1 Geography, Department of Geosciences and Natural Resource Management, Faculty of Science, Københavns Universitet2 Geology, Department of Geosciences and Natural Resource Management, Faculty of Science, Københavns Universitet3 Institut for Planlægning4 Roskilde University5 Institut for Agroøkologi - Jordfysik og Hydropedologi6 Geography, Department of Geosciences and Natural Resource Management, Faculty of Science, Københavns Universitet7 Roskilde University
a case study from Denmark
The purpose of this paper is to investigate the geographical distribution of pH values in Danish soils of different ages representing the main Saalian and Weichselian ice advances. The investigation is based on soil sampling from top- and subsoils in soil profiles located in a nationwide 7-km grid. The data have been analysed using statistical spatial analysis methods, and a model has been erected demonstrating areas of homogeneous low, high, or inhomogeneous pH values relative to deposits from different ice advances and regional variations in land use. The investigation shows that the major part of Jutland is characterized by low pH values in the topsoils and subsoils compared to the islands east of the peninsula. This corresponds with the maximum extension of the Weichselian Young Baltic Ice Cap. A Hot Spot analysis carried out on regional and local scales shows that most of the Danish islands form a homogeneous area of high pH values except Northeast Zealand. And in Jutland a huge area east and north of the maximum extension of the Young Baltic Ice Cap formed a homogeneous area of low pH values. Exceptions are the areas around Mors in the western part of the Limfjord and in the eastern part of Himmerland and on Djursland.