forested areas. We compared also the waterlogged bog conditions and forest ecosystem to find out the main drivers of soil emission dynamics during the summer season. The rate of CO₂ emission varies widely within the bog area depending on the microrelief of the area: hollow site – 0.74 ±0.03, ridge site – 1.69 ±0.08 kg CO₂ m^-2. Comparative analysis with the forest area showed that the upland parts of the bog area are not inferior to the forest area in terms of the CO² emission rate. Moisture conditions determined the CO₂ efflux for the hollow site (r=0.49, p<0.05) and forested area (r=0.39, p<0.05). The temperature impact is observed for all sites and it is significant throughout the season. Thus, within a single bog area micrometeorological characteristics of the underline surface during the season significantly control the CO₂ emission rates.

 

The research was funded by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, project number 20-44-243003.