| Autor: |
Werger, M. J. A., Heil, Gerrit W., Muys, Bart, Hansen, Karin, Kros, H., Mol, J., Groenenberg, B. J., Reinds, G. J., Heil, G. W., Van Deursen, W., De Vries, W. |
| Zdroj: |
Environmental Effects of Afforestation in North-Western Europe; 2007, p175-202, 28p |
| Abstrakt: |
Existing complex mechanistic models require too many input data, which are generally unavailable for application at a regional scale. For the development of a simplified soil model, however, we used existing complex models to start with. This soil model includes all relevant processes in order to simulate the temporal trajectory of carbon (C) sequestrations, nitrate leaching and water recharge. The soil model was derived from the existing models NUCSAM, SMART2 and SMB. For the water balance the existing model WATBAL was used. The principal question was whether the derived simplified soil model is acceptable for use within the AFFOREST project. To test this, the soil model was applied to two afforested oak chronosequences and three spruce chronosequences in Sweden, Denmark and the Netherlands. Validation of the soil and water model was performed by: • applying the model to the AFFOREST chronosequences and comparing the output on: (i) C sequestration in the soil, (ii) water recharge and (iii) nitrate concentration and nitrate leaching with (a) results from the detailed soil model NUCSAM and (b) measured values in chronosequences • testing the plausibility of the model behaviour through the evaluation of scenarios on nitrogen (N) deposition levels and temperature for various combinations of soil type and tree species. Carbon sequestration in the soil is modelled satisfactory but has a tendency to be underestimated. Modelled water recharge fluxes and nitrate leaching fluxes are also in accordance with experimental results reported in literature. In general, we conclude that the soil and water part of the metamodel is an acceptable and even a necessarily alternative for a more complex process oriented model and that it fulfils the necessary requirements for use within the AFFOREST project. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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