Weathering rates of base cations are crucial in critical load calculations and assessments of sustainable forestry. The weathering rate on a single site with detailed geological data can be modelled using the PROFILE model. For environmental assessments on a regional scale, the weathering rates for sites are scaled into regional maps. The step from sites to regional level requires focus on the spatial variation of weathering rates. In this paper, a method is presented by which weathering rates are calculated for 25589 Swedish sites with total elemental analysis for the soil. Based on a part of the results, a methodology for creating area covering maps by geostatistical analysis and kriging is described. A normative reconstruction model was used to transform total elemental analysis to mineralogy. Information from the Swedish Forest Inventory database and other databases were used to derive texture and other important information for the sites, e.g. climate, deposition and vegetation data. The calculated weathering rates show a regional pattern that indicates possibilities for interpolation of data in large parts of Sweden. Geostatistical analysis of an area in southern Sweden shows different properties for different base cations. Kriging was performed for potassium to demonstrate the method. It was concluded that different base cations and different regions have to be analysed separately, in order to optimise the kriging method.
|Number of pages||11|
|Journal||Water, Air, and Soil Pollution: Focus|
|Publication status||Published - 2004|
Bibliographical noteFunding Information:
This study was financed by ASTA (International and National Abatement Strategies for Transboundary Air Pollution) and SUFOR (Sustainable Forestry in Southern Sweden), two research programs in Sweden. Part of the dataset used in this publication is based on the Swedish National Survey of Forest Soils and Vegetation, performed by the Department of Forest Soils, SLU. Other data sources were SGU (Swedish Geological Survey), IVL Swedish Environmental Research Institute, SMHI (Swedish Meteorological and Hydrological Institute) and Terra Mining. The authors are solely responsible for the interpretation of these data.
- Base cations