Sulphate adsorption and acidification of Calluna heathland and Scots pine forest podzol soils in north-east Scotland |
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| Institution: | 1. Department of Soil and Environment, Swedish University of Agricultural Sciences (SLU), P.O. Box 7014, SE-750 07 Uppsala, Sweden;2. Kantarellvägen 6, SE-756 45 Uppsala, Sweden;3. Department of Ecology, Swedish University of Agricultural Sciences (SLU), P.O. Box 7044, SE-750 07 Uppsala, Sweden;4. Department of Economics, Unit of Applied Statistics and Mathematics, Swedish University of Agricultural Sciences (SLU), P.O. Box 7013, SE-750 07 Uppsala, Sweden;5. Department of Crop Production Ecology, SLU, P.O. Box 7043, SE-750 07 Uppsala, Sweden;6. World Agroforestry Centre, P.O. Box 30677-00100, Nairobi, Kenya;1. Department of Biological Sciences, Marshall University, Huntington, WV 25705, United States;2. U.S.D.A. Forest Service, 180 Canfield Street, Morgantown, WV 26506, United States;1. Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Dyrlægevej 100, 1870 Frederiksberg C, Denmark;2. Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark;3. College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot 010018, PR China;1. Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, 3900 NCTR Rd, Jefferson, AR, 72079, USA;2. Division of Biochemical Toxicology, National Center for Toxicological Research, US Food and Drug Administration, 3900 NCTR Rd, Jefferson, AR, 72079, USA;1. Institute for Agricultural and Fisheries Research (ILVO), Plant Sciences Unit, Crop Husbandry and Environment, Burg. Van Gansberghelaan 109, 9820 Merelbeke, Belgium;2. Katholieke Universiteit Leuven, Department of Earth and Environmental Sciences, Division of Soil and Water Management, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium |
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| Abstract: | Three sites in north-east Scotland were selected to compare soil characteristics of acidification-sensitive sites under Calluna vulgaris heathland and afforestation. At each site, fences separate Calluna heathland from Scots pine plantation on podzol profiles evolved from granitic parent material on gentle slopes in the altitude range 200–500 m. In total, 30 soil pits were dug, with five for each land use-type at each of the three sites. Samples of each horizon were analysed for pH, sulphate adsorption/desorption characteristics, cation exchange properties, carbon and nitrogen contents, bulk density and texture. As expected, acidification to depth had occurred in the forest sites. However, although the forest soils at depth showed less capacity for sulphate adsorption, as might be expected from increased atmospheric aerosol and pollutant trapping and greater water interception loss under trees, they did not contain more PO3−4-extractable sulphate. This may reflect the combined effects of soil pH differences and changes in concentrations and composition of soluble organic matter upon sulphate adsorption, although interpretation is also complicated by textural differences between forest and heathland soils. |
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