@article{oai:iwate-u.repo.nii.ac.jp:00015688,
 author = {國崎, 貴嗣 and 白旗, 学 and 松木, 佐和子},
 issue = {6},
 journal = {日本森林学会誌, Journal of the Japanese Forest Society},
 month = {Dec},
 note = {過密なスギ若齢，壮齢林計5林分を対象に，樹冠長と直近5年間の平均胸高直径成長量との対応関係を調べた。林木の胸高直径成長がほぼ停止する胸高直径の閾値は林分で異なるのに対し，樹冠長の閾値はいずれの林分でも4.0 mとなり，樹冠長4.0 m未満の平均胸高直径成長量は0～0.04 cm/年と，全く，あるいはほとんど成長していなかった。樹冠長が4.0 m以上の林木を対象に，樹冠長から4.0 mを減じた差引き樹冠長と直近5年間の平均胸高直径成長量との関係を共分散分析で解析し，胸高直径を共変量とした共分散分析モデルと比較した。その結果，後者の自由度調整済み決定係数は前者のそれより明らかに高かった。スギ過密林での間伐木選定にあたっては，樹冠長4.0 m未満の林木を胸高直径成長停止木，樹冠長4.0 m以上の林木については胸高直径が大きいほど活力のある林木として判断すれば良いと考えられる。, The correlation between crown length and mean increment in diameter at breast height (DBH) over a period of five years was investigated in five overcrowded, young and middle-aged Sugi (Cryptomeria japonica D. Don) stands. The threshold value of DBH, at which the mean DBH increment of Sugi trees is nearly zero, differed among the stands, whereas the threshold value of crown length, at which the mean DBH increment of Sugi trees is nearly zero, was 4.0 m in all stands. For the trees with a crown length over 4.0 m, the relationship between length index (with 4.0 m subtracted from the whole crown length) and mean DBH increment was analyzed using analysis of covariance (ANCOVA), and it was compared with the ANCOVA model with DBH as a covariate. The adjusted coefficient of determination of the latter model was significantly higher than that of the former model. With respect to the selection of thinned trees in overcrowded Sugi stands, it is reasonable to assume that trees with a crown length less than 4.0 m show little to no growth and that the greater the DBH, the more vigorous the growth of the trees with a crown length of over 4.0 m.},
 pages = {401--404},
 title = {過密なスギ人工林における樹冠長と直近5年間の胸高直径成長量との関係},
 volume = {103},
 year = {2021}
}