{"created":"2023-05-15T14:46:00.799979+00:00","id":923,"links":{},"metadata":{"_buckets":{"deposit":"83e8f3b9-2fea-4060-b469-3ae2d1fa7ae3"},"_deposit":{"created_by":3,"id":"923","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"923"},"status":"published"},"_oai":{"id":"oai:rekihaku.repo.nii.ac.jp:00000923","sets":["21:110"]},"author_link":["2545","2546","2547","2548","2549","2550"],"control_number":"923","item_10002_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1999-03-31","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"386","bibliographicPageStart":"371","bibliographicVolumeNumber":"81","bibliographic_titles":[{"bibliographic_title":"国立歴史民俗博物館研究報告","bibliographic_titleLang":"ja"},{"bibliographic_title":"Bulletin of the National Museum of Japanese History","bibliographic_titleLang":"en"}]}]},"item_10002_description_19":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_10002_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"本研究ではテフラやＣ-14年代を含む地質層序と花粉分析や珪藻分析による古環境のデータなどに基づいて更新世末期～完新世にかけての後志利別川流域低地における環境変遷を明らかにした。\n同低地を構成する沖積層は下部の寧土井層と上部の今金層に大きく二分され，層厚が40ｍ以上にも達し，河成段丘を深く下刻した谷に堆積する。下部の寧土井層は５ｍの層厚の沖積層基底礫層を基底にして約16,000～18,000yrs.B.P.の年代を示す泥炭層，最上部に約11,000～16,000yrs.B.P.の年代を示す有機質シルトとシルト質砂などの堆積物で構成されている。さらに、寧土井層の最上部を浅く削り込んで今金層が不整合に堆積する。今金層は上部層と下部層に細分され，本層の基底には完新世基底礫層（ＨＢＧ）に対比される約10,000～11,000yrs.B.P.の年代を示す砂礫層が認められる。この短期間で活発な河成作用は年代としてヤンガードリアス事件に対応するものと推定される。\n有楽町（縄文）海進は後志利別川下流低地まで侵入し，今金層下部層の海成層を形成する一方，中流低地に向かって河成に堆積環境が変化する。今金層上部層は主に現在～4,000yrs.B.P.の年代を示す河成の砂や礫から成る堆積物で構成されている。\n環境変遷の概要は以下の通りである。\n（1）寧土井層下部の泥炭層はカラマツ属やマツ属単維管束亜属が高率で産出する亜寒帯針葉樹林帯で特徴づけられる。また，この層位は最終氷期最寒冷期に相当する。\n（2）寧土井層上部の有機質シルトとシルト質砂の下部の有機質シルトはカバノキ属やハンノキ属を主に産出する先駆的植生，上部はカバノキ属やクルミ属林の植生を示す花粉化石を産出する。\n（3）海成シルトからなる今金層下部層はコナラ亜属優占の冷温帯落葉広葉樹林の植生を示す。\n以上のような後志利別川流域低地における更新世末期～完新世の環境変遷は東京―中川低地における同時期の環境変遷（Endo et al.,1982）と調和的である。","subitem_description_type":"Abstract"},{"subitem_description":"This paper discusses environmental changes in the Shiribeshi-Toshibetsugawa Lowland, South Hokkaido. In this lowland, stratigraphical studies including tephras and C-14 dates, and paleoenvironmental studies of pollen and diatom analyses clarified environmental changes from the latest Pleistocene to the Holocene (Suzuki,1993).\nIn the geologic profile along the Shiribeshi-Toshibetsugawa Lowland, valley fill deposits consisting of the Netoi and the Imakane Formations were more than 40 meters thick, and filled the deep valley undercutting river terraces.\nThe lower valley fill (the Netoi Formation) has the basal gravel (BG) of 5 meters in thickness. A peat layer with radiocarbon ages of about 16,000-18,000 yrs. B.P. covers BG. Upper part of the Netoi Formation cosisits of organic silt and silty sand, and is dated at about 11,000-16,000 yrs. B.P.\nAfter eroding the upper part of the Netoi Formation, the Imakane Formation deposited with unconformity. The Imakane Formation is subdivided into the upper and the lower units and has basal gravel at its base, corresponding to the basal gravel of the Holocene (HBG : ca,10,000-11,000 yrs. B.P.). This short period characterized by active fluviation corresponds to the Younger Dryas Event in age.\nThe Yurakucho (Jomon) transgression invaded into the lower reaches of the Shiribeshi-Toshibetsugawa Lowland to form the marine portion of the lower unit of the Imakane Formation, whose sedimentary environment changed to a fluvial one toward the middle reaches. The upper unit of the Imakane Formation is mainly fluvial sand and gravel deposit, and its age from 4,000 yrs. B.P. to present.\nOutline of the environmental change is as follows,\n(1)The peat layer of the lower Netoi Formation is characterized by subarctic coniferous forest with high percentages of Larix and Pinus subgen. Haploxylon. This horizon is corresponds to the coldest phase of the last glaciation.