Turnover Time of Microbial Biomass Carbon in Japanese Upland Soils with Different Textures

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概要

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• We investigated the turnover time of microbial biomass-C in Japanese upland soils with various textures and examined the soil physicochemical properties influencing their turnover time. Samples from five different soil types (sanddune regosol, light-colored Andosol, humic Andosol, brown forest soil, and dark red soil) were taken from upland concrete-frame plots in the experimental field of Chiba University. Each soil amended with [U-^<13>C] glucose was incubated for 80 d at 25℃. Microbial biomass-C and -^<13>C in soil were periodically determined by the fumigation-extraction method. The longest turnover time of microbial biomass-C was observed in the dark red soil (215 d) followed by the humic Andosol (134 d), brown forest soil (97 d), and light-colored Andosol (83 d) and the shortest in the sand-dune regosol (45 d). The turnover time of microbial biomass-C was significantly correlated with the value of soil clay (R: 0.917), CEC (R: 0.921), and macroaggregate (R: 0.907) contents, but not with the total-C content. The amount of microbial biomass-C showed a close correlation with the turnover time of microbial biomass-C, suggesting that the turnover time of microbial biomass-C is an important factor influencing the accumulation of microbial biomass-C in soil.

• 社団法人日本土壌肥料学会の論文

著者

• Sakamoto Kazunori

  Faculty Of Horticulture Chiba University

• Hodono Naoko

  Faculty of Horticulture, Chiba University

• Hodono Naoko

  Faculty Of Horticulture Chiba University

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