Description: Das Projekt "Origin and composition of organic N forms and related stabilization mechanisms in a soil chronosequence" wird vom Umweltbundesamt gefördert und von Leibniz Universität Hannover, Institut für Bodenkunde durchgeführt. This project aims at the mechanisms of organic nitrogen (N) stabilization in native rainforest soils with special emphasis on the mineralogical control. It bases on the 'long substrate aging gradient' chronosequence at Hawaiian Islands (USA) that covers substrate ages from 300 to 4.1 x 106 years at otherwise fairly constant environmental variables. This allows to track changes in organic N accumulation and stabilization as related to mineral composition, which changes during soil formation. The proposal addresses the following aspects: (i) accumulation of organic N forms in bulk and clay-size fractions of soil horizons and transformation of organic N across the differently aged sites as analysed by proteomics, biomarker analysis, and enzyme activity measurements, (ii) investigation of the mineralogical vs. organic matter control on N preservation by relating mineral phase variables and organic matter properties to the composition of organic N, as revealed by wet chemical methods and X-ray absorption near edge structure (N-XANES), and (iii) localization, concentration, and composition of stabilized organic N forms using degradation techniques. Finally we test in batch sorption and incubation experiments if (iv) sorptive interaction of N compounds with mineral phases can account for the observed patterns of organic N accumulation, transformation, and stabilization. We expect novel insight into origin and stabilization mechanisms of organic N forms in soil.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Rochen ? Hannover ? Messstation ? Resorption ? Röntgenstrahlung ? Schlichtemittel ? Substrat ? Biomarker ? USA ? Buchhaltung ? Organische Stickstoffverbindung ? Island ? Absorption ? Bodenkunde ? Enzym ? Gebäude ? Organisches Material ? Konservierung ? Insel ? Lehm ? Bodenbildung ? Bodenhorizont ? Chemikalien ? Regenwald ? Sorption ? Standortwahl ? Technik ? Boden ? Chemische Stoffeigenschaft ? Anreicherung ? Mineral ? Umwelt ? Abbau ? Abdeckung ? ASPEKT ? Basen [chemisch] ? Bemessung ? Buchgrundstück ? EXPERIMENT ? FORMBLAETTER ? FRAKTION ? KONTROLLE ? Konzentrat ? MECHANISMEN ? METHODE ? NEU ? Ortsbestimmung ? PROJEKT ? STABILISIERUNG ? UNTERSUCHUNG ? VERBINDUNG ? VERWANDT ? VORSCHLAEGE ? VORSCHLAG ? Wechselwirkung ? Aktivitätsmessung ? ALT ? Alterung ? BESONDER ?
Region: Lower Saxony
Bounding box: 9.16667° .. 9.16667° x 52.83333° .. 52.83333°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2006-01-01 - 2011-12-31
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