Effects of Copper on the Metabolism of ^<14>C-Labeled Glucose in Soil in Relation to Amendment with Organic Materials

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The effects of Cu on the mineralization of ^<14>C-labeled glucose in soil and the incorporation of ^<14>C into the soil microbial biomass were investigated in a laboratory experiment in relation to the amendment with organic materials. Samples from a Brown Lowland soil(Udifluvent), which was amended with farmyard manure or orchard grass at the rate of 20 g kg^<-1> soil and/or enriched with 2, 000 mg kg^<-1> soil of Cu, were incubated for 14 weeks under field conditions. The amounts of microbial biomass C and biomass ninhydrin-N in the field-incubated soils were significantly reduced by the addition of Cu regardless of the amendment with organic materials. The field-incubated soils to which ^<14>C-labeled glucose was added were incubated for 28 d at 25℃ in the laboratory. While the Cu added to soil did not affect appreciably the mineralization of ^<14>C-labeled glucose, the amendment with organic materials affected considerably the pattern of mineralization. On the other hand, the incorporation of ^<14>C into the soil microbial biomass wsa significantly inhibited by Cu addition. The inhibitory effect of Cu on the incorporation of ^<14>C was reduced by the amendment with organic materials, especially by the orchard grass amendment.
社団法人日本土壌肥料学会の論文