北海道の針葉樹人工林における根圏効果

概要

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For further understanding of rhizosphere effects in the forest soil, chemical properties, nitrogen mineralization and soil enzyme activities were compared between rhizosphere soil and non-rhizosphere soil. Study sites were manmade forests of Abies sachalinensis and Picea jezoensis in the Tokyo University Forest in Hokkaido. Soil pH of rhizosphere was lower than that of non-rhizosphere soil. The contents of carbon, nitrogen and inorganic nitrogen of the rhizosphere soils were higher than those of the non-rhizosphere soils. Nitrogen mineralization potential(amount of rapidly and moderately decomposable organic nitrogen) and nitrogen mineralization activity of rhizosphere soils were higher than those of non-rhizosphere soil. From the relationship between the amount of nitrogen mineralization potential and nitrogen mineralization activity, it was suggested that the activity of microbes playing roles in nitrogen mineralization was higher in the rhizosphere soils than in the non-rhizosphere soils. Nitrification activity of rhizosphere soils was lower than that of non-rhizosphere soils. The lower pH of the rhizosphere soils seemed to affect the lower nitrification activity. Soil enzyme activities (protease, cellulase and acid phosphatase) of the rhizosphere soils were higher than those of non-rhizosphere soils. Rhizosphere effects differed neither in species nor sampling months.
社団法人日本土壌肥料学会の論文
2000-12-05