Changes in Properties of Soils in Foci of Siberian Moth (Dendrolimus sibiricus) Outbreaks

摘要

The experimental data on the transformation of properties of soddy-deeply podzolic soilsa nd raw humus burozems under fir forests defoliated by the Siberian moth Dendrolimus sibiricus are analyzed.In the first two months after the addition of Siberian moth excrements to the forest litter,the population of all ecological-trophic groups of microorganisms was shown to increase by 13 times,that of ammonifying phototrophs and microorganisms,taking part in humus mineralization,by 42 and 9 times,respectively.The leaching of water-soluble carbon from litters in forests defoliated by the Siberian moth was by 21-26% higher than that from litters of control ones.A year later,it was reduced to 14%.The content of exchangeable hydrogen and total acidity decreased,and the degree of base saturation increased.Within 5-6 years after the Siberian moth invasion,the transformation of physicochemical,chemical,and microbiological properties of soils was specified by succession development of the plant cover.