Methodical features of evaluation of the ectomycorrhiza formation: variability in connection with depth

The article considers the formation peculiarities of lateral nondeterminate roots, absorbing roots and ectomycorrhizas depending on the depth of soil layers in Pinus sylvestris seedlings. The highest activity of all organs formation is observed at the top of a substrate in layer 40-120 mm from the soil surface. A representation of the functional areas of root systems in which different realized growth functions and acquisitions functions. The standard deviations in determining different characteristics of the root and mycorrhizas structure, which may be the result of incorrect selection sampling depth, may comprise 1.5-5 times or more.