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Wiesenberg, Guido L. B. ; Schwark, Lorenz ; Schmidt, Michael W. I.:
Extractable lipid contents and colour in particle-size separates and bulk arable soils.
In: European Journal of Soil Science.
Bd. 57
(2006)
Heft 5
.
- S. 634-643.
ISSN 1351-0754
DOI: https://doi.org/10.1111/j.1365-2389.2005.00754.x
Abstract
Chemical alteration of plant biomass to soil organic matter is often accompanied by characteristic trends, e.g. with decreasing particle size and increasing depth organic carbon and nitrogen concentrations and stable carbon isotope values (δ13C) often increase. In agricultural soils, systematic studies of soil organic carbon (SOC) distribution in bulk soils and particle-size separates of depth profiles are scarce. In this study, three soil profiles from one site with different monoculture crops were analysed for organic carbon and nitrogen concentrations, stable carbon isotopes, bulk extractable lipids, and soil colour. In contrast to most previous observations, stable carbon isotope values were constant over soil depth and within particle-size separates, probably as a result of little biomass input due to the harvesting techniques applied and the presence of fossil carbon. Bulk extractable lipids contributed 1–10% to the total SOC. Significantly more lipids could be extracted from rye- than from maize-derived SOC. Lipid yields normalized to soil mass increased with decreasing particle size and decreased with depth. When normalized to organic carbon concentration, sand-size fractions had the largest lipid yields. Soil colour, expressed as Munsell values, was lightest in sand- and silt-size separates. A cross-plot of Munsell values and their SOC concentrations revealed characteristic, non-overlapping areas for each particle-size class and the bulk soils. Clay-size separates and bulk soils were almost identical in Munsell values, although for clay-size separates SOC concentrations were much larger than for bulk soils. Thus, the SOC-rich clay-size separates exerted the dominant influence on the colour of the bulk soils. Determination of colour and extractable lipid contents could be useful additional parameters for soil characterization.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER47698 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 21 Aug 2015 06:49 |
| Letzte Änderung: | 22 Apr 2016 07:18 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/18450 |