Logo of the Information System for Agriculture and Food Research

Information System for Agriculture and Food Research

Information platform of the Federal and State Governments

FOR 995 P4: Production and stabilization of dissolved organic matter in paddy soils depending on redox conditions


Environment and ressource management

This project contributes to the research aim ' Environment and ressource management'. Which funding institutions are active for this aim? What are the sub-aims? Take a look:
Environment and ressource management

Project code: DFG FOR 995
Contract period: 01.01.2008 - 31.12.2010
Purpose of research: Basic research

The unique features of paddy soils favor large concentrations and fluxes of dissolved organic matter (DOM). Nevertheless, our knowledge about production and stabilization of DOM in paddy soils is scarce although this fraction of soil organic matter is important for greenhouse gas emission and carbon storage in soils. It is assumed that changing redox conditions are the key drivers of DOM dynamics in these soils. However, this hypothesis was not tested so far. The main objective of the project is to study effects of redox conditions on production and stabilization of DOM in paddy soils. Soils of a chronosequence of paddy soil evolution (50 to 1000 years) will be studied in direct comparison to non-paddy soils of the same age. In these soils, exposed to different redox conditions over different periods of times, DOM production and DOM removal from solution by mineralization, sorption and (co-)precipitation with Fe oxides/hydroxides will be determined in laboratory experiments at oxic and anoxic conditions. The use of 13C labeled DOM in column experiments allows for quantification of DOM removal from solution as a cumulative value of several processes but also for quantification of individual processes such as stabilization by binding to Fe oxides/hydroxides and incorporation into the microbial biomass. The results of our project will shed light on the processes in all soils affected by changing redox conditions.

show more show less


Advanced Search