The contribution of microbial biomass N to available soil N in heated soils
1995
Shimamoto, M. (Chiba Univ., Matsudo (Japan). Faculty of Horticulture) | Sakamoto, K. | Yoshida, T.
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 15N-labelled technique. The soils used were Dark red soils and Andosols collected from Chiba prefecture. After labelling the microbial biomass N with 15N, the soils were heated (50, 100, 150 degrees C) and fumigated. The mineralized N and 15N 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 15N abundance of the N mineralized from the heated soil decreased with it. The 156N abundance of the N mineralized from the heated soil at 50 degrees C and from the fumigated soil was approximately equal to that of the 15N-labelled microbial biomass. Based on these results, we suggest that the N mineralized from the heated soil at 50 degrees C is mainly derived from the microbial biomass N, and that the ratio of the contribution of non-biomass N to the mineralized N increase with the temperature of heating treatment
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