A Study of the Root System of the Beech in Woodland Soils, with Especial Reference to Mycorrhizal Infection

Abstract

The variation in the distribution of fine roots in 3 types of woodland soil was investigated by subjective and quantitative means. The accumulation of raw humus on the soil was correlated with the conc. of fine roots in the surface layers. At the same time the extent of mycorrhizal infection was greatly increased. By means of analyses, the high N content of the root system in raw humus soils, which is a reflection of mycorrhizal infection, was found to be unrelated to the supply of N to the leaves and buds of adult trees. Finally a consideration of chemical analyses and of estimations of the microorganisms populating soils indicated that mycorrhizal infection is without doubt a function of the soil system.