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Titolo:
INTERPRETATION OF SULFUR CYCLING IN 2 CATCHMENTS IN THE BLACK-FOREST (GERMANY) USING STABLE SULFUR AND OXYGEN-ISOTOPE DATA
Autore:
MAYER B; FEGER KH; GIESEMANN A; JAGER HJ;
Indirizzi:
RUHR UNIV BOCHUM,INST GEOL,LEHRSTUHL SEDIMENT & ISOTOPENGEOL,UNIV STR150 D-44780 BOCHUM GERMANY GSF,FORSCHUNGSZENTRUM UMWELT & GESUNDHEIT,INST HYDROL D-85758 OBERSCHLEISSHEIM GERMANY UNIV FREIBURG,INST BODENKUNDE & WALDERNAHRUNGSLEHRE FREIBURG GERMANY UNIV GIESSEN,INST PLANZENOKOL D-35392 GIESSEN GERMANY
Titolo Testata:
Biogeochemistry
fascicolo: 1, volume: 30, anno: 1995,
pagine: 31 - 58
SICI:
0168-2563(1995)30:1<31:IOSCI2>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATMOSPHERIC DEPOSITION; SULFATE; SOILS; ECOSYSTEMS; DYNAMICS; SULFIDE; STREAM; CANADA;
Keywords:
CATCHMENT; ISOTOPE FRACTIONATION; SULFUR CYCLING; STABLE ISOTOPES; DELTA-S-34; DELTA(18)OSULFATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
60
Recensione:
Indirizzi per estratti:
Citazione:
B. Mayer et al., "INTERPRETATION OF SULFUR CYCLING IN 2 CATCHMENTS IN THE BLACK-FOREST (GERMANY) USING STABLE SULFUR AND OXYGEN-ISOTOPE DATA", Biogeochemistry, 30(1), 1995, pp. 31-58

Abstract

The isotopic composition of SO42- in bulk precipitation, canopy throughfall, seepage water at three different soil depths, stream water, and groundwater was monitored in two forested catchments in the Black Forest (Germany) between November 1989 and February 1992. Isotope measurements on aqueous sulfate were complemented by delta(34)S-analyses on SO2 in the air, total sulfur and inorganic sulfate in the soil, and bedrock sulfur, in order to identify sources and biogeochemical processes affecting S cycling in catchments with base poor, siliceous bedrock. Stable S isotope data indicated that atmospheric deposition and not mineral weathering is the major source of S in both catchments since delta(34)S-values for sulfate in the soil, in seepage water, and in stream water were generally found to be similar to the mean delta(34)S-values of precipitation SO42- (+2.1 parts per thousand). However, delta(18)O-values of seepage water SO42- at 30 cm and especially at 80 cm depth were depleted by several per mil with respect to those of the atmospheric deposition (+7.5 to +13.5 parts per thousand). This indicates that in both catchments a considerable proportion of the seepage water SO42- is derived from mineralization of carbon-bonded soil S and must therefore have cycled through the organic soil. S pool. delta(34)S-values for different S compounds in the solid soil were found to differ markedly depending on S fraction and soil depth. Since atmospheric S deposition with rather constant delta(34)S-values was identified as the dominant S source in both catchments, this is interpreted as a result of in situ isotope fractionation rather than admixture of isotopicallydifferent S. The differences between the delta(34)S-values of seepagewater and soil sulfate and those of organic soil S compounds are consistent with a model in which SO42- uptake by vegetation and soil microorganisms favours (SO42-)-S-34 Slightly, whereas during mineralizationof organic soil S to aqueous SO42-, S-32 reacts preferentially. However, the data provide evidence for negligible isotope fractionation during physico-chemical S transformations such as adsorption/desorption in aerated forest soils.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 08:39:52