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Measured and modelled retention of inorganic sulfur in soils and subsoils (Harz Mountains, Germany)
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 86919
Author(s) Lukewille, A; Malessa, V; Alewell, C
Author(s) at UniBasel Alewell, Christine
Year 1995
Title Measured and modelled retention of inorganic sulfur in soils and subsoils (Harz Mountains, Germany)
Journal Water, air and soil pollution
Volume 85
Number 2
Pages / Article-Number 683-688
Keywords sulfur sorption, long-term acidification, sulfate adsorption, hydroxosulfate minerals, modeling, future scenarios
Abstract

Atmospheric deposition has resulted in an accumulation of inorganic sulfur (S) in many forest soils. At Sosemulde (Hart Mountains) samples from 5-240 cm depth were analysed. Most sulfate (SO4) is accumulated at about 30-60 cm depth: 8.5-9.5 mmol(c) kg(-1). Large amounts can also be retained in > 100 cm. To assess changes in SO4 dynamics in time,adsorption isotherms have been included in several process-oriented models, e.g., in MAGIC. The Lange Bramke (LB) Model is the first model used on the catchment scale containing solubility products for the hydroxosulfate minerals jurbanite and alunite. By reconstructing the long-term acidification history (140 years) both models were successfully calibrated to a 14-year deposition, soil and streamwater data set at Lange Bramke catchment (Harz Mountains). According to MAGIC the present accumulation of SO4 in 0 - 80 cm is 8.7 mmol(c) kg(-1), while according to the LB-Model 10.2 mmol(c) kg(-1) are stored as jurbanite. Both models predicted 4.5 mmol(c) kg(c) SO4 in the subsoil layer, retained as alunite in the LB Model. These values correspond to the amounts measured in soil and subsoil samples at Sosemulde, respectively. However, for future scenarios with decreasing S inputs the models show different developments in SO4 concentrations. Changes in MAGIC are gradual whereas the LB model predicts stepwise decreasing SO4 values as soon as previously stored hydroxosulfates are fully dissolved. Such concentration ''jumps'' have not been observed.

Publisher Kluwer
ISSN/ISBN 0049-6979
edoc-URL http://edoc.unibas.ch/dok/A5251190
Full Text on edoc No
Digital Object Identifier DOI 10.1007/BF00476908
ISI-Number WOS:A1995UB05300066
Document type (ISI) ArticleProceedings Paper
 
   

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