The use of radiocarbon to constrain current and future soil organic matter turnover and transport in a temperate forest
| Autor: | Bernhard Ahrens, Marcel R. Hoosbeek, Markus Reichstein, Bart Kruijt, Pavel Kabat, Christian Beer, Altug Ekici, Marion Schrumpf, Maarten C. Braakhekke |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences vertical-distribution Eddy covariance Soil Science Soil science c-14 data Aquatic Science 01 natural sciences age calibration Earth System Science law.invention storage global vegetation models law eddy covariance Radiocarbon dating Subsoil 0105 earth and related environmental sciences Water Science and Technology Total organic carbon Topsoil WIMEK Ecology Soil organic matter Paleontology Temperate forest Forestry 04 agricultural and veterinary sciences Soil carbon 15. Life on land residence times Climate Resilience 13. Climate action Klimaatbestendigheid climate-change 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science co2 Leerstoelgroep Aardsysteemkunde terrestrial carbon-cycle |
| Zdroj: | Journal of Geophysical Research: Biogeosciences Journal of Geophysical Research: Biogeosciences 119 (2014) 3 Journal of Geophysical Research: Biogeosciences, 119(3), 372-391 |
| ISSN: | 2169-8953 |
| DOI: | 10.1002/2013jg002420 |
| Popis: | We investigated the merits of radiocarbon measurements for estimating soil organic matter (SOM) turnover and vertical transport for a temperate deciduous forest in Germany. Eleven parameters, defining decomposition and transport in the soil carbon model SOMPROF, were estimated using a Bayesian approach based on organic carbon measurements and radiocarbon concentration of SOM and heterotrophic respiration. The addition of radiocarbon data had strong effects on the parameters, most importantly a reduction of the decomposition and production rate of the slowest SOM pool by an order of magnitude, and a similar reduction in advective SOM transport. The modified parameters further led to changes in the partitioning of SOM over the different model pools. The calibration results were subsequently used to perform transient soil carbon projections for the period 1901-2100. These simulations were run with parameter sets from calibrations both with and without radiocarbon. The results show an increase over time of topsoil carbon and a decrease in the subsoil, adding to a net gain overall. Near the end of the 21st century, total carbon stocks stabilize and -- for the radiocarbon-constrained model -- start to decrease. However, the changes are small compared to the total stocks. The model results for the calibrations with and without radiocarbon are in general quite similar, but the latter shows notably higher heterotrophic respiration fluxes. Constraining the model with radiocarbon yielded only a small reduction of uncertainty for the total carbon stocks, while for the individual depth compartments, the uncertainty was increased. |
| Databáze: | OpenAIRE |
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