Summary
The effects of zinc added to a diluvial sandy clay loam soil on its microflora and the metabolic products of amended glucose in the soil were investigated, and its influences on both biological and chemical turnover are discussed.
Changes in the soil microflora were followed by counting the microbes and measuring their contributions to soil respiration. The transformations of 14C-glucose products were traced in five divided fractions.
Amended glucose was readily assimilated into microbial tissues and transformed to metabolites in the control soil. Within the initial 24 h of the incubation, most of the glucose was decomposed and about 40% of the substrate evolved as carbon dioxide. This primary metabolism was attributed to the bacterial population, and the subsequent secondary metabolism was associated with fungal growth rather than
bacteria. On the other hand, zinc (1000 μg/g) added as chloride prolonged the primary metabolism of glucose and a large part of the incubation period for 96 h was occupied by this metabolism, which was mostly dependent on the fungal population. Viable bacterial number noticeably within the first 24 h of the incubation. During the course of the subsequent incubation, however, this number increased and the selection for zinc tolerance was suggested.
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Ohya, H., Komai, Y. & Yamaguchi, M. Zinc effects on soil microflora and glucose metabolites in soil amended with 14C-glucose. Biol Fert Soils 1, 117–122 (1985). https://doi.org/10.1007/BF00301778
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DOI: https://doi.org/10.1007/BF00301778