{"created":"2022-01-27T07:36:32.093201+00:00","id":2003524,"links":{},"metadata":{"_buckets":{"deposit":"bfaba277-ebf4-45fd-9a81-e1dffad68f1e"},"_deposit":{"id":"2003524","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"2003524"},"status":"published"},"_oai":{"id":"oai:u-ryukyu.repo.nii.ac.jp:02003524","sets":["1642837622505:1642837905044:1642837906897","1642838403551:1642838407312"]},"author_link":[],"item_1617186331708":{"attribute_name":"Title","attribute_value_mlt":[{"subitem_1551255647225":"沖縄に生育する有用広葉樹の重量生長に関する研究 I : オキナワシイ (Castanopsis lutchuensis Nakai) について(林学科)","subitem_1551255648112":"ja"},{"subitem_1551255647225":"Studies on the growth of weight of the useful broad-leaved species in Okinawa I : On the Okinawashii (Castanopsis lutchuensis Nakai) (Department of Forestry)","subitem_1551255648112":"en"}]},"item_1617186419668":{"attribute_name":"Creator","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"平田, 永二","creatorNameLang":"ja"}]},{"creatorNames":[{"creatorName":"砂川, 季昭","creatorNameLang":"ja"}]},{"creatorNames":[{"creatorName":"Hirata, Eiji","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Sunakawa, Sueaki","creatorNameLang":"en"}]}]},"item_1617186476635":{"attribute_name":"Access Rights","attribute_value_mlt":[{"subitem_1522299639480":"open access","subitem_1600958577026":"http://purl.org/coar/access_right/c_abf2"}]},"item_1617186626617":{"attribute_name":"Description","attribute_value_mlt":[{"subitem_description":"本調査は, 沖縄の代表的な広葉樹であるオキナワシイの重量生長を測樹学的な立場から把握し, 原料材生産林の生産技術確立のための基礎資料にする目的でおこなったものである。調査の結果を要約するとおよそつぎのとおりである。 1.単木生材重量 1)単木生材重量と胸高直径との間には次式のような関係が認められる。y=0.23121x^<2.25201>ここにy : 単木生材重量x : 皮付胸高直径この式は, 実測値とよく適合し, 相関度も高い(対数での相関係数0.993)。したがって, 胸高直径を測定することにより単木生材重量を推定することは可能であろう。2)単木生材重量と樹高の関係においては, 上層木と下層木の区分が明確にあらわれる。それらを区分する胸高直径の大きさは, 10&acd;15cmの範囲にあるものと推定される。胸高直径10cm以下の林木について両者の関係式を求めると, y=0.01094x^<3.64337>ここにy : 単木生材重量x : 樹高となり, 実測値によく適合する。3)単木生材重量と皮付幹材積とは直線的な関係があり, 相関係数は0.999で相関度がきわめて高い。回帰式は次式であたえられる。y=-0.4608+1140.9052xここにy : 単木生材重量x : 皮付幹材積すなわち, 幹材積の増加にともなって単木生材重量も増加する。以上要するに, 単木生材重量は, 胸高直径, 樹高および幹材積と密接な関係があり, いずれの測定因子からも推定が可能である。 2.単木標準比重 単木標準比重は, 胸高平均比重と最も相関度が高く, 胸高平均比重の増加にともなって増加する。また, 樹高の大きさには影響されず一定の数値をとり, 胸高直径や幹材積が増大するにつれて増大する。これらの関係を式で表わすと次のとおりである。胸高直径との関係y=0.5679+0.004286xここにy : 単木標準比重x : 胸高直径樹高との関係y=0.6048ここにy : 単木標準比重胸高平均比重との関係y=0.17963+0.70346xここにy : 単木標準比重x : 胸高平均比重幹材積との関係y=0.5876+0.4953xここにy : 単木標準比重x : 幹材積 3.単木全乾重量 1)胸高直径と単木全乾重量との関係は, 単木生材重量の場合と同様に曲線式で示すことができる。回帰式は, y=0.1071x^<2.2669>ここにy : 単木全乾重量x : 皮付胸高直径と計算され, 実測値とよく適合し, 相関度も高い(対数での相関係数0.994)ので, 胸高直径より, 単木全乾重量を推定することは可能である。2)単木全乾重量と樹高との関係は, 樹高対単木生材重量の関係に類以した傾向を示す。すなわち, 上層木と下層木の区分が明確にあらわれ, 各グループ内においては曲線的な関係が認められる。","subitem_description_type":"Other"},{"subitem_description":"胸高直径10cm以下の林木については, 次式が適用される。y=0.0054x^<3.6217>ここにy : 単木全乾重量x : 樹高3)単木全乾重量は, 単木生材重量の増加にともなって増加し, 相関係数は0.9999でほぼ完全相関となる。両者の関係は次式で与えられる。y=-0.223+0.487xここにy : 単木全乾重量x : 単木生材重量4)単木全乾重量は, 単木標準比重が増加するにつれて急激に増大する傾向を示すが, 変動が大きく相関度も低いので, 単木標準比重のみから単木全乾重量を推定することは因難であろう。5)単木全乾重量と幹材積との関係は上昇直線であらわれる。すなわち, 幹材積が増加するにしたがって単木全乾重量も増加する。この関係を数式で示すと次のとおりである。y=-0.450+555.923xここにy : 単木全乾重量x : 皮付幹材積以上要するに, 単木全乾重量は, 単木標準比重との関係を除けば, いずれの測定因子とも相関度が高く, また, これらの関係式も実測値とよく適合する。したがって, 単木標準比重を除けばいずれの測定因子からも推定が可能である。6)単木全乾重量は次式のように, 胸高直径, 樹高およびその相乗積による重回帰式で表わすことができる。y=-4.6186+0.2449D-0.2650DH+0.0345D^2H+ 1.6743Hここにy : 単木全乾重量D : 胸高直径H : 樹高 4.