HR: 08:00h
AN: B51E-01 INVITED     [Abstracts]
TI: Storage of Organic Matter as Related to Organic and Mineral Properties of Soils
AU: * Kogel-Knabner, I
EM: koegel@wzw.tum.de
AF: Technische Universit�t M�nchen, Lehrstuhl f�r Bodenkunde, Freisling, D85350 Germany
AB: This paper reviews the composition of organic matter stabilized in temperate soils as revealed from solid-state $^{13}$C NMR spectroscopy and chemolytic techniques of bulk soils and particle-size and/or density fractions. The stability of the organic matter in these fractions is assessed using stable isotope or radiocarbon analysis. An attempt is made to elucidate the relevance of the mechanisms that are responsible for the stabilization of organic matter in different soils. These include recalcitrance of organic matter, spatial inaccessibility of organic matter to decomposer organisms due to aggregation and vertical distribution within the soil profile, and stabilisation by interaction with mineral surfaces (oxide-characteristic reactive surfaces versus phyllosilicates).
DE: 0815 Informal education
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting