Inorganic nutrient inputs from mineral weathering in two Scottish upland ecosystems |
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| Institution: | 1. Laboratoire de Géologie de l''ENS, PSL Research University, UMR8538 du CNRS, 24 rue Lhomond, 75231 Paris CEDEX 05, France;2. Universidad Pùblica de Navarra, Departamento Ciencias del Medio Natural, ETSIA, Campus Arrosadia, 31006 Pamplona, Spain;3. UMR 7285 IC2MP-HydrASA, UMR 7285, Université de Poitiers, France;4. AgroParisTech, UMR EGC-ECOSYS, AgroParisTech-INRA, 78850 Thiverval-Grignon, France;1. Department of Soil Science of Temperate Ecosystems, Department of Agricultural Soil Science, University of Göttingen, Büsgenweg 2, 37077 Göttingen, Germany;2. Institute of Soil Science and Land Evaluation (310), University of Hohenheim, Schloss Hohenheim 1, 70599 Stuttgart, Germany;3. Institute of Environmental Sciences, Kazan Federal University, Kazan, Russia |
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| Abstract: | Uptake of K, Ca, Mg and Na by vegetation in two upland ecosystems, one situated in andesitic parent material and the other on mica-schists, has been studied in relation to the mineralogy of the soils and the rates of weathering of base cations. Rates of weathering were calculated by two methods: (1) long-term rates were calculated from losses of the elements in soil horizons using Zr as an internal index; (2) current rates were calculated from input-output budgets using rain-water and stream chemistry over a 3 a period. Vegetation uptake can be related in a general way to mineralogy and weathering trends. Most of the K released from the soil appears to be taken up by the vegetation and the content of K in grass-dominated plant communities is related mainly to the availability of K from the weathering of mica. High levels of Ca in the streams indicate an overabundance of Ca which is being released mainly by weathering of plagioclase feldspar. Amounts of Mg in the vegetation are related to variations in the content of chlorite which is easily weathered at both sites. |
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