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Applied and Environmental Soil Science
Volume 2009 (2009), Article ID 671359, 5 pages
http://dx.doi.org/10.1155/2009/671359
Research Article

Humus and Humic Acids of Luvisol and Cambisol of Jiguli Ridges, Samara Region, Russia

1Department of Soil Science and Soil Ecology, 199178 Saint-Petersburg University, 16-line, Vasilyevskiy Island, Saint-Petersburg, Russia
2Department of Biological and Environmental Science, Faculty of Agriculture, Kobe University, Kobe 657-8501, Japan
3Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Hachiouji-shi, Tokyo 192-0397, Japan

Received 18 December 2008; Revised 30 March 2009; Accepted 20 August 2009

Academic Editor: Teodoro Miano

Copyright © 2009 Evgeny Abakumov et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Luvisols and Cambisols are two types of sub-boreal soils, which are known as continental and humid-ocean types of soils in deciduous forests respectively. Morphological features of soil, which are frequently used as the main argument in solum diagnostics, are subjective and do not give final decision that continental Cambisols are a specific type of soils different from Luvisols. These soils were studied in a mountain massive—Jiguli ridges of Samara region, Russia, East European part. Humid climate of northern slopes leads to formation of brown type of humic acids (HA), while the conditions of eastern slopes assist to formation of gray HA. These HAs of different soils are different in elemental composition (C and N are higher in Cambisols, O is higher in Luvisols), carbon species according to 13-C NMR (aromaticity is higher in Luvisols, while the aliphatic, carbonylic and carboxylic compounds are higher in Cambisols). Cambisols are characterized by dominance of fulvic acids (FAs) on HAs, while the ratio of HA to FA groups in Luvisols is about 1,0. Essential differences in humus composition and humic acids properties confirm that local humid climate in continental forest-steppe leads to formation of Cambisols instead of zonal Luvisols.