{"created":"2022-01-27T02:38:34.671951+00:00","id":2002780,"links":{},"metadata":{"_buckets":{"deposit":"d8584b1e-d032-46f6-88c2-e59b40b1b179"},"_deposit":{"id":"2002780","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"2002780"},"status":"published"},"_oai":{"id":"oai:u-ryukyu.repo.nii.ac.jp:02002780","sets":["1642837622505:1642837905044:1642837919297","1642838403551:1642838407312"]},"author_link":[],"item_1617186331708":{"attribute_name":"Title","attribute_value_mlt":[{"subitem_1551255647225":"西表島開墾地及び林地の土壌理化学性(生産環境学科)","subitem_1551255648112":"ja"},{"subitem_1551255647225":"Physical and Chemical Properties of the Soil in the Reclaimed Land and Forest of Iriomote Island (Department of Environmental Science and Technology)","subitem_1551255648112":"en"}]},"item_1617186419668":{"attribute_name":"Creator","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"大屋, 一弘","creatorNameLang":"ja"}]},{"creatorNames":[{"creatorName":"比嘉, 基晶","creatorNameLang":"ja"}]},{"creatorNames":[{"creatorName":"Oya, Kazuhiro","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Higa, Motoaki","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_1617186609386":{"attribute_name":"Subject","attribute_value_mlt":[{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"西表島"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"開墾地"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"土壌理化学性"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"リン酸"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"アルミナ"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Iriomote Island"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"soils after clearing forest"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"physical and chemical properties of soil"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"phosphate"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"alumina"}]},"item_1617186626617":{"attribute_name":"Description","attribute_value_mlt":[{"subitem_description":"西表島開墾地の土壌管理に資するため, 前報(Oya et al 1994)の調査の一環として, 開墾試験区土壌の可給態リン酸及び交換性アルミナを分析・測定した。また併せて開墾試験区周辺林地2カ所において, 土壌理化学性の垂直変化について調査した。(1) 開墾試験区土壌の可給態リン酸と交換性アルミナ 開墾試験区としてA区(対照区, 林地), DG区(レーキドーザーにより山成り開墾, 3年間牧草栽培後放置), DN区(同上により開墾後裸地状態で放置), EG区(ブルドーザーにより開墾均平化, 3年間牧草栽培後放置), EN区(同上により開墾後裸地状態で放置)などを1976年に設置し, 各区から開墾当初, 3年後, 15年後に表土(0∿15cm)3点づつを採取して可給態リン酸と交換性アルミナを分析・測定した。可給態リン酸はA区(林地)でも約0.5mg P_2O_5/100gと低い方であり, DG区とDN区はこれに近いレベルにあったが, EG区とEN区ではかなり低くA区の約3分の1であった。交換性アルミナはA区では0.8∿1.8me Al/100gであったが, EG区とEN区では2.7∿3.6meと著しく多い状態にあった。DG区とDN区はA区よりやや高いが, EG区やEN区より低いレベルにあった。開墾後の経年による可給態リン酸と交換性アルミナの量的変化については明確な傾向はみられなかった。(2) 林地における土壌理化学性の垂直変化 土壌養分は表層から下層へ急激に減少し, 一方で受食性の目安となる土壌の分散率は高くなった。以上より, 西表島の砂岩土壌地帯では, ブルトーザーにより下層土を露出させるような開畑を行うと, そこの土壌は肥沃度が著しく悪くなり, 同時に土壌侵食も受け易くなる恐れがあるので, その場合の土壌管理には十分意を払う必要があると考えられる。","subitem_description_type":"Other"},{"subitem_description":"Available phosphate and exchangeable Al in the soil were determined in order to refer them for better soil management measures as a part of previous in vestigation on changes in physical and chemical properties of the soil abandoned after clearing forest. In addition some of physical and chemiical properties of the forest soil near the reclamation experiment site were investigated in the vertical extension for the same purpose. The level of available phosphate in the soil was higher in the DG and DN plots that were cleared by a rakedozer than in the EG and EN plots that were cleared by a bulldozer. Exchangeable Al in the soil was higher in the EG and EN plots than in the DG and DN plots. Changes in the levels of availavle phosphate and exchangeable Al in the soil were not clearly observed for the time course of 15 years after clearing forest. The vertical examination of some of the soil's physical and chemical properties in 2 forest sites revealed that soil nutrients tended to decrease steeply from the surface to a deeper layer, but reversely dispersion rate to increase. It was deemed that intensive soil management should be practiced to control soil erosion and to improve soil fertility if the land was reclaimed from the forest by a bulldozer.","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":"eng"}]},"item_1617186783814":{"attribute_name":"Identifier","attribute_value_mlt":[{"subitem_identifier_type":"HDL","subitem_identifier_uri":"http://hdl.handle.net/20.500.12000/3751"}]},"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":"1995-12-01","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"42","bibliographicPageEnd":"116","bibliographicPageStart":"109"}]},"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":"KJ00000161782.pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://u-ryukyu.repo.nii.ac.jp/record/2002780/files/KJ00000161782.pdf"},"version_id":"ad349a13-a008-42eb-b5fb-b285b60feb4e"}]},"item_title":"西表島開墾地及び林地の土壌理化学性(生産環境学科)","item_type_id":"15","owner":"1","path":["1642837919297","1642838407312"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2008-02-14"},"publish_date":"2008-02-14","publish_status":"0","recid":"2002780","relation_version_is_last":true,"title":["西表島開墾地及び林地の土壌理化学性(生産環境学科)"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-10-31T01:08:47.730209+00:00"}