今須林業の経営環境と択伐林分の構造に関する調査報告

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  • 今須林業の経営環境と択伐林分の構造に関する調査報告(林学部門)
  • イマ ス リンギョウ ノ ケイエイ カンキョウ ト タクバツ リンブン ノ コ
  • A report on environmental conditions of forestry and structures of selection forest stands in Imasu district of Gifu Prefecture (Forestry)

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Abstract

The forestry in Imasu district of Gifu Prefecture has been generally known by the intensive management with a selection forest system since about 100 years. The author researched the environmental conditions of this forestry and the structures of the selection forest stands in this district. 1) The forest land of about 2200 hectares is divided into a large number of pieces of small areas and owned among about 270 farmer families in the district. The area a family is therefore less than 10 hectares. To keep the sustained yield of timber from a limitted area of forest, the farmers have naturally introduced the selection forest system into the management of their forests. This is also the system suitable to be worked by the farmer family labor, and in the Imasu forestry, all the works, from plantation to timber sawing, are performed by the inhabitants of the district. 2) The area worked by the selection forest system is about 770 hectares, covering about 36 percent of the total forest area in the district. The selection forest stands are distributed to locations conveniently situated, less than 400 metres above the sea. 3) In Imasu district, there are found various types of selection forest stands, from the typical selection type to the one nearly uniformed. On the basis of the results of the researches of the stand structures on the three sample plots, a stand model was proposed for the selection forest in Imasu district. That is as follows : Stand volume of principal trees : 320m^3/ha, distributed among the large, the middle and the small tree class by 50%, 30% and 20% respectively. Number of principal trees : 950/ha, its diameter distribution following the Meyer's exponential function : P(x)=0.19 Exp (-0.08x).

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