Description: Das Projekt "Soil-gas transport-processes as key factors for methane oxidation in soils" wird vom Umweltbundesamt gefördert und von Universität Freiburg, Institut für Geo- und Umweltnaturwissenschaften, Professur für Bodenökologie durchgeführt. Methane (CH4) is a major greenhouse gas of which the atmospheric concentration has more than doubled since pre-industrial times. Soils can act as both, source and sink for atmospheric CH4, while upland forest soils generally act as CH4 consumers. Oxidation rates depend on factors influenced by the climate like soil temperature and soil moisture but also on soil properties like soil structure, texture and chemical properties. Many of these parameters directly influence soil aeration. CH4 oxidation in soils seems to be controlled by the supply with atmospheric CH4, and thus soil aeration is a key factor. We aim to investigate the importance of soil-gas transport-processes for CH4 oxidation in forest soils from the variability the intra-site level, down to small-scale (0.1 m), using new approaches of field measurements. Further we will investigate the temporal evolution of soil CH4 consumption and the influence of environmental factors during the season. Based on previous results, we hypothesize that turbulence-driven pressure-pumping modifies the transport of CH4 into the soil, and thus, also CH4 consumption. To improve the understanding of horizontal patterns of CH4 oxidation we want to integrate the vertical dimension on the different scales using an enhanced gradient flux method. To overcome the constraints of the classical gradient method we will apply gas-diffusivity measurements in-situ using tracer gases and Finite-Element-Modeling. Similar to the geophysical technique of Electrical Resistivity Tomography we want to develop a Gas Diffusivity Tomography. This will allow to derive the three-dimensional distribution of soil gas diffusivity and methane oxidation.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Freiburg ? Treibhausgaskonzentration ? Skigebiet ? Tracer ? Gewächshaus ? Umweltauswirkung ? Bodenökologie ? Bodenkunde ? Bodenstruktur ? Bodentemperatur ? Methan ? Temperatur ? Waldboden ? Gasförmiger Stoff ? Ackerland ? Bodenqualität ? Evolution ? Jahreszeit ? Konsum ? Leitfähigkeit ? Lüftung ? Oxidation ? Pumpe ? Technik ? Versorgung ? Bodenfeuchte ? Boden ? Modellierung ? Chemische Stoffeigenschaft ? Messung ? Kenngröße ? Turbulenz ? Gewebe ? in situ ? Wald ? Verkehr ? Klima ? Ökologischer Faktor ? DRUCK ? VORGABE ? ERGEBNIS ? Finite Elemente ? INDUSTRIELL ? KLASSISCH ? Konzentrat ? METHODE ? NEU ? Bemessung ? VERARBEITEN ? VERBRAUCH ? VERBRAUCHER ? VERFRACHTUNG ? VERTEILUNG ?
Region: Baden-Württemberg
Bounding box: 9° .. 9° x 48.5° .. 48.5°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2013-01-01 - 2024-11-29
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