Clay mineral composition modifies decomposition and sequestration of organic carbon and nitrogen in fine soil fractions (CROSBI ID 242605)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Vogel, Cordula ; Heister, Katja ; Buegger, Franz ; Tanuwidjaja, Irina ; Haug, Stephan ; Schloter, Michael ; Kögel-Knabner, Ingrid
engleski
Clay mineral composition modifies decomposition and sequestration of organic carbon and nitrogen in fine soil fractions
The interaction between minerals and organic matter (OM) is a key to the turnover of OM in soils. In particular, clay minerals, iron oxides and charcoal are considered as important constituents affecting the sequestration of carbon (C) and nitrogen (N). Here, we incubated pre-produced artificial soils (842 days) and a natural soil (Ap, Luvisol) with 13C- and 15N-labelled plant litter over 63 days to follow OM turnover and the formation of organo-mineral associations regarding different compositions (montmorillonite (MT), llite (IL), montmorillonite + charcoal (MT+CH), illite + ferrihydrite (IL+FH)). The microbial biomass, salt extractable organic C, the isotopic C and N composition in the bulk soil and the soil fractions (combined density and particle size fractionation) were determined. By comparison of the artificial soils with the natural soil, we were able to show that the produced soil-like systems have OM dynamics comparable to the natu- ral soil. We found out that the decomposition of the added plant litter was affected by the type of clay mineral that formed the artificial soils, as the soil MT exhibited a slower mineralisation compared to IL, which was in line with a lower microbial biomass. Although a high specific surface area (SSA) provides a high sequestration capacity for C and N, smaller amounts were sequestered in the MT soil with a higher SSA compared to the soil IL. We suppose that a more intensive decomposition is associated with a higher microbial biomass and thus leads to higher amounts of microbial products sequestered in the clay-sized fraction. Charcoal and ferrihydrite had no additional effect in this experiment.
Clay minerals , Turnover, Organo-mineral associations, Incubation, Stable isotopes, Artificial soils
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Podaci o izdanju
51 (4)
2015.
427-442
objavljeno
0178-2762
1432-0789
10.1007/s00374-014-0987-7
Povezanost rada
Poljoprivreda (agronomija)