熱乾処理土壌における地力N発現に対する微生物バイオマスNの寄与

概要

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We carried out an experiment to investigate the contribution of microbial biomass N to soil N which was made available by soil heating treatment, and was analyzed by an ^<15>N-labelled technique. The soils used were Dark red soils and Andosols collected from Chiba prefecture. After labelling the microbial biomass N with ^<15>N, the soils were heated (50,100,150℃) and fumigated. The mineralized N and ^<15>N were measured at 0,10,and 20 days after incubation. In both soils, the amount of N mineralized from the heated soil increased with the increase in the temperature of heating treatment. However, the ^<15>N abundance of the N mineralized from the heated soil decreased with it. The ^<15>N abundance of the N mineralized from the heated soil at 50℃ and from the fumigated soil was approximately equal to that of the ^<15>N-labelled microbial biomass. Based on these results, we suggest that the N mineralized from the heated soil at 50℃ is mainly derived from the microbial biomass N, and that the ratio of the contribution of non-biomass N to the mineralized N increases with the temperature of heating treatment.
社団法人日本土壌肥料学会の論文
1995-02-05