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SPP 1090 AG 1: Stabilization of dissolved organic matter (DOM) in mineral subsoils as indicated by spectroscopic properties and the Al saturation
Project
Project code: DFG SPP 1090
Contract period: 01.01.2000
- 01.01.2008
Purpose of research: Basic research
Although large amounts of dissolved organic matter (DOM) are leached from the forest floor into mineral subsoils little is known about the contribution of (DOM) to the formation of stabilized organic matter in the subsoil. The objective of this project is an estimation of DOM stabilization in dependence on DOM properties. Incubation studies with DOM solutions and soil columns enriched with DOM are carried out to reveal relations between DOM properties and its microbial stability. Soils and DOM samples come from experimental plots of the BITÖK near Bayreuth and the fertilization experiments in Bad Lauchstädt. We use spectroscopic methods which allow a determination of DOM properties of the untreated DOM sample with a limited expense. Furthermore we test the influence of Al saturation on the microbial stability of DOM. C and N turnover in the subsoil caused by DOM will be quantified by measuring d13C and d15N ratios of DOM and subsoil organic matter. The results obtained in the laboratory will be combined with DOM fluxes measured in the field to estimate the net accumulation of DOM in mineral
Section overview
Subjects
- Soil science
