Correlation between aggregate stability and microbiological activity in two Russian soil types

Abstract

Two Russian soil type, soddy-podzolic soil  from Vladimerskaya region and dark-gray forest soil from Korskya region  were taken .some microbiological parameters were assyed as basal respiration, substrate induced respiration, microbial biomass, microbial metabolic coefficient and correlated with soil aggregate stability concerning  soil organic matter ,soil texture and soil bulk density . The result shown a positive correlation between all microbiological parameters with soil aggregate stability at this rank, microbial metabolic coefficient > microbial biomass = substrate induced respiration > basal respiration. Microbiological parameters and soil aggregate stability in dark-gray forest soil are greater than soddy-podzolic soil except basal respiration as a result of high organic content in this soil as will as the biomass as a percent of soil total organic matter. aggregate disintegration coefficient of dark-gray forest soil is 0.0028 with R² 0.927  and  need 85 rain drop (equivalent to an energy of 83385 J Kg^-1) greater than soddy-podzolic  which had disintegration coefficient 0.0039 with R² 0.849   and  needed only 40 rain drop (equivalent to an energy of 39240 J Kg^-1).

Keywords

• substrate induced respiration, basal respiration, biomass, aggregate stability, soil organic matter

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