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A large part of the spatial variation of stream water chemistry can be related to inputs from headwater streams. In order to understand and analyse the dominant processes taking place in small and heterogeneous catchments, accu- rate data with high spatial and temporal resolution is nec- essary. In most cases, the quality and resolution of available map data are considered too poor to be used in environmental assessments and modelling of headwater stream chemistry. In this study 18 forested catchments (1-4 km 2 ) were selected within a 120◊50 km region in the county of V¨ armland in western Sweden. The aim was to test if topographic and veg- etation variables derived from official datasets were corre- lated to stream water chemistry, primarily the concentration of dissolved organic carbon (DOC), but also Al, Fe and Si content. GIS was used to analyse the elevation characteris- tics, generate topographic indices, and calculate the percent- age of wetlands and a number of vegetation classes. The re- sults clearly show that topography has a major influence on stream water chemistry. There were strong correlations be- tween mean slope and percentage wetland, percentage wet- land and DOC, mean slope and DOC, and a very strong cor- relation between mean topographic wetness index (TWI) and DOC. The conclusion was that official topographic data, de- spite uncertain or of low quality and resolution, could be use- ful in the prediction of headwater DOC-concentration in bo- real forested catchments.

Using official map data on topography, wetlands and vegetation cover for prediction of stream water chemistry in boreal headwater catchments