Changes in Physical Properties of Soil after Clearcutting of Japanese Cypress.

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  • Ono H.
    Faculty of Agriculture,Shinshu University

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  • ヒノキ林皆伐後の土壌の物理性変化
  • ヒノキリン カイバツゴ ノ ドジョウ ノ ブツリセイ ヘンカ

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Abstract

The relationship between the destruction of aggregate structure and changes in soil physical properties such as pore size distribution and permeability after clearcutting was examined. Soil samples were taken from a clearcut area of Japanese cypress (Chamaecyparis obtusa Endl.) 13 years after clearcutting. Soil physical properties were measured and water-stable aggregates were analyzed by the wet-sieving method. After clearcutting, the soil structure changed in A or Al horizons, and the aggregate diameter became smaller with the destruction of aggregate structure. This changed the soil pore composition, namely large pores decreased and fine pores increased, consequently reducing permeability. In A-B horizons, although the soil structures changed, the pore size distributions and permeabil-ity remained unchanged. In B horizons, no changes were found in soil structure, pore size distributions or permeability. In conclusion, in top soil such as A or Al horizons, the changes in soil pore composition and permeability after clearcutting were closely related to the changes in soil structure and destruction of aggregate structure.

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