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Plant-soil interactions in changing rice cropping systems and their influence on C and N dynamics

Description: Das Projekt "Plant-soil interactions in changing rice cropping systems and their influence on C and N dynamics" wird vom Umweltbundesamt gefördert und von Universität Bonn, Institut für Nutzpflanzenwissenschaften und Ressourcenschutz - Pflanzenernährung (Prof. Werner) durchgeführt. Plant-soil interactions drive the input, cycling and losses of C and N in soil. This subproject aims at elucidating the input and fate of C in the soil-plant systems and its effect of N retention in soil under different paddy management (continuous vs. alternating with maize cropping). In particular we will investigate (i) how much of the assimilate C is released by the plants into the rhizosphere soil, and how this rhizodeposition is affected by N supply, soil density and crop variety during plant development, (ii) how the exudation of C and N responds to land use change, (iii) how C released into the rhizosphere affects the turnover of soil C and utilization of fertilizer N, and (iv) to what degree leaching contributes to the loss of C and N from the rooted surface soil. To answer these questions, we will combine the use of isotopic 13C and 15N labeling in laboratory and field experiments with a sophisticated characterization of root exudates, root border cells, and compound-specific isotope tracing in the residues of bacteria and fungi in rhizosphere, bulk soil as well as within different dissolved organic and inorganic carbon species in soil leachates. In this way and in collaboration with SP 2, 5, 6, and 7 of this research unit, our project links the cycling of C and N in paddy soils to one of its most prominent drivers, the release of organic compounds by roots.

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SupportProgram

Origin: /Bund/UBA/UFORDAT

Tags: Bonn ? Reis ? Bodenkohlenstoff ? Getreide ? Mais ? Bodenbakterien ? Düngemittel ? Skigebiet ? Brunnen ? Bodenkunde ? Landnutzungsänderung ? Isotopentechnik ? Rhizosphäre ? Sickerwasser ? Wirkung ? Pflanzenwurzel ? Bakterien ? Organische Verbindung ? Gelöster organischer Kohlenstoff ? Ackerland ? Auslaugung ? Bodenbewirtschaftung ? Bodenbildung ? Isotop ? Management ? Pflanzenernährung ? Versorgung ? Zelle ? Pilz ? Boden ? Schaden ? Wirkung ? Forschung ? Fahrradfahren ? Ressourcenschutz ? Rückstand ? Bauelement ? Forschungseinrichtung ? Freilandversuch ? BESCHREIBUNG ? SPEZIFISCH ? UNTER ? VERBINDUNG ? VERBLEIB ? Verwertung ? Wechselwirkung ? Bepflanzung ? DICHTE ? EIN ? EINSATZ ? ENTWICKLUNG ? FRAGE ? GELOEST ? GRENZE ? Art [Spezies] ? KENNZEICHNUNG ? OBERFLAECHE ? PROJEKT ?

Region: Nordrhein-Westfalen

Bounding box: 6.76339° .. 6.76339° x 51.21895° .. 51.21895°

License: cc-by-nc-nd/4.0

Language: Deutsch

Organisations

Time ranges: 2011-01-01 - 2014-12-31

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