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Evaluating simplifications used in regional applications of the SAFE and MAKEDEP models

Alveteg, Mattias LU ; Walse, Charlotta LU and Sverdrup, Harald LU (1998) In Ecological Modelling 107(2-3). p.265-277
Abstract
The importance of different additional simplifications used when moving from single site applications to regional applications of the SAFE and MAKEDEP models was studied. The SAFE model is a dynamic soil chemistry model, which apart from physical and chemical soil parameters also needs the historic evolution of atmospheric deposition and nutrient uptake to simulate the effects of acidic deposition on the chemical status of forest soils. The historic evolution of atmospheric deposition and nutrient uptake are reconstructed by the MAKEDEP model, using information on current deposition and nutrients status together with general deposition trends. Additional simplifica- tions are enforced by limitations in available regional data sets and the... (More)
The importance of different additional simplifications used when moving from single site applications to regional applications of the SAFE and MAKEDEP models was studied. The SAFE model is a dynamic soil chemistry model, which apart from physical and chemical soil parameters also needs the historic evolution of atmospheric deposition and nutrient uptake to simulate the effects of acidic deposition on the chemical status of forest soils. The historic evolution of atmospheric deposition and nutrient uptake are reconstructed by the MAKEDEP model, using information on current deposition and nutrients status together with general deposition trends. Additional simplifica- tions are enforced by limitations in available regional data sets and the costs involved in completing regional data sets. The simplifications studied here are the same as those used in an actual regional application to Scania, southern Sweden: (1) Use of default values for certain soil parameters such as dissolved organic carbon (DOC) and soil bulk density; (2) Use of general depth trends to extrapolate soil parameters, such as mineralogy and surface area, measured for one soil layer to the other three soil layers considered in the SAFE model application; (3) Use of a simplified version of MAKEDEP, where some of the key feedbacks, such as the effects of a growing canopy on dry deposition rates have been removed in order to limit the input data needed to run the MAKEDEP model. The models where applied to two well documented sites, Solling, Germany and Rothamsted, UK. Model results using the above simplifications and subsets thereof were compared with soil chemistry measurements and model results based on previously published single-site applications for the two sites. The study shows that the trends and the present day values of pH and base cation concentration are reproduced fairly well even when all of the simplifications are used. In order to increase the reliability of the regional applications, however, the non-simplified version of MAKEDEP should be used rather than the simplified version. Regional data sets of standing biomass and nutrient contents are therefore needed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Soil chemistry, Acidification, Dynamic modeling, Uncertainty
in
Ecological Modelling
volume
107
issue
2-3
pages
265 - 277
publisher
Elsevier
external identifiers
  • scopus:0032055633
ISSN
0304-3800
DOI
10.1016/S0304-3800(98)00003-9
language
English
LU publication?
yes
id
1e04d264-0d0c-4f92-bcf3-2d4963ef5e80 (old id 1275395)
date added to LUP
2009-01-29 16:30:34
date last changed
2017-01-01 06:53:23
@article{1e04d264-0d0c-4f92-bcf3-2d4963ef5e80,
  abstract     = {The importance of different additional simplifications used when moving from single site applications to regional applications of the SAFE and MAKEDEP models was studied. The SAFE model is a dynamic soil chemistry model, which apart from physical and chemical soil parameters also needs the historic evolution of atmospheric deposition and nutrient uptake to simulate the effects of acidic deposition on the chemical status of forest soils. The historic evolution of atmospheric deposition and nutrient uptake are reconstructed by the MAKEDEP model, using information on current deposition and nutrients status together with general deposition trends. Additional simplifica- tions are enforced by limitations in available regional data sets and the costs involved in completing regional data sets. The simplifications studied here are the same as those used in an actual regional application to Scania, southern Sweden: (1) Use of default values for certain soil parameters such as dissolved organic carbon (DOC) and soil bulk density; (2) Use of general depth trends to extrapolate soil parameters, such as mineralogy and surface area, measured for one soil layer to the other three soil layers considered in the SAFE model application; (3) Use of a simplified version of MAKEDEP, where some of the key feedbacks, such as the effects of a growing canopy on dry deposition rates have been removed in order to limit the input data needed to run the MAKEDEP model. The models where applied to two well documented sites, Solling, Germany and Rothamsted, UK. Model results using the above simplifications and subsets thereof were compared with soil chemistry measurements and model results based on previously published single-site applications for the two sites. The study shows that the trends and the present day values of pH and base cation concentration are reproduced fairly well even when all of the simplifications are used. In order to increase the reliability of the regional applications, however, the non-simplified version of MAKEDEP should be used rather than the simplified version. Regional data sets of standing biomass and nutrient contents are therefore needed.},
  author       = {Alveteg, Mattias and Walse, Charlotta and Sverdrup, Harald},
  issn         = {0304-3800},
  keyword      = {Soil chemistry,Acidification,Dynamic modeling,Uncertainty},
  language     = {eng},
  number       = {2-3},
  pages        = {265--277},
  publisher    = {Elsevier},
  series       = {Ecological Modelling},
  title        = {Evaluating simplifications used in regional applications of the SAFE and MAKEDEP models},
  url          = {http://dx.doi.org/10.1016/S0304-3800(98)00003-9},
  volume       = {107},
  year         = {1998},
}