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2331. Gupta, V., and Germida, J.J.. 1988. Distribution of microbial biomass and its activity in different soil aggregate size classes as affected by cultivation.. Soil Biol. Biochem. 20:777-786.
Investigated the effects of 69 yr of cultivation on the nature, distribution, and activity of microbial biomass content in different microaggregate size classes of a native and cultivated soil. Microaggregates (<0.25mm) of both soils contained lower organic-C, microbial biomass, enzymes, and respiration compared to macroaggregates. The negative effects of cultivation were more pronounced on macroaggregates. These results suggest that microbial biomass, especially fungi, plays an important role in the formation of macroaggregates and is the labile organic matter that serves as the primary source of C and nutrients released following cultivation.