HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (28) Citing Articles via Google Scholar Google Scholar Articles by Solomon, D. Articles by Zech, W. Search for Related Content PubMed Articles by Solomon, D. Articles by Zech, W. GeoRef GeoRef Citation Agricola Articles by Solomon, D. Articles by Zech, W. Related Collections Soil Fertility and Productivity Soil Biochemistry Soil Chemistry

Soil Organic Matter Composition in the Subhumid Ethiopian Highlands as Influenced by Deforestation and Agricultural Management

^a Institute of Soil Science and Soil Geography, Univ. of Bayreuth, Universitätsstr.30, D-95440 Bayreuth, Germany
^b Ethiopian Agricultural Research Organization, Debre Zeit Agricultural Research Center, P.O. Box 32, Debre Zeit, Ethiopia

View larger version (34K): [in a new window]   Fig. 1. Soil organic carbon (SOC) and total N contents and C/N ratios in size separates of the different land-use systems at the Wushwush and Munesa sites. Letters above the bars indicate significant differences between mean values of the same size separates of the different land use systems at P < 0.05; N. forest, natural forest; T. plantation, Tea plantation; C. plantation, Cupressus plantation.

View larger version (101K): [in a new window]   Fig. 2. Scanning electron microscope micrographs (acceleration voltage = 15 kV) of organic matter associated with (a) coarse sand (2000–250 µm), (b) fine sand (250–20 µm), (c) silt (20–2 µm) and (b) clay (<2 µm) size separates of soils from the natural forest of the Munesa site.

View larger version (39K): [in a new window]   Fig. 3. Average concentrations of CuO-oxidation products (VSC) and ratios of lignin-derived phenols in size separates of the different land use system at the Wushwush and Munesa sites. VSC, vanillyl+syringyl+cinnamyl; (Ac/Al)V,S, acid to aldehyde ratio of vanillyl and syringyl; S/V, syringyl to vanillyl ratio; letters above the bars indicate significant differences between mean values of the same size separates of the different land use systems at P < 0.05; bars without letters are not significant; N. forest, natural forest; T. plantation, Tea plantation; C. plantation, Cupressus plantation.

View larger version (43K): [in a new window]   Fig. 4. Average concentrations of noncellulosic carbohydrates and ratios of sugar monomers in size separates of the different land-use systems at the Wushwush and Munesa sites. (Gal + Man)/(Ara + Xyl), galactose + mannose to arabinose + xylose; (Fuc + Rha/Ara + Xyl), fucose + rhamnose to arabinose + xylose; Letters above the bars indicate significant differences between mean values of the same size separates of the different land use systems at P < 0.05; N. forest, natural forest; T. plantation, Tea plantation; C. plantation, Cupressus plantation.

View larger version (38K): [in a new window]   Fig. 5. Total amino sugar concentrations and ratios of glucosamine to galactosamine (GlcNl + GalN) and glucosamine to muramic acid (GluN + MurA) in size separates of the different land use systems at the Wushwush and Munesa sites. Letters above the bars indicate significant differences between mean values of the same size separates of the different land use systems at P < 0.05; N. forest, natural forest; T. plantation, Tea plantation; C. plantation, Cupressus plantation.

View larger version (18K): [in a new window]   Fig. 6. Solution 13C NMR spectra of alkali-extractable organic matter in bulk soil and size separates of the different land use systems at the Wushwush site.

View larger version (18K): [in a new window]   Fig. 7. Solution 13C NMR spectra of alkali-extractable organic matter in bulk soil and size separates of the different land use systems at the Munesa site.