Modelling long-term blanket peatland development in eastern Scotland
| Autor: | Gert Verstraeten, Ward Swinnen, Nils Broothaerts |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010506 paleontology
geography geography.geographical_feature_category Peat 010504 meteorology & atmospheric sciences lcsh:QE1-996.5 lcsh:Life Climate change Woodland Land cover 01 natural sciences lcsh:Geology lcsh:QH501-531 lcsh:QH540-549.5 Environmental science Ecosystem lcsh:Ecology Physical geography Transect Bog Ecology Evolution Behavior and Systematics Holocene 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Biogeosciences, Vol 16, Pp 3977-3996 (2019) |
| ISSN: | 1726-4189 |
| Popis: | Blanket peatlands constitute a rare ecosystem on a global scale, but blanket peatland is the most important peatland type on the British Isles. Most long-term peatland development models have focussed on peat bogs and high-latitude regions. Here, we present a process-based 2-D hillslope model to simulate long-term blanket peatland development along complex hillslope topographies. To calibrate the model, the peatland architecture was assessed along 56 hillslope transects in the headwaters of the river Dee (633 km2) in eastern Scotland, resulting in a dataset of 866 soil profile descriptions. The application of the calibrated model using local pollen-based land cover and regional climate reconstructions (mean annual temperature and mean monthly precipitation) over the last 12 000 years shows that the Early Holocene peatland development was largely driven by a temperature increase. An increase in woodland cover only has a slight positive effect on the peat growth potential contradicting the hypothesis that blanket peatland developed as a response to deforestation. Both the hillslope measurements and the model simulations demonstrate that the blanket peatland cover in the study area is highly variable both in extent and peat thickness stressing the need for spatially distributed peatland modelling. At the landscape scale, blanket peatlands were an important atmospheric carbon sink during the period 9.5–6 kyr BP. However, during the last 6000 years, the blanket peatlands were in a state of dynamic equilibrium with minor changes in the carbon balance. |
| Databáze: | OpenAIRE |
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