@article{oai:kpu.repo.nii.ac.jp:00005184,
 author = {齋藤, 秀樹 and Saito, Hideki},
 journal = {京都府立大學學術報告. 農學, The scientific reports of Kyoto Prefectural University. Agriculture},
 month = {Nov},
 note = {落葉資料に欠けるアカマツ壮齢林(40,60,75及び85年生)で調査を行なって落葉型, 林分間での落葉の同調性, 気温と落葉期の関連などを考察した。主な結果は次の通りである。(1)落葉盛期は秋であった。秋の落葉期に二つのピークをもつ林分があった。春5月にも小ピークがみられた。(2)地域内の林分では, 林齢とは無関係に, 落葉の季節変動は同調していた。近接の林分ほど高い同調性を示した。(3)秋の落葉盛期は暖かさの指数が低い年ほど早期にあらわれた。地域間(82∿130℃・month)でも同じ傾向がみられた。(4)既往の資料を含めて落葉型を考察すると, 日本のアカマツ林は秋型である。例外として, 個体の占有面積がある限界値(0.7m^2/tree, 15,000/ha)より小さい林分では, 春の小ピークが肥大し, 生育期に盛期をもつことがある。これはアカマツの分枝, 葉の着き方, 個葉の長さなど形態上の特徴にもとずく, 狭小な空間への適応の低さに起因すると考えた。これは密度効果であり, 大畠・渡辺が指摘するマツの過去の性質の発現でもある。(5)春(生育期)の落葉が顕著な林分の年間落葉量は, 秋だけの盛期の林分に比べて多い。, Middle-aged stands (40,60,75 and 85 years old) of Japanese red pine (Pinus densiflora BLUME), age for which leaf-fall information is lacking, were studied, and seasonal patterns of leaf-fall, their sychronization among stands and the relationship between leaf-fall season and air temperature were investigated. The results were as follows. 1) The peak of leaf-fall in the studied stands occurred in autumn, and in some of them, two separate peaks were seen. A minor peak in May was also recognized. 2) Seasonal fluctuations of leaf-fall were synchronized among stands within a local area, regardless of stand age. The nearer the stands were to each other, the more marked was the synchronization. 3) The autumn peak occurred earlier in years with low Warmth Index values than in years with high values. Comparison of the present data with those for many stands (WI : 82-130℃・month) previously reported revealed that the peaks occurred earlier with decreasing Warmth Index. 4) From data on pine leaf-fall seasons reported previously, data on pine needle fall obtained by OOHATA and WATANABE and the results of this study, Japanese red pine stands in Japan were classified into the autumn type. In several stands with a high density exceeding 15,000 trees/ha or with a ground space of less than 0.7m^2/tree, expressed as the mean area occupied by a tree, the May peak expanded into the growing season and the major peak in autumn became a minor one. It was thought that expansion of the May peak resulted from poor adaptability of Japanese red pine to a small growing space, due to morphological characteristics such as branching, arragemant of needle on shoots, and needle length. This is one of the effects of density and was previously reported as a property of Pinus get in the Quaternary period by OOHATA and WATANABE. 5) Annual leaf-fall rates (mean : 5.30±1.34t/ha・yr) in 13 dense stands showing an expanded May peak or growing season were higher than those (mean : 2.96±0.96t/ha・yr) in 42 stands showing a marked autumn peak.},
 pages = {47--57},
 title = {アカマツ林の落葉の季節変動と林分間にみられる同調性(林学部門)},
 volume = {42},
 year = {1990},
 yomi = {サイトウ, ヒデキ}
}