Details
Original language | English |
---|---|
Pages (from-to) | 685-692 |
Number of pages | 8 |
Journal | Journal of Plant Nutrition and Soil Science |
Volume | 167 |
Issue number | 6 |
Publication status | Published - Dec 2004 |
Abstract
Aliphatic C most probably derived from ester-bound moieties was found to be present in sandy subsoil horizons. The hydrophobic nature of such compounds may increase their stabilization potential. Therefore, the aim of this study was to investigate the potential of aliphatic compounds in mineral soil horizons along a Dystric Cambisol profile under beech forest to increase hydrophobicity. The conceptual approach included the analyses of soil samples before and after solvent extraction and base hydrolysis for elemental and isotopic composition. Additionally, the advancing contact angle was measured to quantify hydrophobicity. Curie-point pyrolysis GC/MS was carried out to characterize the nature of alkyl C present in subsoil samples. A close correlation between the 14C activity and the stable-C-isotope ratio (δ13C) indicates isotopic fractionation upon C stabilization in subsoils. Free lipids contributed less than 10% to the organic C found in subsoil horizons. Base hydrolysis revealed very high amounts of hydroxyalkanoic acids in the B horizons of the acid forest soil. Hydrophobicity of SOM was not found to be correlated to esterified- or free-lipid content. The contact angle was in a similar range for all bulk soil horizons, suggesting greater hydrophobicity of organic matter in subsoil horizons considering their very low concentrations of organic C compared to the A horizon. The quantity and nature of pyrolysis products change with increasing depth in the soil profile. Aliphatic products cannot be detected in B and C horizons by Curie-point pyrolysis GC/MS.
Keywords
- Alkyl, Carbon, Hydrophobicity, Subsoil
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
- Agricultural and Biological Sciences(all)
- Plant Science
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In: Journal of Plant Nutrition and Soil Science, Vol. 167, No. 6, 12.2004, p. 685-692.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Alkyl C and hydrophobicity in B and C horizons of an acid forest soil
AU - Rumpel, Cornelia
AU - Seraphin, Ariane
AU - Goebel, Marc Oliver
AU - Wiesenberg, Guido
AU - Gonzales-Vila, Francisco
AU - Bachmann, Jörg
AU - Schwark, Lorenz
AU - Michaelis, Walter
AU - Mariotti, André
AU - Kögel-Knabner, Ingrid
N1 - Copyright: Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/12
Y1 - 2004/12
N2 - Aliphatic C most probably derived from ester-bound moieties was found to be present in sandy subsoil horizons. The hydrophobic nature of such compounds may increase their stabilization potential. Therefore, the aim of this study was to investigate the potential of aliphatic compounds in mineral soil horizons along a Dystric Cambisol profile under beech forest to increase hydrophobicity. The conceptual approach included the analyses of soil samples before and after solvent extraction and base hydrolysis for elemental and isotopic composition. Additionally, the advancing contact angle was measured to quantify hydrophobicity. Curie-point pyrolysis GC/MS was carried out to characterize the nature of alkyl C present in subsoil samples. A close correlation between the 14C activity and the stable-C-isotope ratio (δ13C) indicates isotopic fractionation upon C stabilization in subsoils. Free lipids contributed less than 10% to the organic C found in subsoil horizons. Base hydrolysis revealed very high amounts of hydroxyalkanoic acids in the B horizons of the acid forest soil. Hydrophobicity of SOM was not found to be correlated to esterified- or free-lipid content. The contact angle was in a similar range for all bulk soil horizons, suggesting greater hydrophobicity of organic matter in subsoil horizons considering their very low concentrations of organic C compared to the A horizon. The quantity and nature of pyrolysis products change with increasing depth in the soil profile. Aliphatic products cannot be detected in B and C horizons by Curie-point pyrolysis GC/MS.
AB - Aliphatic C most probably derived from ester-bound moieties was found to be present in sandy subsoil horizons. The hydrophobic nature of such compounds may increase their stabilization potential. Therefore, the aim of this study was to investigate the potential of aliphatic compounds in mineral soil horizons along a Dystric Cambisol profile under beech forest to increase hydrophobicity. The conceptual approach included the analyses of soil samples before and after solvent extraction and base hydrolysis for elemental and isotopic composition. Additionally, the advancing contact angle was measured to quantify hydrophobicity. Curie-point pyrolysis GC/MS was carried out to characterize the nature of alkyl C present in subsoil samples. A close correlation between the 14C activity and the stable-C-isotope ratio (δ13C) indicates isotopic fractionation upon C stabilization in subsoils. Free lipids contributed less than 10% to the organic C found in subsoil horizons. Base hydrolysis revealed very high amounts of hydroxyalkanoic acids in the B horizons of the acid forest soil. Hydrophobicity of SOM was not found to be correlated to esterified- or free-lipid content. The contact angle was in a similar range for all bulk soil horizons, suggesting greater hydrophobicity of organic matter in subsoil horizons considering their very low concentrations of organic C compared to the A horizon. The quantity and nature of pyrolysis products change with increasing depth in the soil profile. Aliphatic products cannot be detected in B and C horizons by Curie-point pyrolysis GC/MS.
KW - Alkyl
KW - Carbon
KW - Hydrophobicity
KW - Subsoil
UR - http://www.scopus.com/inward/record.url?scp=19944428253&partnerID=8YFLogxK
U2 - 10.1002/jpln.200421484
DO - 10.1002/jpln.200421484
M3 - Article
AN - SCOPUS:19944428253
VL - 167
SP - 685
EP - 692
JO - Journal of Plant Nutrition and Soil Science
JF - Journal of Plant Nutrition and Soil Science
SN - 1436-8730
IS - 6
ER -