Influence of the fractional composition of humus substances on the proportion of water-resistant aggregates

Influence of the fractional composition of humus
substances on the proportion of water-resistant
aggregatesDownload file(Article is in )
TOBIAŠOVÁ, E., DĘBSKA , B., PORHAJAšOVá, J.INFLUENCE OF THE FRACTIONAL COMPOSITION OF HUMUS SUBSTANCES ON THE PROPORTION OF WATER-RESISTANT AGGREGATES

2015, 16(2), p.131 - 139, DOI: http://dx.doi.org/10.5513/JCEA01/16.2.1599

Abstract

In this study, the influence of humus substances on soil structure of six soils (HaplicChernozem, Mollic Fluvisol, Eutric Fluvisol, Rendzic Leptosol, Eutric Cambisol, andHaplic Luvisol) of different ecosystems (forest, meadow, urban, and agro-ecosystem)in Slovakia was compared. The influence of the fractional composition of humussubstances on the proportion of the fractions of water-resistant aggregatesin different ecosystems was assessed. The fractions of free humic acids and thosebound with monovalent cations and mobile R2O3 (r = 0.387; P < 0.05 and r = 0.415;P < 0.01), humic acids bound to the mineral components of the soil and stabile R2O3(r = 0.477; P < 0.01 and r = 0.396; P < 0.01), and fulvic acids bound to the mineralcomponents of the soil and stabile R2O3 (r = 0.504; P < 0.01 and r = 0.333; P < 0.05),had the most positive influence on the formation of larger (1-2 and 2-3 mm) waterresistantmacro-aggregates. The amount of the extracted humus substances wasthe highest in agro-ecosystem > urban ecosystem > meadow ecosystem > forestecosystem.

Keywords:
water-resistant aggregateshumus substancesecosystem