Description: Das Projekt "Origin and fate of dissolved organic matter in the subsoil" wird vom Umweltbundesamt gefördert und von Leibniz Universität Hannover, Institut für Bodenkunde durchgeführt. Dissolved organic matter (DOM) is one major source of subsoil organic matter (OM). P5 aims at quantifying the impact of DOM input, transport, and transformation to the OC storage in the subsoil environment. The central hypotheses of this proposal are that in matric soil the increasing 14C age of organic carbon (OC) with soil depth is due to a cascade effect, thus, leading to old OC in young subsoil, whereas within preferential flowpaths sorptive stabilization is weak, and young and bioa-vailable DOM is translocated to the subsoil at high quantities. These hypotheses will be tested by a combination of DOC flux measurements with the comparative analysis of the composition and the turnover of DOM and mineral-associated OM. The work programme utilizes a DOM monitoring at the Grinderwald subsoil observatory, supplemented by defined experiments under field and labora-tory conditions, and laboratory DOM leaching experiments on soils of regional variability. A central aspect of the experiments is the link of a 13C-leaf litter labelling experiment to the 14C age of DOM and OM. With that P5 contributes to the grand goal of the research unit and addresses the general hypotheses that subsoil OM largely consists of displaced and old OM from overlying horizons, the sorption capacity of DOM and the pool size of mineral-associated OM are controlled by interaction with minerals, and that preferential flowpaths represent 'hot spots' of high substrate availability.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Hannover ? Schlichtemittel ? Substrat ? Organischer Kohlenstoff ? Kleinkind ? Skigebiet ? Bodenkunde ? Siedlungsabfall ? Organisches Material ? Teich ? Wirkung ? Unterboden ? Gelöster organischer Kohlenstoff ? Messung ? Ackerland ? Auslaugung ? Bodenbewirtschaftung ? Messdaten ? Sorption ? Vergleichsanalyse ? Boden ? Lebensalter ? Wirkung ? Bodenmonitoring ? Bauelement ? Forschung ? Forschungseinrichtung ? Lagerung ? Mineral ? Umwelt ? Verkehr ? Arbeit ? Bemessung ? Jungwald ? KENNZEICHNUNG ? Kaskade [Verfahrenstechnik] ? LEISTUNGSFAEHIGKEIT ? MISCHUNG ? Muskelarbeit ? REGIONAL ? STABILISIERUNG ? UNTER ? VERBLEIB ? VERFRACHTUNG ? VERFUEGBARKEIT ? VERHAELTNIS ? VORSCHLAEGE ? VORSCHLAG ? Vermehrung ? EIN ? EXPERIMENT ? ASPEKT ? GELOEST ?
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: 2013-01-01 - 2024-11-29
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