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Chloride retention in forest soil by microbial uptake and by natural chlorination of organic matter
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SYSNO ASEP 0305908 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Chloride retention in forest soil by microbial uptake and by natural chlorination of organic matter Title Chloride retention in forest soil by microbial uptake and by natural chlorination of organic matter Author(s) Bastviken, D. (SE)
Thomsen, F. (SE)
Svensson, T. (SE)
Karlsson, S. (SE)
Sandén, P. (SE)
Shaw, G. (GB)
Matucha, Miroslav (UEB-Q)
Öberg, G. (CA)Source Title Geochimica et Cosmochimica Acta. - : Elsevier - ISSN 0016-7037
Roč. 71, č. 13 (2007), s. 3182-3192Number of pages 11 s. Language eng - English Country GB - United Kingdom Keywords CHLOROACETIC ACIDS ; BOUND CHLORINE ; DEGRADATION Subject RIV DF - Soil Science R&D Projects GA526/05/0636 GA ČR - Czech Science Foundation (CSF) Next source Other public resources CEZ AV0Z50380511 - UEB-Q (2005-2011) DOI 10.1016/j.gca.2007.04.028 Annotation Inorganic chlorine (i.e. chloride; Cl-in) is generally considered inert in soil and is often used as a tracer of soil and ground water movements. However, recent studies indicate that substantial retention or release of Cl-in can occur in soil, but the rates and processes responsible under different environmental conditions are largely unknown. We performed Cl-36 tracer experiments which indicated that short-term microbial uptake and release of Cl-in, in combination with more long-term natural formation of chlorinated organic matter (Cl-org), caused Cl-in imbalances in coniferous forest soil. Extensive microbial uptake and release of Cl-in occurred over short time scales, and were probably associated with changes in environmental conditions. Up to 24% of the initially available Clin within pore water was retained by microbial uptake within a week in our experiments, but most of this Cl-in, was released to the pore water again within a month, probably associated with decreasing microbial populations. The natural formation of Clorg resulted in a net immobilization of 4% of the initial pore water Clin over four months. If this rate is representative for the area where soil was collected, Clorg formation would correspond to a conversion of 25% of the yearly wet deposition of Cl-in. The study illustrates the potential of two Clin retaining processes in addition to those previously addressed elsewhere (e.g. uptake of chloride by vegetation). Hence, several processes operating at different time scales and with different regulation mechanisms can cause Clin imbalances in soil. Altogether, the results of the present study (1) provide evidence that Cl-in cannot be assumed to be inert in soil, (2) show that microbial exchange can regulate pore water Cl-in, concentrations and (3) confirm the controversial idea of substantial natural chlorination of soil organic matter. Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2008
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