Talk to be held at the workshop on image analysis and spatial statistics in forestry on November 2, 1999 at KVL, Frederiksberg, Denmark
Monica Magnusson (monicamagnusson@wildmail.com)
Dept. Applied environmental science, University of Gothenburg, Sweden
The effects of acid rain gives consequences for soil-, subsoil- and surface water in the future. Even if the pollution comes down to a acceptable level there will be a acidification memory in the soil. In Sweden the southwest part of the country will have the most problem. There is where the acid deposition have been largest and where the buffer capacity of the ground is weakest.
In a watershed there are several landscape elements that affects the water flowing through. How and of which extent is not quite known. That also makes it more difficult to read the results from the attempt of forest liming.
To use Geographic Information System, GIS, for an analyses in relation to the measurement of water quality is a possibility to increase the knowledge.
In Sweden the National Board of Forest are researching on small catchment areas of forest that was limed about ten years ago. Some of those areas has been used in this work. With consideration to some chosen parameters a computer-base of thematic maps has been built. The selection of parameters has been governed by the need and availability of useful data. The map-layers purpose are to be useful for analyses of forest-liming. The work has been including collecting data, digitizing and finally the construction of maps in the raster-program Idrisi.
The work has so far given eight separate layers useful for analyses of how catchment characteristics can effect the result of forest-liming: