{"created":"2025-09-24T02:12:54.123031+00:00","id":2001391,"links":{},"metadata":{"_buckets":{"deposit":"d03bd5ff-729b-47e3-bd54-d264335178c2"},"_deposit":{"created_by":121,"id":"2001391","owner":"121","owners":[121],"pid":{"revision_id":0,"type":"depid","value":"2001391"},"status":"published"},"_oai":{"id":"oai:repository.naro.go.jp:02001391","sets":["1706970004180:1","87:661:1727312983899:1727312636636:1750150221744"]},"author_link":["1299","1908"],"item_12_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2010-03-31","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"73","bibliographicPageStart":"61","bibliographicVolumeNumber":"210","bibliographic_titles":[{"bibliographic_title":"農村工学研究所技報","bibliographic_titleLang":"ja"},{"bibliographic_title":"Technical report of the National Institute for Rural Engineering","bibliographic_titleLang":"en"}]}]},"item_12_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Recently, the change concerning the management situation of the paddy field like the abandonment of cultivation, the paddy-upland rotation, and the farm land consolidation, etc. is large. It is expected that a decrease in the paddy field area and these changes influence the nitrogen outflow load of the watershed as a decrease in the water quality purification ability.\n Then, causes of the change of the nitrogen concentration was examined in branch rivers of the Lake Kasumigaura in Ibaraki Prefecture. In this study, water monitoring data of 24 rivers observed by public sectors, statistical data and GIS data were analyzed. And then, to clarify the decrease in the purification function，high density synoptic observed data of nitrate-nitrogen concentration in the Hishiki River watershed that is branch in Lake Kasumigaura were analyzed.\n As a result, it became clear the following. ①The change in nitrogen concentration until middle of the 1990’s relates to the nitrogen load amount change of the non-point and point source. ②The rise of the nitrogen concentration of the irrigation period is controlled by the cyclic irrigation. ③ The increase of the amount of the nitrogen load corresponding to the rise of the concentration of nitrogen after 1997 is not observed. ④The nitrogen purification ability has decreased by the change in the condition of the paddy field such as fallow, abandonments, and rotational upland fields.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_12_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.24514/0002001391","subitem_identifier_reg_type":"JaLC"}]},"item_12_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"独立行政法人 農業・食品産業技術総合研究機構 農村工学研究所","subitem_publisher_language":"ja"},{"subitem_publisher":"National Agriculture and Food Research Organization, National Institute for Rural Engineering","subitem_publisher_language":"en"}]},"item_12_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"1882-3289","subitem_source_identifier_type":"PISSN"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"MATSUMORI, Kenji","creatorNameLang":"en"},{"creatorName":"松森, 堅治","creatorNameLang":"ja"},{"creatorName":"マツモリ, ケンジ","creatorNameLang":"ja-Kana"}],"familyNames":[{"familyName":"MATSUMORI","familyNameLang":"en"},{"familyName":"松森","familyNameLang":"ja"},{"familyName":"マツモリ","familyNameLang":"ja-Kana"}],"givenNames":[{"givenName":"Kenji","givenNameLang":"en"},{"givenName":"堅治","givenNameLang":"ja"},{"givenName":"ケンジ","givenNameLang":"ja-Kana"}],"nameIdentifiers":[{"nameIdentifier":"1299","nameIdentifierScheme":"WEKO"},{"nameIdentifier":"40414445","nameIdentifierScheme":"e-Rad_Researcher","nameIdentifierURI":"https://kaken.nii.ac.jp/ja/search/?qm=40414445"},{"nameIdentifier":"kmatsumori","nameIdentifierScheme":"researchmap","nameIdentifierURI":"http://researchmap.jp/kmatsumori"}]},{"creatorNames":[{"creatorName":"ITAHASHI, Sunao","creatorNameLang":"en"},{"creatorName":"板橋, 直","creatorNameLang":"ja"},{"creatorName":"イタハシ, スナオ","creatorNameLang":"ja-Kana"}],"familyNames":[{"familyName":"ITAHASHI","familyNameLang":"en"},{"familyName":"板橋","familyNameLang":"ja"},{"familyName":"イタハシ","familyNameLang":"ja-Kana"}],"givenNames":[{"givenName":"Sunao","givenNameLang":"en"},{"givenName":"直","givenNameLang":"ja"},{"givenName":"スナオ","givenNameLang":"ja-Kana"}],"nameIdentifiers":[{"nameIdentifier":"1908","nameIdentifierScheme":"WEKO"},{"nameIdentifier":"80354009","nameIdentifierScheme":"e-Rad_Researcher","nameIdentifierURI":"https://kaken.nii.ac.jp/ja/search/?qm=80354009"},{"nameIdentifier":"Itahashi_Sunao","nameIdentifierScheme":"researchmap","nameIdentifierURI":"http://researchmap.jp/Itahashi_Sunao"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2025-10-01"}],"displaytype":"preview","filename":"TRNIRE210_p61-73.pdf","filesize":[{"value":"3 MB"}],"format":"application/pdf","license_note":"(c) 国立研究開発法人 農業・食品産業技術総合研究機構\nNational Agriculture and Food Research Organization, Japan","licensetype":"license_note","mimetype":"application/pdf","url":{"url":"https://repository.naro.go.jp/record/2001391/files/TRNIRE210_p61-73.pdf"},"version_id":"4432b4da-01c2-4501-a367-c1986346c1c2"}]},"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":"霞ヶ浦流域の主要河川の窒素濃度変化とその要因解明","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"霞ヶ浦流域の主要河川の窒素濃度変化とその要因解明","subitem_title_language":"ja"},{"subitem_title":"Changes of Nitrogen Concentration in Branch River of Lake Kasumigaura and Their Causes","subitem_title_language":"en"}]},"item_type_id":"12","owner":"121","path":["1","1750150221744"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2025-10-01"},"publish_date":"2025-10-01","publish_status":"0","recid":"2001391","relation_version_is_last":true,"title":["霞ヶ浦流域の主要河川の窒素濃度変化とその要因解明"],"weko_creator_id":"121","weko_shared_id":-1},"updated":"2026-01-30T04:58:39.964104+00:00"}