Abstract
The effects of elevated atmospheric SO 2-4 deposition on S cycling in forest soils were assessed in an irrigation experiment using stable S isotopes. Over a period of 20 months, core lysimeters of five acidic forest soils from Southern Germany with different parent material and pedogenesis were irrigated with solutions chemically similar to canopy throughfall. Sulfate deposition in three experimental variants corresponded to 23, 42 and 87 kg S ha-1 yr -1. The SO 2-4 used for irrigation had a δ 34S ratio of +28.0‰ CDT (Cañon Diablo Troilite standard), differing by more than +25‰ from natural and anthropogenic S in Southern Germany.
A combination of chemical and isotopic analyses of soil and seepage water samples was used to elucidate the fluxes and transformations of simulated wet SO 2-4 deposition in each soil core. Retention of experimentally deposited S ranged from 57 ± 5% in coarse-grained soils low in sesquioxides and clay, to 80 ± 8% in loamy soils with high sesquioxide content. The sesquioxide content proved to be the major factor governing S retention. The ratio of S retained as inorganic SO 2-4 (mainly by adsorption) to that incorporated into organic compounds (presumably by microbial synthesis) ranged from 2 to 4. For the organic S pool, the amount of S retained as C-bonded S exceeded by far that immobilized as ester sulfate in four of the five soils.
Application of 34S-enriched SO 2-4 appears to be a suitable experimental tool to assess fluxes and transformations of deposited S in forest soils, if aerobic conditions are maintained. In contrast to radioactive S tracers, the concept should be applicable not only in laboratory and lysimeter experiments, but also in long term studies of whole forest ecosystems (e.g., experimental watersheds).
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Prietzel, J., Mayer, B., Krouse, H.R., Rehfuess, K.E., Fritz, P. (1995). Transformation of Simulated Wet Sulfate Deposition in Forest Soils Assessed by a Core Experiment Using Stable Sulfur Isotopes. In: Černý, J., Novák, M., Pačes, T., Wieder, R.K. (eds) Biogeochemical Monitoring in Small Catchments. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0261-2_14
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DOI: https://doi.org/10.1007/978-94-011-0261-2_14
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