各種重量の関係 単木生材重量, 単木皮内全乾重量, 単木皮付全乾重量および単木皮付幹材積の胸高直径に対する変化は, お互にほぼ平行的な関係を有する。 5.全乾重量生長量 1)ha当り連年全乾重量生長量は平均4.358トンで4.898&acd;3.817トンの範囲にある。なお, 推定精度は12.40%である。2)ha当り全乾重量は34.142トンで, ha当り材積は52.79m^3である。したがって, 本林の林分標準比重は0.647t/m^3となる。3)全乾重量の生長率は12.76%で, 材積の生長率12.18%をわずかにうわまわる。4)単木当り連年材積生長量と連年全乾重量生長量の胸高直径に対する変化は, ほぼ平行的な関係を示す。","subitem_description_type":"Other"},{"subitem_description":"The study was done in order to grasp the growth of dry weight of Okinawashii which is representative species of borad-leaved species in Okinawa, from the view point of the forest measurement. The obtained data from the results of the study will be useful for the establishment of production technique in the forest for production of timber for raw material. The results of the study are as follows : 1. Green Weight of Stem with Bark 1) The relation of the diameter at breast height to the green weight of stem is expressed by y=0.23121x^<2.25201> where x : diameter at breast height y : green weight of stem with bark This equation is in conformity with the actual measurements, and the green weight has a high correlation with the diameter at breast height (the coefficient of correlation expressed in logarithm is 0.993). Namely, it is possible to estimate the green weight of a tree from the diameter at breast height. 2) In the relation between the green weight of a tree and the tree height, the division of the main tree-crop and the dominanted tree is observed clearly. The size of diameter which divide the main tree-crop and the dominated tree is estimated to be from 10cm to 15cm. For the trees which have less than 10cm in diameter at breast height, the relation between the green weight of a tree and the tree height is expressed by y=0.01094x^<3.64337> where x : tree height y : green weight of a tree This equation is in conformity with the actual measurements. 3) The green weight of a tree is expressed by a linear regression equation of the volume with bark, and the correlation is very high as seen from 0.999 of the coefficient of correlation. The regression equation is y=-0.4608+1140.9052x where x : volume with bark y : green weight of a tree Namely, the green weight of a tree increases with the increase of the volume with bark. From the above results, the green weight of a tree is closely related to the diameter at breast height, the tree height and the volume with bark, and it is said that it is possible to estimate the green weight of a tree from the above each measurement factor.","subitem_description_type":"Other"},{"subitem_description":"2. Mean Specific Gravity The mean specific gravity has a high correlation with the average specific gravity at breast height, and it increases with the increase of the average specific gravity at breast height. And the mean specific gravity is almost constant in spite of the increase of the tree height, but it increases with the increase of the volume with bark and the diameter at breast height. They are given in equations as follows : for the relation with the diameter at breast height y=0.5677+0.004286x where y : mean specific gravity x : diameter at breast height for the relation with the tree height y=0.6048 where y : mean specific gravity for the relation with the average specific gravity at breast height y=0.17963+0.70346x where y : mean specific gravity x : average specific gravity at breast height for the relation with the volume with