{"created":"2023-06-20T13:24:15.363640+00:00","id":5653,"links":{},"metadata":{"_buckets":{"deposit":"366a22a8-b6af-4c7d-9465-3a82c7c73dd1"},"_deposit":{"created_by":24,"id":"5653","owners":[24],"pid":{"revision_id":0,"type":"depid","value":"5653"},"status":"published"},"_oai":{"id":"oai:ir.soken.ac.jp:00005653","sets":["33:34"]},"author_link":["371","8202"],"item_2_creator_3":{"attribute_name":"著者名(英)","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"NASU, Hiroo","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_2_date_4":{"attribute_name":"発行日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2016-06-13","subitem_date_issued_type":"Created"}]},"item_2_description_13":{"attribute_name":"研究課題番号","attribute_value_mlt":[{"subitem_description":"25850009","subitem_description_type":"Other"}]},"item_2_description_14":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_2_description_16":{"attribute_name":"研究期間","attribute_value_mlt":[{"subitem_description":"2013～2015","subitem_description_type":"Other"}]},"item_2_description_17":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"研究成果の概要（和文）：\n縄文時代から現代までの水田雑草の多様性変化を、遺跡から出土する雑草種子から直接復元し、シャノンの多様度指数と個体数-種数累積曲線により評価した。その結果、古代から水田雑草の多様性が増加し、中世で最も高くなることを明らかにした。この時期の条里制水田や田植法などの農法の普及、有機肥料の導入などの中規模攪乱が多様性を最大にしたと考えられる。その後、近世から多様性が減少し、昭和期に激減したが、これは農薬の使用だけでなく、乾田化による水位の低下が大きく影響していた。ところが、平成の無農薬で営まれている谷戸田では、多様性が近世レベルまで回復していることも明らかになった。\n研究成果の概要（英文）：\nThis study examines how the flora and species diversity of rice paddy weeds have changed on the basis of differences in rice paddy management over time. We used Shannon diversity index and rarefaction curve to estimate the past weed diversity detected from archaeological weed remains.The results indicate that the weed diversity increased from Ancient period and the highest diversity was recorded at Medieval times. The new methods of paddy field management introduced from these periods probably caused the intermediate-disturbance. From the Edo period, the weed diversity decreased gradually, and it is decreased drastically from Showa period. Not only use of agricultural chemical but also the decreasing of water table is main cause of the decrease of weed diversity. The weed diversity, however, re-increasing in the small-valley paddyfield without use agricultural chemical in the Heisei period.","subitem_description_type":"Abstract"}]},"item_2_description_18":{"attribute_name":"科研費研究者番号","attribute_value_mlt":[{"subitem_description":"60390704 | https://kaken.nii.ac.jp/ja/search/?qm=60390704","subitem_description_type":"Other"}]},"item_2_description_6":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"科学研究費補助金研究成果報告書 \n研究代表者：那須浩郎［総合研究大学院大学その他の研究科助教］ ","subitem_description_type":"Other"}]},"item_2_relation_11":{"attribute_name":"関連サイト","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"KAKEN（科学研究費補助金データーベース）"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-25850009/","subitem_relation_type_select":"URI"}}]},"item_2_text_19":{"attribute_name":"研究分野","attribute_value_mlt":[{"subitem_text_value":"考古植物学、作物生産科学"}]},"item_2_text_20":{"attribute_name":"研究種目","attribute_value_mlt":[{"subitem_text_value":"若手研究(B)"}]},"item_2_text_5":{"attribute_name":"報告年度","attribute_value_mlt":[{"subitem_text_value":"2015"}]},"item_2_version_type_12":{"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":"那須, 浩郎"}],"nameIdentifiers":[{},{},{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-12-08"}],"displaytype":"simple","filename":"25850009seika_nasu.pdf","filesize":[{"value":"501.3 kB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"研究成果報告書","url":"https://ir.soken.ac.jp/record/5653/files/25850009seika_nasu.pdf"},"version_id":"b273170c-1c20-4824-8ea8-5e2c342c3d8a"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"雑草","subitem_subject_scheme":"Other"},{"subitem_subject":"多様性","subitem_subject_scheme":"Other"},{"subitem_subject":"水田","subitem_subject_scheme":"Other"},{"subitem_subject":"埋土種子","subitem_subject_scheme":"Other"},{"subitem_subject":"遺跡","subitem_subject_scheme":"Other"},{"subitem_subject":"古代","subitem_subject_scheme":"Other"},{"subitem_subject":"中世","subitem_subject_scheme":"Other"},{"subitem_subject":"中規模攪乱","subitem_subject_scheme":"Other"},{"subitem_subject":"寄生虫卵","subitem_subject_scheme":"Other"}]},"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":"research report","resourceuri":"http://purl.org/coar/resource_type/c_18ws"}]},"item_title":"古代と中世における農耕地雑草の多様性変化と人間活動の関係","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"古代と中世における農耕地雑草の多様性変化と人間活動の関係"},{"subitem_title":"Changes in species diversity of rice paddy weeds during the ancient and medieval times","subitem_title_language":"en"}]},"item_type_id":"2","owner":"24","path":["34"],"pubdate":{"attribute_name":"公開日","attribute_value":"2017-12-08"},"publish_date":"2017-12-08","publish_status":"0","recid":"5653","relation_version_is_last":true,"title":["古代と中世における農耕地雑草の多様性変化と人間活動の関係"],"weko_creator_id":"24","weko_shared_id":-1},"updated":"2023-06-20T14:35:33.014878+00:00"}