Description: Das Projekt "Spatial heterogeneity and substrate availability as limiting factors for subsoil C-turnover" wird vom Umweltbundesamt gefördert und von Universität Bochum, Geographisches Institut durchgeführt. In subsoils, organic matter (SOM) concentrations and microbial densities are much lower than in topsoils and most likely highly heterogeneously distributed. We therefore hypothesize, that the spatial separation between consumers (microorganisms) and their substrates (SOM) is an important limiting factor for carbon turnover in subsoils. Further, we expect microbial activity to occur mainly in few hot spots, such as the rhizosphere or flow paths where fresh substrate inputs are rapidly mineralized. In a first step, the spatial distribution of enzyme and microbial activities in top- and subsoils will be determined in order to identify hot spots and relate this to apparent 14C age, SOM composition, microbial community composition and soil properties, as determined by the other projects within the research unit. In a further step it will be determined, if microbial activity and SOM turnover is limited by substrate availability in spatially distinct soil microsites. By relating this data to root distribution and preferential flow paths we will contribute to the understanding of stabilizing and destabilizing processes of subsoil organic matter. As it is unclear, at which spatial scale these differentiating processes are effective, the analysis of spatial variability will cover the dm to the mm scale. As spatial segregation between consumers and substrates will depend on the pore and aggregate architecture of the soil, the role of the physical integrity of these structures on SOM turnover will also be investigated in laboratory experiments.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Bochum ? Substrat ? Kohlenstoff ? Gelöster organischer Kohlenstoff ? Architektur ? Bodenkunde ? Bodenstruktur ? Enzym ? Gebäude ? Rhizosphäre ? Organisches Material ? Pflanzenwurzel ? Oberboden ? Unterboden ? Bodenqualität ? Bauliche Anlage ? Abscheidung ? Daten ? Mikroorganismen ? Laborversuch ? Boden ? Biologische Aktivität ? Lebensalter ? Abdeckung ? Bauelement ? Forschung ? Forschungseinrichtung ? Raumstruktur ? Erlass [Recht] ? VERFUEGBARKEIT ? DICHTE ? DACH ? Fluss [Bewegung] ? WICHTIG ? GEMEINSCHAFT ? Konzentrat ? NEU ? PFAD ? Buchgrundstück ? EINGESCHRAENKT ? EINSCHRAENKENDER FAKTOR ? VERTEILUNG ? EXPERIMENT ? VERWANDT ? PROJEKT ? SONSTIG ? VERARBEITEN ? VERBRAUCHER ?
Region: Nordrhein-Westfalen
Bounding box: 6.76339° .. 6.76339° x 51.21895° .. 51.21895°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2013-01-01 - 2024-11-29
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