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Spatial Heterogeneity of Soil Acidity in Spruce Biogeocenose in the Northern Taiga Subzone. P. 5–12

Версия для печати

Section: Geosciences

UDC

574.47+57.087.1

Authors

Volkov Aleksey Gennad'evich
Postgraduate Student, Forestry Engineering Institute, Northern (Arctic) Federal University named after M.V. Lomonosov (Arkhangelsk, Russia)
е-mail: jonlordeg@rambler.ru

Abstract

The soil covering acidity is one of the basic soil fertility factors. Mulch is an important element of the soil covering, which is on the surface. So, it is necessary to study the acidity in the system “mulch-soil”. The features of the vertical variability and horizontal heterogeneity of the soil and mulch reverse acidity in the bilberry scrub forest of the northern taiga subzone are considered. The sampling area is a steep slope with a change of the podzolic soils to the dark-humus gleysols. pH(KCl) values are decreased from the upper layers of the forest mulch to the soil mineral horizons. Such reduction leads to the increasing of the index variability. Similarities of reverse acidity changes in the podzolic soils profile and turfy podzolized brown soils were identified. The acidity increases from the forest mulch to the upper mineral soil horizon, whereupon it decreases. The acidity continues to decrease with the deep in the darkhumus- gley soil. At the certain soil types the coefficient of pH(KCl) variation is lower than in biogeocenose generally. Spatial heterogeneity of acidity is not related to the variability of the horizons of forest mulch and soils. The most spatial heterogeneity of pH(KCl) corresponds to the horizons of the forest mulch of the lowest variability (8–13 %). The upper (0–10 cm) mineral soil horizon is the most smoothed and characterized as highly variable (15 %) at the same time. Reverse acidity of limb and enzymic subhorizons of forest mulch is described by a linear model demonstrating their random spatial structure. The acidity of a humic layer of the forest mulch and mineral soil horizons is a spherical model with the correlation radius of 21–47 meters.

Keywords

spatial heterogeneity, soil reverse acidity, taiga subzone, spruce biogeocenose
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