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: The C/N ratios of the organic layer of the NFSI II were the lowest under deciduous tree species, whereas coniferous tree species are characterized by high C/N ratios and a higher variability (Fig.3). We found C/N ratios under tree species that ranged between 23.4 ± 0.4 (misc. deciduous tree species) and 27.1 ± 0.2 (spruce). There were significant differences among tree species as well as an increase in C/N ratios with resampling (anova; P < 0.001). Despite the different response to tree species and inventory, indicated by a significant interaction (anova; P < 0.001), an increase in C/N ratios of the organic layer under all tree species was evident between inventories (Tukey; P < 0.05). The mean organic layer C concentrations of the NFSI II ranged between 240.4 ± 4.3 g kg−1 (pine) and 345.6 ± 7.6 g kg−1 (misc. deciduous tree species). In contrast to the C/N ratios, the variability of C concentrations among tree species was less pronounced for the NFSI I. Nevertheless, there were no differences between inventories, whereas the difference among the tree species was significant (anova; P < 0.001). This was evident by higher C concentrations under deciduous tree species compared to stands with coniferous tree species. Due to an interaction between the class variables (anova; P < 0.001), there was an increase in C concentrations under misc. deciduous forest and spruce (Tukey; P < 0.05), whereas under pine the C concentrations declined (Tukey; P < 0.05).
Affiliation: Johann Heinrich von Thünen Institute, Institute of Forest Ecosystems, Alfred-Möller-Straße 1, 16225, Eberswalde, Germany.