bark y=0.5876+0.4953x where y : mean specific gravity x : volume with bark 3. Dry Weight of Stem without Bark 1) The relationship between the dry weight of stem and the diameter at breast height, as in the case of the green weight of a tree, is expressed by a curvilinear regression equation. The regression equation is calculated as follows : y=0.1071+x^<2.2669> where y : dry weight of stem without bark x : diameter at breast height This equation is in conformity with the actual measurements, and the dry weight of stem has a high correlation with the diameter at breast height (the coefficient of correlation expressed in logarithm is 0.994). Therefore, it is possible to estimate the dry weight of stem from the diameter at breast height. 2) The relation between the dry weight of stem and the tree height has a tendency that is similar to the relation of the green weight of stem and the tree height, that is, the division of the main tree-crop and the dominated tree is clear, and a curvilinear relation i","subitem_description_type":"Other"},{"subitem_description":"紀要論文","subitem_description_type":"Other"}]},"item_1617186643794":{"attribute_name":"Publisher","attribute_value_mlt":[{"subitem_1522300295150":"ja","subitem_1522300316516":"琉球大学農学部"}]},"item_1617186702042":{"attribute_name":"Language","attribute_value_mlt":[{"subitem_1551255818386":"jpn"}]},"item_1617186783814":{"attribute_name":"Identifier","attribute_value_mlt":[{"subitem_identifier_type":"HDL","subitem_identifier_uri":"http://hdl.handle.net/20.500.12000/4556"}]},"item_1617186920753":{"attribute_name":"Source Identifier","attribute_value_mlt":[{"subitem_1522646500366":"ISSN","subitem_1522646572813":"0370-4246"},{"subitem_1522646500366":"NCID","subitem_1522646572813":"AN00250548"}]},"item_1617186941041":{"attribute_name":"Source Title","attribute_value_mlt":[{"subitem_1522650068558":"ja","subitem_1522650091861":"琉球大学農学部学術報告"},{"subitem_1522650068558":"en","subitem_1522650091861":"The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus"}]},"item_1617187056579":{"attribute_name":"Bibliographic Information","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1969-10-01","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"16","bibliographicPageEnd":"287","bibliographicPageStart":"258"}]},"item_1617258105262":{"attribute_name":"Resource Type","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_1617265215918":{"attribute_name":"Version Type","attribute_value_mlt":[{"subitem_1522305645492":"VoR","subitem_1600292170262":"http://purl.org/coar/version/c_970fb48d4fbd8a85"}]},"item_1617605131499":{"attribute_name":"File","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","filename":"KJ00000162319.pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://u-ryukyu.repo.nii.ac.jp/record/2003524/files/KJ00000162319.pdf"},"version_id":"2123ea06-c578-4d48-8baa-288ff8d895a3"}]},"item_title":"沖縄に生育する有用広葉樹の重量生長に関する研究 I : オキナワシイ (Castanopsis lutchuensis Nakai) について(林学科)","item_type_id":"15","owner":"1","path":["1642837906897","1642838407312"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2008-02-14"},"publish_date":"2008-02-14","publish_status":"0","recid":"2003524","relation_version_is_last":true,"title":["沖縄に生育する有用広葉樹の重量生長に関する研究 I : オキナワシイ (Castanopsis lutchuensis Nakai) について(林学科)"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-10-31T01:23:49.599108+00:00"}