Details

Autor(en) / Beteiligte

• van Grinsven, Hans
• Groenenberg, Bert-Jan
• van Heerden, Kees
• Kros, Hans
• Mohren, Frits
• van der Salm, Carolien
• Steingröver, Evelien
• Tiktak, Aaldrik
• van de Veen, Jan-Renger

Titel

Effects of acid deposition on forest ecosystems in the Netherlands: Analysis of the Speuld Douglas fir site

Ist Teil von

• Studies in Environmental Science, 1995, Vol.64, p.245-260

Erscheinungsjahr

1995

Link zum Volltext

Beschreibungen/Notizen

• Large efforts have been dedicated to investigate effects of acid atmospheric deposition on trees and soil at the forest stand level. For this purpose intensive monitoring programs and integrated simulation models were developed. This paper describes the application of the models NuCSAM, SoilVeg and ForGro to the Speuld site, a Douglas fir stand on a podzolic soil. The site was monitored between 1987 and 1992. Atmospheric inputs and element outputs at Speuld are fairly representative for Dutch forests. The models were parameterized and calibrated for this site. Simulated soil water contents, soil solution chemistry, foliage biomass and nutrient status and stem growth between 1987 and 1992 were comparable with observations. The generality of the SoilVeg and ForGro model was further tested by an approximate simulation of a site irrigation and fertigation experiment at a nearby Douglas fir site between 1987 and 1991. The direction and magnitude of simulated effects of irrigation and fertigation on stem growth, litter fall and needle nutrient status were generally right, but the observed enhanced N-mineralization could not be simulated. Simulations of site response to the Dutch target deposition scenario between 1994 and 2050 showed large differences between the three models, particularly for nitrogen cycling and foliage nutrient status. Nonetheless all models indicate a fast response of soil solution chemistry to changing deposition. Both SoilVeg and ForGro indicate that direct effects of air pollution and effects of soil pH and Al are subsidiary to effects of drought and nitrogen. Our understanding of effects of acid atmospheric deposition on forests, based on lab trials, relatively short site monitoring studies and integrated simulation models, is still inadequate to quantitatively predict the long-term impact of acid deposition on forests on a nationwide scale.