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  • 1
    In: Global Change Biology, August 2014, Vol.20(8), pp.2644-2662
    Description: The ational orest oil nventory () provides the reenhouse as eporting in ermany with a quantitative assessment of organic carbon () stocks and changes in forest soils. Carbon stocks of the organic layer and the mineral topsoil (30 cm) were estimated on the basis of ca. 1.800 plots sampled from 1987 to 1992 and resampled from 2006 to 2008 on a nationwide grid of 8 × 8 km. Organic layer stock estimates were attributed to surveyed forest stands and land cover data. Mineral soil stock estimates were linked with the distribution of dominant soil types according to the oil ap of ermany (1 : 1 000 000) and subsequently related to the forest area. It appears that the pool of the organic layer was largely depending on tree species and parent material, whereas the pool of the mineral soil varied among soil groups. We identified the organic layer pool as stable although was significantly sequestered under coniferous forest at lowland sites. The mineral soils, however, sequestered 0.41 Mg C ha yr. Carbon pool changes were supposed to depend on stand age and forest transformation as well as an enhanced biomass input. Carbon stock changes were clearly attributed to parent material and soil groups as sandy soils sequestered higher amounts of , whereas clayey and calcareous soils showed small gains and in some cases even losses of soil . We further showed that the largest part of the overall sample variance was not explained by fine‐earth stock variances, rather by the concentrations variance. The applied uncertainty analyses in this study link the variability of strata with measurement errors. In accordance to other studies for entral urope, the results showed that the applied method enabled a reliable nationwide quantification of the soil pool development for a certain period.
    Keywords: C/N Ratio ; Carbon Sequestration ; Carbon Stocks ; Forest Stand Type ; Mineral Soil ; Nation Forest Soil Inventory ; Organic Layer ; Soil Groups ; Soil Organic Matter ; Soil Survey ; Tree Species ; Uncertainties
    ISSN: 1354-1013
    E-ISSN: 1365-2486
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  • 2
    Language: English
    In: Science of the Total Environment, 10 January 2019, Vol.647, pp.1573-1585
    Description: Forest soils represent a large carbon pool and already small changes in this pool may have an important effect on the global carbon cycle. To predict the future development of the soil organic carbon (SOC) pool, well-validated models are needed. We applied the litter and soil carbon model Yasso15 to 1838 plots of the German national forest soil inventory (NFSI) for the period between 1985 and 2014 to enables a direct comparison to the NFSI measurements. In addition, to provide data for the German Greenhouse Gas Inventory, we simulated the development of SOC with Yasso15 applying a climate projection based on the RCP8.5 scenario. The initial model-calculated SOC stocks were adjusted to the measured ones in the NFSI. On average, there were no significant differences between the simulated SOC changes (0.25 ± 0.10 Mg C ha  a ) and the NFSI data (0.39 ± 0.11 Mg C ha  a ). Comparing regional soil-unit-specific aggregates of the SOC changes, the correlation between both methods was significant (r  = 0.49) although the NFSI values had a wider range and more negative values. In the majority of forest types, representing 75% of plots, both methods produced similar estimates of the SOC balance. Opposite trends were found in mountainous coniferous forests on acidic soils. These soils had lost carbon according to the NFSI (−0.89 ± 0.30 Mg C ha  a ) whereas they had gained it according to Yasso15 (0.21 ± 0.10 Mg C ha  a ). In oligotrophic pine forests, the NFSI indicated high SOC gains (1.36 ± 0.17 Mg C ha  a ) and Yasso15 much smaller (0.29 ± 0.10 Mg C ha  a ). According to our results, German forest soils are a large carbon sink. The application of the Yasso15 model supports the results of the NFSI. The sink strength differs between forest types possibly because of differences in organic matter stabilisation.
    Keywords: Soil Carbon Changes ; Soil Organic Carbon ; Climate ; Soil Inventory ; Yasso15 ; Litter and Soil Carbon Model ; Temperate Forests ; Environmental Sciences ; Biology ; Public Health
    ISSN: 0048-9697
    E-ISSN: 1879-1026
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