Carbon pool densities and a first estimate of the total carbon pool in the Mongolian forest‐steppe |
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| Authors: | Choimaa Dulamsuren Michael Klinge Jan Degener Mookhor Khishigjargal Tselmeg Chenlemuge Banzragch Bat‐Enerel Yolk Yeruult Davaadorj Saindovdon Kherlenchimeg Ganbaatar Jamsran Tsogtbaatar Christoph Leuschner Markus Hauck |
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| Affiliation: | 1. Plant Ecology, Albrecht von Haller Institute for Plant Sciences, Georg August University of G?ttingen, G?ttingen, Germany;2. Cartography, GIS and Remote Sensing, Institute of Geography, Georg August University of G?ttingen, G?ttingen, Germany;3. Agroecology, Mongolian University of Life Sciences, Ulan Bator, Mongolia;4. Botany, Institute of General and Experimental Biology, Mongolian Academy of Sciences, Ulan Bator, Mongolia;5. Geography and Geoecology, Mongolian Academy of Sciences, Ulan Bator, Mongolia;6. Functional Ecology, Institute for Biology and Environmental Sciences, Carl von Ossietzky University of Oldenburg, Oldenburg, Germany |
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| 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 Larix sibirica. 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 66 Mg C ha?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, 108 Mg C ha?1) and total belowground carbon density (149 Mg C ha?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 188 Mg C ha?1, compared with 215 Mg C ha?1 in the forest interior. Carbon stock density in grasslands was 144 Mg C ha?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 73 818 km2, and 22% of this area refers to forest edges (defined as the first 30 m from the edge). The total forest carbon pool of Mongolia was estimated at ~ 1.5?1.7 Pg C, a value which is likely to decrease in future with increasing deforestation and fire frequency, and global warming. |
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| Keywords: | allometric regression biomass function boreal forest carbon stock density forest area grassland meadow steppe remote sensing Siberian larch (Larix sibirica) |
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