{"created":"2023-05-15T12:04:39.523154+00:00","id":9218,"links":{},"metadata":{"_buckets":{"deposit":"517ca7f3-2d0f-4453-84bc-67fb7d664991"},"_deposit":{"created_by":3,"id":"9218","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"9218"},"status":"published"},"_oai":{"id":"oai:iwate-u.repo.nii.ac.jp:00009218","sets":["1504:1510"]},"author_link":["72323","72324"],"item_16_alternative_title_23":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Thinnings and light conditions in a sugi (Cryptomeria japonica) plantation (I) : Changes in relative light-intensities on the forest floor"}]},"item_16_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1985-07-25","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"7","bibliographicPageEnd":"260","bibliographicPageStart":"253","bibliographicVolumeNumber":"67","bibliographic_titles":[{"bibliographic_title":"日本林學會誌"}]}]},"item_16_date_6":{"attribute_name":"登録日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2010-10-27"}]},"item_16_description_12":{"attribute_name":"Abstract","attribute_value_mlt":[{"subitem_description":"22年生林分において, 本数率34%の機械的間伐を行った。林床相対照度の変化を調べ, 林分構成因子と結びつけ二, 三の検討を行った。1)樹冠下の幹による遮光率を推定する方法を示した。本林分における推定値は, 間伐前で15%, 間伐後で9%であった。また, 樹冠下の幹の吸光係数は0.2から0.3の範囲にあった。2)林冠のみに遮光される場合の林床相対照度RC_<floor>を算定した。間伐にともなうRC_<floor>の変化は, 樹冠間隙面積率R_<gap>のそれとよく似ており, RC_<floor>≒R_<gap>であった。3)樹冠を構成する全器官の表面積A(ha ha^<-1>)との関係でRC_<floor>をブロットしたところ, 各点は吸光係数0.1の光減衰を表わす線と0.15のそれとの間に落ち, 間伐により0.15に近づく傾向が認められた。4)RC_<floor>とAをもとにして, 樹冠を構成する全器官の平均表面相対照度R_<surface>を定義した。R_<surface>は, 間伐により約30%高くなり, Aの減少にともない指数関数的に上昇した。間伐による立木の受光状態の変化を把握するうえで, R_<surface>-A関係が役に立つと考えた。\n\nThe changes in relative light-intensities on the forest floor after thinning were examined under diffused-light conditions in relationship to the stand characteristics. 1) A method was developed for estimating the ratio of light interception by the trunks under the tree crowns. The light-extinction coefficients of the trunks fell within a range of 0.2 to 0.3. 2) Calculations were made of relative light-intensities on the forest floor intercepted only by the canopy, RC_<floor>. RC_<floor> was proportional to the ratio of the crown gap created by thinning to the plot area, R_<gap>. 3) RC_<floor> values against the total surface area of all components forming the tree crowns A (ha ha^<-1>) were distributed within a range between two curves of 0.1 and 0.15 of the light-extinction coefficient. The curve came close to 0.15 after thinning. 4) R_<surface> was defined as the mean relative light-intensity on surfaces of all components forming the tree crowns. The increase of R_<surface> after thinning was about 30%. R_<surface> increased exponentialy with a decrease of A. The relationship between R_<surface> and A was considered to be useful in evaluating the thinning effects on light conditions.","subitem_description_type":"Other"}]},"item_16_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"72324","nameIdentifierScheme":"WEKO"}],"names":[{"name":"HASHIMOTO, Ryoji"}]}]},"item_16_publisher_14":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"日本森林学会"}]},"item_16_relation_16":{"attribute_name":"異版である","attribute_value_mlt":[{"subitem_relation_type":"isVersionOf","subitem_relation_type_id":{"subitem_relation_type_id_text":"http://ci.nii.ac.jp/naid/110002841194","subitem_relation_type_select":"URI"}}]},"item_16_rights_18":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"日本森林学会"}]},"item_16_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0021-485X","subitem_source_identifier_type":"ISSN"}]},"item_16_text_4":{"attribute_name":"著者(機関)","attribute_value_mlt":[{"subitem_text_value":"岩手大学農学部"}]},"item_16_version_type_27":{"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":"橋本, 良二"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-11-14"}],"displaytype":"detail","filename":"jjfs-v67n7p253-260.pdf","filesize":[{"value":"733.3 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"jjfs-v67n7p253-260.pdf","url":"https://iwate-u.repo.nii.ac.jp/record/9218/files/jjfs-v67n7p253-260.pdf"},"version_id":"3000f2ed-d543-40bb-a42d-d9dd0e494733"}]},"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":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"スギ人工林の間伐と光環境(I)  林床相対照度の変化の検討","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"スギ人工林の間伐と光環境(I)  林床相対照度の変化の検討"}]},"item_type_id":"16","owner":"3","path":["1510"],"pubdate":{"attribute_name":"公開日","attribute_value":"2010-10-27"},"publish_date":"2010-10-27","publish_status":"0","recid":"9218","relation_version_is_last":true,"title":["スギ人工林の間伐と光環境(I)  林床相対照度の変化の検討"],"weko_creator_id":"3","weko_shared_id":-1},"updated":"2023-05-16T11:10:25.653611+00:00"}