Growth pattern analysis of pure even-aged plantations of eight deciduous broad-leaved tree species in Iwate Prefecture, northern Japan.

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  • 岩手県内に造成された落葉広葉樹8種の人工同齢単純林における林分成長特性
  • イワテ ケンナイ ニ ゾウセイサレタ ラクヨウ コウヨウジュ 8シュ ノ ジンコウ ドウレイ タンジュンリン ニ オケル リンブン セイチョウ トクセイ

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Abstract

We analyzed the growth patterns of pure even-aged plantations of eight deciduous hardwood species (Betula maximowicziana, B. platyphylla, Cercidiphyllum japonicum, Quercus serrata, Aesculus turbinata, Juglans ailanthifolia, Zelkova serrata, and Fagus crenata) in Iwate Prefecture, Japan. Three species with an excurrent crown form had a greater branch height than the other five species, which had a decurrent crown form. All plantations except F. crenata showed more vigorous height growth than natural hardwood stands in high-quality sites in Iwate Prefecture. The periodic annual volume increase in five plantations (C. japonicum, Q. serrata, A. turbinata, Z. serrata, and F. crenata) in 2004 exceeded the simultaneous mean annual volume increase. The stand volume of the Q. serrata plantation was 341 m^3/ha at a stand age of 31 years; this plantation had a larger stand volume than natural hardwood stands at high-quality sites in Iwate Prefecture. In contrast, the stand volume of the J. ailanthifolia plantation was 82 m^3/ha at a stand age of 29 years; this plantation had the same stand volume as natural hardwood stands at low-quality sites in Iwate Prefecture.

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