Organic carbon stocks and sequestration rates of forest soils in Germany.
Bottom Line: We identified the organic layer C pool as stable although C was significantly sequestered under coniferous forest at lowland sites.The applied uncertainty analyses in this study link the variability of strata with measurement errors.In accordance to other studies for Central Europe, the results showed that the applied method enabled a reliable nationwide quantification of the soil C pool development for a certain period.
Affiliation: Johann Heinrich von Thünen Institute, Institute of Forest Ecosystems, Alfred-Möller-Straße 1, 16225, Eberswalde, Germany.Show MeSH
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Mentions: Carbon pool changes in forested mineral soils are considered to appear in the top soil; hence the depth distribution of volume-based C stocks was investigated (Fig.4). The highest C pool could be found in the uppermost depth increments ranging from 30.6 ± 2.3 kg m−3 (NSG 15) to 54.1 ± 2.1 kg m−3 (NSG 16). The C stocks decreased with increasing depth. The C stored in the lowest increment ranged from 9.1 ± 0.6 (NSG 6) to 30.2 ± 2.1 kg m−3 (NSG 16). The C pool of all depth increments has changed significantly with resampling (anova; P < 0.001). We also detected in all depth increments different C stocks among soil groups (anova, P < 0.001) as well as an interaction between class variables (anova, P < 0.01). This shows that the magnitude of C pool changes in each increment is affected by soil groups indicating that the considered stratification approach seems to be a suitable factor for explaining a significant part of the variance. Taking the individual soil groups into account, we observed in the upper depth increments of almost all soil groups a significant increase in C with resampling. Differences were less abundant with increasing depth. Nevertheless, sandy sites of the lowland were the most affected soils in respect to positive C pool changes in all depth increments. A C change in the 5–10 cm increment was hardly abundant apart from the sandy soils of the lowland. Outside of sandy soils, acidic soils of the mountains and hilly areas as well as alpine soils showed an increase in C stocks in the lowest increment.
Affiliation: Johann Heinrich von Thünen Institute, Institute of Forest Ecosystems, Alfred-Möller-Straße 1, 16225, Eberswalde, Germany.