各種土壌のサッカラーゼ活性と土壌有機物の量および質との関係

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タイトル別名
  • Relationship between Saccharase Activity and Quantity and Quality of Soil Organic Matter in Various Soils
  • カクシュ ドジョウ ノ サッカラーゼ カッセイ ト ドジョウ ユウキブツ ノ

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抄録

Fifty soil samples were collected from manured plots and unmanured plots of long term experimental farms at 25 Agricultural Experiment Stations and measured for saccharase activity by the method of Hofmann and Scheffer. When expressed on the basis of unit weight of dry soil, saccharase activity of volcanic ash soils is higher than that of non-volcanic ash soils. There is a significant correlation between saccharase activity and content of organic matter of the soil. However, the volcanic ash soils have lower saccharase activity value, when the value is expressed on the basis of unit weight of soil organic matter, than that of the non-volcanic ash soils. This suggests that quality as well as quantity of soil organic matter influences the saccharase activity level. Δlog k of NaOH-soluble soil organic matter is considered to be an appropriate index of humification-degree of soil organic matter. The soils are classified into two groups according to the value of Δlog k : 0.7 is regarded as a critical value of Δlog k. Correlation between saccharase activity and soil organic matter content - especially content of the easily decomposable organic matter - is evident for the soils with low Δlog k but not evident for the soils with high Δlog k. Increase in saccharase activity by manuring is highly correlated with increase in organic matter content by manuring for the soils with high Δlog k and low saccharase activity. On the contrary, this correlation is not recognized for soils with low Δlog k and high saccharase activity. A general feature of the changes in saccharase activity by manuring can be shown by a saccharase activity - Δlog k diagram. In this figure, a vector from an unmanured plot to manured plot at each Agricultural Experiment Station represents the change in saccharase activity by manuring in the field. Then, every vector points to two common small regions in this figure : the vectors belonging to the soil group with low Δlog k point to one small region and the vectors belonging to the soil group with high Δlog k point to the other small region.

収録刊行物

  • ペドロジスト

    ペドロジスト 26 (1), 2-14, 1982-06-30

    日本ペドロジー学会

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