The Effect of DryingMoistening and FreezingThawing
on Soil Microbial Communities Resilience

N. D. Anan’eva, E. V. Blagodatskaya, and T. S. Demkina

Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushchino, Moscow oblast, 142292 Russia

Received October 5, 1995

Abstract—The effect of drying–moistening and freezing–thawing on the microbiological activity of gray for
est soil under three cenoses (forest, meadow, and plowland) was investigated. The following indices of activity
were studied: rates of basal (V_b) and substratum-induced respiration (V_SIR), and coefficient of microbial respi
ration (Q_R; Q_R = V_b / V_SIR). It was shown that the coefficient of microbial respiration displayed rather high sen
sitivity, and could be used to quantify the resilience of the microbial community. Thawing of the frozen soil
induced a stronger effect on the stability of microbial communities than moistening of the dry soil.

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