Soil Biology and Biochemistry, Sept, 2012, Vol.52, p.29(4)
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.soilbio.2012.04.002 Byline: Klaus Kaiser (a), Karsten Kalbitz (b) Abstract: Dissolved organic matter has been recognized as mobile, thus crucial to translocation of metals, pollutants but also of nutrients in soil. We present a conceptual model of the vertical movement of dissolved organic matter with soil water, which deviates from the view of a chromatographic stripping along the flow path. It assumes temporal immobilization (sorptive or by co-precipitation), followed by microbial processing, and re-release (by desorption or dissolution) into soil water of altered compounds. The proposed scheme explains well depth trends in age and composition of dissolved organic matter as well as of solid-phase organic matter in soil. It resolves the paradox of soil organic matter being oldest in the youngest part of the soil profile - the deep mineral subsoil. Author Affiliation: (a) Soil Sciences, Martin Luther University Halle-Wittenberg, von-Seckendorff-Platz 3, 06120 Halle (Saale), Germany (b) Earth Surface Science, Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands Article History: Received 29 August 2011; Revised 29 March 2012; Accepted 2 April 2012
Soils -- Analysis ; Flow (Dynamics) -- Analysis ; Soil Moisture -- Analysis
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