Seasonal and annual changes of forest soil hardness at a logging site.

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  • 伐出作業跡地の土壌支持力の季節変化と経年変化
  • バッシュツサギョウ アトチ ノ ドジョウ シジリョク ノ キセツ ヘンカ ト ケイ ネンヘンカ

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Abstract

The cone index of the forest floor, and possible factors affecting it, including precipitation and soil moisture content, were measured in a clear-cut area for nine months from May 1998 to January 1999, and again in December 1999, to examine the effects of logging operations on forest soil hardness. The cone index of the forest soil in a timber yard used 5 years earlier remains high. The cone index of the forest floor after logging increased with decreasing soil moisture content due to soil dryness. The cone index of the forest soil remained between 2.0 to 3.0 kgf/cm^2. Performing logging operations during winter, when the soil moisture content is low, can reduce soil compaction. Forestry machines used during the rainy season should be designed to exert a ground contact pressure of less than 1.5kgf/cm^2.

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