| УДК |
Аннотация: The paper describes the distribution of acidity in the soil profile, especially in the podzol profile, and gives some data regarding the effect of the storage of the soil samples on acidity, and the differences between the pH-values in water and in KC1. Storage of the samples has generally lowered the acidity, particularly so in strongly podzolized soils. The changes were least in brown earth and in weakly podzolized soil. Research on the distribution of acidity shows that the pH-value first rises (from surface of mineral soil onwards) with increasing depth, reaches a maximum at the lower part of the B-horizon, and thereupon falls, soon to rise to the value which is characteristic of the subsoil in question. In ordinary northern podzol soils, this maximum is found between 25 and 35 cm, and the decrease between 35 and 45 cm. The chemical differentiation of the profile is generally the folowing: the maximum of humus is uppermost, than tha maximum of sesqui-oxides and underneath that of the pH-values. The ph-difference between water and KC1 was least in the B-horizon, and greatest in strongly washed A-horizon and in the subsoil of grass-herb forests.
Экземпляры всего: 1
ИЛ-Иф (1)
Свободны: ИЛ-Иф (1)