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Title: 森林の動態に関する研究 (I) : 北海道演習林の天然林について
Other Titles: Studies on dynamics of natural forest (1) : cases of Kyoto University Forest in Hokkaido
Authors: 和田, 茂彦  KAKEN_name
竹内, 典之  KAKEN_name
川村, 誠  KAKEN_name
酒井, 徹朗  KAKEN_name
山田, 容三  KAKEN_name
Author's alias: Wada, Shigehiko
Takeuchi, Michiyuki
Kawamura, Makoto
Sakai, Tetsuro
Yamada, Yozou
Issue Date: 2-Dec-1988
Publisher: 京都大学農学部附属演習林
Journal title: 京都大学農学部演習林報告
Volume: 60
Start page: 91
End page: 110
Abstract: 測定期間中の林分構造の推移をみると, 樹種構成の点で, 出現樹種に特に顕著な変化はないが, 各プロットともトドマツの材積比率が上昇した。胸高直径階別の本数頻度分布は図2 - 5に示すとおりである。これらの分布は, 連続的で一様な分布とみるには径級相互の凹凸や切れ目が著しく, ギャップに富んだ分布である。直径分布は総数において, 30cm階層以上では本数の増加, それ以下では減少の傾向があり, その推移は径級間に異なった動きがある。この間の幹材積の成長率は時期的な成長の差があり, 75-80年にかけての成長が80-87年のそれに比し高い。またトドマツの成長が高く, 林分全体の成長を支えている。逆に下層を構成する樹種群の成長が低い。径級別では48-58cm前後の成長率が高い。また枯損と進界についてみると表6 - 8に示したように, その動きはきわめて緩慢である。しかし, 直径階ごとの進級木の動きについてみると, 表10のトドマツが例を示すように, 小径木と中・大径木とでは大きな差があり, 中大径木の進級が著しい。
We have been investigating actual conditions of a natural forest at Hokkaido from 1975, and surveyed permanent plots which set up in Shiranuka area of Kyoto university forest. Changes of forest composition during a measurement are as follows: Species which appeared in each plot were not changed. A frequency distribution of D.B.H., shown as Fig.2-Fig.5, is not uniform and continuous. They have some gap. In total number of trees, a number of trees above 30 cm increase but a number of trees under 30 cm decrease. The change is difference between each diameter class. A ratio of volume growth is difference between a term of 1975-1980 and a term of 1980-1987. The latter is higher than the former. The ratio of Abies sachalinensis Mast. is highest in all species and contributes to an increase of total volume. The ratio of species which compose undergrowth is low. The ratio of a diameter class 48-58 cm is highest. Movements of mortality and growth which is shown in Table 6-8, is slowly. But in large diameter class, that is rapidly. The movement is difference between small diameter class and middle or large diameter class.
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