Carbon pool densities and a first estimate of the total carbon pool in the Mongolian forest-steppe.

Abstract

The boreal forest biome represents one of the most important terrestrial carbon stores, which gave reason to intensive research on carbon stock densities. However, such an analysis does not yet exist for the southernmost Eurosiberian boreal forests in Inner Asia. Most of these forests are located in the Mongolian forest-steppe, which is largely dominated by Larixsibirica. We quantified the carbon stock density and total carbon pool of Mongolia's boreal forests and adjacent grasslands and draw conclusions on possible future change. Mean aboveground carbon stock density in the interior of L.sibirica forests was 66MgCha(-1) , which is in the upper range of values reported from boreal forests and probably due to the comparably long growing season. The density of soil organic carbon (SOC, 108MgCha(-1) ) and total belowground carbon density (149MgCha(-1) ) are at the lower end of the range known from boreal forests, which might be the result of higher soil temperatures and a thinner permafrost layer than in the central and northern boreal forest belt. Land use effects are especially relevant at forest edges, where mean carbon stock density was 188MgCha(-1) , compared with 215MgCha(-1) in the forest interior. Carbon stock density in grasslands was 144MgCha(-1) . Analysis of satellite imagery of the highly fragmented forest area in the forest-steppe zone showed that Mongolia's total boreal forest area is currently 73818km(2) , and 22% of this area refers to forest edges (defined as the first 30m from the edge). The total forest carbon pool of Mongolia was estimated at ~1.5-1.7Pg C, a value which is likely to decrease in future with increasing deforestation and fire frequency, and global warming.