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  1. 紀要論文
  2. 琉球大学農学部学術報告
  3. 19号
  1. 部局別インデックス
  2. 農学部

沖縄に生育する有用広葉樹の重量生長に関する研究 III : タイワンハンノキおよびモクマオウの原料材としての利用率(林学科)

http://hdl.handle.net/20.500.12000/4482
http://hdl.handle.net/20.500.12000/4482
9a046667-74f5-4ca0-8fbd-a8bebc3eca36
名前 / ファイル ライセンス アクション
KJ00000162424.pdf KJ00000162424.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2008-02-14
タイトル
タイトル 沖縄に生育する有用広葉樹の重量生長に関する研究 III : タイワンハンノキおよびモクマオウの原料材としての利用率(林学科)
言語 ja
作成者 平田, 永二

× 平田, 永二

ja 平田, 永二

砂川, 季昭

× 砂川, 季昭

ja 砂川, 季昭

Hirata, Eiji

× Hirata, Eiji

en Hirata, Eiji

Sunakawa, Sueaki

× Sunakawa, Sueaki

en Sunakawa, Sueaki

アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
内容記述
内容記述タイプ Other
内容記述 本稿では, タイワンハンノキおよびモクマオウの原料材(パルプ材)としての利用率を材積および重量の両面から検討するとともに規格法によるパルプ材材積と実材積(スマリアン法)の比較を試みた。その結果をまとめるとおよそつぎのとおりである。1.材積の利用率は, 胸高直径に対して2次曲線で表われ, タイワンハンノキは直径およそ17cm, モクマオウ15cmの時最大となる。材積の利用率が1つの最大値を有するものであるかどうかは今後の研究にまたねばならないが, タイワンハンノキは直径17cmで88.7%, モクマオウは15cmで79.3%にも達しているので, それ以後の増加にはあまり期待できない。2.重量の利用率は両樹種とも直径16cmの時最大(94.1%)となる。3.重量の利用率は, 胸高直径のほか, 利用高, 利用高比, 幹材積および材積の利用率とも密接な関係を示し, いずれの因子からも推定可能である。4.実材積(スマリアン法)に対する規格法材積(日本農林規格法)の比率は, ・タイワンハンノキ94%, モクマオウ90%となり, パルプ材材積は過小に評価されることになる。また未口自乗法(0.1cm単位で計算)による材積は実材積に対して過大な値をとる。
内容記述タイプ Other
内容記述 This research was done in order to study the utilization factor of Taiwanhannoki (Alnus formosana Makino) and Mokumao (Casuarina equisetifolia Forst.) for pulpwood, from the viewpoints of volume and weight. Incidentally, it also tried to compare the differences of the volume of pulpwood by Japan Agriculture and Forestry Specifications method and its by the Smalian method. The results of the reseach are as follows : 1) The utilization factor of Taiwanhannoki reach 88.7% when the diameter at breast height is 17cm and the utilization factor of Mokumao show 79.3% when it get 15cm. Therefore, any further increase of its utilization factor cannot be expected judging from the result of the present research, though a further study is needed to ascertain whether the utilization factor has its maximum value or not. 2) The utilization factor of the weight of both the species reach their maximum when they get 16cm in diameter. 3) The utilization factor of the weight has a close relation to the effective height, the effective height ratio, the stem volume and the utilization factor of volume as well as to the diameter at breast height. Therefore, it may be estimated from each factor. 4) The ratio of the volume by Japan Agriculture and Forestry Specifications method to the Smalian method is 94% for Taiwanhannoki, 90% for Mokumao. Therefore, the volume of pulpwood measured by Japan Agriculture and Forestry Specifications method is underrated in comparison with the volume dy Smalian method. The volume measured by the so-called Sueguchijijoho (the square of top-end diameter multiplied by length) is overrated in comparison with the volume by the Smalian method.
内容記述タイプ Other
内容記述 紀要論文
出版者
言語 ja
出版者 琉球大学農学部
言語
言語 jpn
資源タイプ
資源タイプ departmental bulletin paper
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
識別子
識別子 http://hdl.handle.net/20.500.12000/4482
識別子タイプ HDL
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0370-4246
収録物識別子タイプ NCID
収録物識別子 AN00250548
収録物名
言語 ja
収録物名 琉球大学農学部学術報告
書誌情報
号 19, p. 571-590
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