\n(2)The upper Netoi Formation, composed of organic silt and silty sand, is characterized by transitional vegetation with high percentages of Alnus and Betula in the lower Upper part and by cool-temperate deciduous broad-leaved forests with an increase of Juglans and Betula in the upper Upper part.\n(3)The lower Imakane Formation, composed of marine silt is characterized by cool-temperate deciduous broad-leaved forests with increase of Quercus subgen. Lepidobalanus and Alnus.\nThe environmental changes during the latest Pleistocene and the Holocene in the Shiribeshi-Toshibetsugawa Lowland is similar to those of the Tokyo-Nakagwa Lowlands (Endo et al., 1982).","subitem_description_type":"Abstract"}]},"item_10002_heading_23":{"attribute_name":"見出し","attribute_value_mlt":[{"subitem_heading_banner_headline":"[歴博国際シンポジウム] 過去1万年間の陸域環境の変遷と自然災害史―","subitem_heading_language":"ja"},{"subitem_heading_banner_headline":"[REKIHAKU International Symposium] Terrestrial Environmental Changes and Natural Disasters during the Last 10,000 Years","subitem_heading_language":"en"}]},"item_10002_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15024/00000906","subitem_identifier_reg_type":"JaLC"}]},"item_10002_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"国立歴史民俗博物館","subitem_publisher_language":"ja"}]},"item_10002_relation_17":{"attribute_name":"関連サイト","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"第81集 収録論文 タイトルリスト"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://www.rekihaku.ac.jp/outline/publication/ronbun/ronbun4/index.html#no81","subitem_relation_type_select":"URI"}}]},"item_10002_source_id_11":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00377607","subitem_source_identifier_type":"NCID"}]},"item_10002_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0286-7400","subitem_source_identifier_type":"PISSN"}]},"item_10002_version_type_20":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"鈴木, 正章","creatorNameLang":"ja"},{"creatorName":"スズキ, マサアキ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"吉川, 昌伸","creatorNameLang":"ja"},{"creatorName":"ヨシカワ, マサノブ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"村田, 泰輔","creatorNameLang":"ja"},{"creatorName":"ムラタ, タイスケ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Suzuki, Masaaki","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Yoshikawa, Masanobu","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Murata, Taisuke","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-04-01"}],"displaytype":"detail","filename":"kenkyuhokoku_081_25.pdf","filesize":[{"value":"1.8 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"kenkyuhokoku_081_25.pdf","url":"https://rekihaku.repo.nii.ac.jp/record/923/files/kenkyuhokoku_081_25.pdf"},"version_id":"4ab75b19-6e5c-45bb-9037-fe3b122d9490"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"後志利別川流域低地における更新世末期以降の環境変遷（日本列島と周辺域における環境変遷）","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"後志利別川流域低地における更新世末期以降の環境変遷（日本列島と周辺域における環境変遷）","subitem_title_language":"ja"},{"subitem_title":"Environmental Changes in the Shiribeshi-Toshibetsugawa Lowland Hokkaido, Japan since the Latest Pleistocene（Environment and Human Activities in the Island Arc）","subitem_title_language":"en"}]},"item_type_id":"10002","owner":"3","path":["110"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2016-04-01"},"publish_date":"2016-04-01","publish_status":"0","recid":"923","relation_version_is_last":true,"title":["後志利別川流域低地における更新世末期以降の環境変遷（日本列島と周辺域における環境変遷）"],"weko_creator_id":"3","weko_shared_id":-1},"updated":"2023-08-28T05:19:28.977809+00:00"}