{"_buckets": {"deposit": "7b3e55d0-198d-46f3-a71d-f1986129fa88"}, "_deposit": {"id": "2002867", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "2002867"}, "status": "published"}, "_oai": {"id": "oai:u-ryukyu.repo.nii.ac.jp:02002867", "sets": ["1642837917528", "1642838407312"]}, "author_link": [], "item_1617186331708": {"attribute_name": "Title", "attribute_value_mlt": [{"subitem_1551255647225": "土壌の酸化還元電位と鉄・マンガン溶出に及ぼす海水の影響(生産環境学科)", "subitem_1551255648112": "ja"}, {"subitem_1551255647225": "Changes of Redox Potential and Solubilization of Iron and Manganese in Soils Flooded with Seawater (Department of Environmental Sciences 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": "藪押, 建治", "creatorNameLang": "ja"}]}, {"creatorNames": [{"creatorName": "渡嘉敷, 義浩", "creatorNameLang": "ja"}]}, {"creatorNames": [{"creatorName": "志茂, 守孝", "creatorNameLang": "ja"}]}, {"creatorNames": [{"creatorName": "Oya, Kazuhiro", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Yabuoshi, Kennji", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Tokashiki, Yoshihiro", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Shimo, Moritaka", "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": "海水の影響を受けるマングローブ生育地の土壌においては,淡水により湛水される場合とは異なる化学的現象を呈することが予想されるので,マングローブ土壌の理化学性研究に資するため,酸性の赤色土と石灰質アルカリ性の灰色台地土を,蒸留水,50%及び100%海水で湛水し,その時のEh及びpHの変化並びにEhやpHに影響される鉄,マンガンの溶出について調べた。先ず赤色土については海水湛水によりpH低下が予想されたので,蒸留水,50%海水,100%海水で炭カル添加による緩衝曲線を得た。50%及び100%海水を用いると,中和緩衝曲線は1規定塩化カリ液を用いた緩衝曲線に近くなることが認められた。この緩衝曲線から求められる炭カル量を赤色土に加え,予めpH4.5,5.5になるように調整してから,海水湛水実験を行った。赤色土を蒸留水で湛水すると,土壌pH調整の有無に関係なくEhは速やかに低下し,それにともなってpHは徐々に上昇する傾向を示した。しかし海水で湛水すると,pH調整をしなかった土壌ではEh低下が遅れ,pHは低めに推移した。鉄とマンガンは蒸留水で湛水するより海水で湛水する方が溶出量は多くなった。これは海水が土壌pHを低めに保つ効果によると考えられた。灰色台地土においては,蒸留水で湛水すると,この土壌が石灰質アルカリ性であり,また有機物が少ないこともあってEhは0mV以下には下がらず,pHは8.5から7.5程度に低下する傾向がみられた。鉄は蒸留水,海水いずれによる湛水でも溶出はみられなかった。マンガンは蒸留水湛水では溶出がなかったものの,海水による湛水ではマンガンがかなり溶出する特徴が認められた。以上より海水の影響を受ける土壌では,湛水時のEhとpHの変化,並びに鉄やマンガンの溶出が,淡水のみの場合とはかなり異なる傾向にあると推定された。", "subitem_description_type": "Other"}, {"subitem_description": "Soil chemistry studies on the seawater affected soil are necessary to establish rational measures for silviculure and conservation of mangroves. In this connection, an experiment was carried out in order to study such chemical phenomena as Eh, pH and solubilization of iron and manganese in the soil brought into the flooded conditions with seawater. A Red soil (pH 4.4) and a calcareous Gray Upland soil (pH 8.4) were flooded with distilled water and 50% and 100% seawaters in polyethylene pots for about 90 days. The Red soil showed a rapid decrease in Eh below O mV, that was accompanied by a gradual rise of pH, when flooded with distilled water. In contrast, the decrease of Eh and the rise of pH were delayed when flooded with the seawaters. This seawater effect, however, was lessened in the Red soil that was previously treated with calcium carbonate to raise its pH to 5.5. Solubilization of iron and manganese was enhanced by the folooding with the seawaters in the Red soil. In the Gray Upland soil, the Eh values decreased to 25 mv at most but not below O mv by the flooding with any of the waters for the period of experimet. The pH values rather decreased slighly to 7.5. Iron was not solubilized to any extent by the flooding treatments. Manganese solubilization was brought about by flooding specifically with the seawaters. From the above, it was deemed that the changes in Eh and pH of the soil flooded under the seawater affected conditions may be different from that in the soil flooded with the freshwater.", "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/20.500.12000/3838"}]}, "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": "1991-12-04", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "38", "bibliographicPageEnd": "210", "bibliographicPageStart": "203"}]}, "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", "download_preview_message": "", "file_order": 0, "filename": "KJ00000161668.pdf", "future_date_message": "", "is_thumbnail": false, "mimetype": "", "size": 0, "url": {"objectType": "fulltext", "url": "https://u-ryukyu.repo.nii.ac.jp/record/2002867/files/KJ00000161668.pdf"}, "version_id": "36a1f961-f1a5-49d9-a997-61f173ec6f30"}]}, "item_title": "土壌の酸化還元電位と鉄・マンガン溶出に及ぼす海水の影響(生産環境学科)", "item_type_id": "15", "owner": "1", "path": ["1642837917528", "1642838407312"], "permalink_uri": "http://hdl.handle.net/20.500.12000/3838", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2008-02-14"}, "publish_date": "2008-02-14", "publish_status": "0", "recid": "2002867", "relation": {}, "relation_version_is_last": true, "title": ["土壌の酸化還元電位と鉄・マンガン溶出に及ぼす海水の影響(生産環境学科)"], "weko_shared_id": -1}