The relationships between the amounts of foliage biomass, clear lengths and the vertical distributions of the annual growth along the stems of Japanese larch (<I>Larix leptolepis</I> GORD. )

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  • カラマツ樹幹における連年成長量の垂直的分布と葉量,枝下高との関係
  • カラマツ ジュカン ニ オケル レンネン セイチョウリョウ ノ スイチョクテキ

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Abstract

A stem analysis of Japanese larch (Larix leptolepis GoRD.) sample trees was made to measure the vertical distributions of the annual volume growth and basal area growth along the stems. The curve between the amount of annual volume growth and the stem volume along the bole was nearly linear, and the same result was obtained with the basal area growth. The two regression coefficients, an Lvi for the annual volume growth and an Lgi for the annual basal area growth, were determined. 1) It was considered that these two coefficients represented the vertical distribution of the annual growth along the stem. 2) Using the Lvi and Lgi, it was possible to analyze the annual growth patterns varying mainly with such conditions of the trees as the amounts of biomass, clear lengths, and the ratios of clear lengths and volume production efficiencies of unit foliage biomasses in every growing stage. 3) It was considered that there was the possibility of changes in vertical distribution patterns of annual growth along the stem by siLvicultural practices.

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