Spatial variability and estimation of the additivity of acid-base characteristics in pale-podzolic soil of the Central Forest Reserve

摘要

The spatial variability of pH values, H~+ activity in water and KCl suspensions, of exchangable acidity and exchangeable Ca~(2+), Mg~(2+), Na~(2+) and K~+ contents was estimated in the L, F, H, A1A2 and A2 horizons of podzolic soils under spruce forest. The number of soil samles to the taken to obtain reliable values of those characteristics was calculated. Combined (mixed) samples are proved to be inapplicable when mesuring exchangeable acidity in mineral horizonts and exchangeable Ca~(2+), exchangeable Mg~(2+) and pH values in water and KCl suspensions.