Microbial ecology and their carbon-cycle in mineral particles from the viewpoint of <14>^C dating

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  • 土壌および河原に分布する鉱物粒子内部の微生物の生態と有機物の年代

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^<14>C dating of the organic substance in mineral particles was performed. The particles were collected from the soil microaggregates distributed over the river-beach of Hirosegawa in Sendai, Japan. The particles are inhabited by 10^5 (direct count), or 10-10^3 (plate count) cells of diverse microorganisms. The microorganisms have been thought to survive in the particles without remarkable growth or activity, and occasionally they are ejected from the particles and some strains of them begin to growth if the condition outside the particles is suitable for the organisms. The particles seem to become partial closed system, and the carbon exchange seems rarely occur. The age was determined as 17,100±60 BP. This age is remarkably old compared with other soil organics, of which ages are scarcely older than 10,000 BP. This result reveals that at least a portion of organics have been reserved for a long term in the particles, and supports the idea that the soil microorganisms can survive in the particles for a long term and that the particles can store diverse microorganisms.

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