Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Patterns of stable S isotopes in a forested catchment as indicators for biological S turnover
Autor Alewell, C.; Gehre, M.;
Journal / Serie Biochemistry
Erscheinungsjahr 1999
Department ISOBIO; ANA;
Band/Volume 47
Sprache englisch;
Abstract Despite intensive biogeochemical research during the last thirty years, the relative importance of biological S turnover for the overall SO 4 2− budget of forested catchments remains uncertain. The objective of the present study was (i) to gain new insight into the S cycle of theLehstenbach catchment (Northeastern Bavaria, Germany) through the analysis of stable isotopes of S and (ii) to differentiate between sites which are ‘hot spots’ for SO 4 2− reduction and sites where mineralization and adsorption/desorption processes are more important. The δ34S values and SO 4 2− concentrations of soil solutions, throughfall and groundwater at four different sites as well as runoff of the catchment were measured. The relatively low variability of δ34S in throughfall and bulk precipitation was in contrast to the high temporal and spatial variability of δ34S in the soil solution. Sulfate in the soil solution of upland sites was slightly depleted in34S compared to input values. This was most likely due to S mineralization. Sulfate in the soil solution from wetland soils was clearly enriched in34S, indicating dissimilatory SO 4 2− reduction. The observed spatial and temporal patterns of34S turnover and SO 4 2− concentrations might explain the overall balanced S budget of the catchment. At a time of decreasing anthropogenic deposition SO 4 2− is currently released from upland soils. Furthermore, mineralization of organic S may contribute to SO 4 2− release. Wetland soils in the catchment represent a sink for SO 4 2− due to dissimilatory SO 4 2− reduction.
ID 7810
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=7810
Alewell, C., Gehre, M. (1999):
Patterns of stable S isotopes in a forested catchment as indicators for biological S turnover
Biochemistry 47 , 319 - 333