{"created":"2021-03-01T06:43:21.306952+00:00","id":25399,"links":{},"metadata":{"_buckets":{"deposit":"d3ecb966-bc80-4609-a815-9cd9f42c3501"},"_deposit":{"id":"25399","owners":[],"pid":{"revision_id":0,"type":"depid","value":"25399"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00025399","sets":["27:2466:2467:2543","9:504:2469:2544"]},"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Physiological Status of Declining Camphor Trees after Therapy"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1998","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"197","bibliographicPageStart":"185","bibliographicVolumeNumber":"99","bibliographic_titles":[{"bibliographic_title":"東京大学農学部演習林報告"}]}]},"item_4_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"近年，衰退樹木に対する樹勢回復処置が多く行われるようになったが，このような処置に関する科学的知見は乏しく，処置の効果を科学的に明らかにすることが必要とされている。東京大学総合図書館前に，クスノキ（Cinnamomum camphora）が2本，東西対称に植栽されている。1985年から1987年に両クスノキを挟む形で新校舎建設が行われて以来，西側の個体（LW）は東側の個体（LE）と比較して著しく枝葉が減少し，衰退が顕著となった。衰退の原因として，コンクリート舗装による根への水分および酸素の供給の制限，建築工事に伴う根系の傷害などが考えられた。そこで，1996年にLW，LEを対象に樹勢回復処置が施された。この処置の効果を検定するため，処置前後の樹体の生理状態について検討を加えた。処置前の1995年にLW，LEおよび外観上は健全な生育を示す安田講堂前の個体（C1）について日中の木部圧ポテンシャル（Ψw）の測定およびP－V曲線法による水分特性値（Ψtlpw，Ψsats等）の測定を行った。処置後，1997年にLW，LE，C1および構内の健全個体（C2，C3）について水分生理状態の測定，フェノロジーの調査，葉のクロロフィル量の測定を行った。処置前の調査では，日中のΨwとΨtlpw，Ψsatsは，LWではLEと比較して低い値を示した。このことから，LWはLEに比べて強い水ストレス下にあることが示唆され，今後も衰退が進行する可能性があると考えられた。処置後のLWとLEの水分生理状態は処置前と同様の値を示し，処置後もLWはLEに比べて強い水ストレス下にあったものの，処置後，LWの枝葉の密度の増加が観察されたことから，衰退は進行していないものと考えられた。フェノロジー観察の結果，LWでは，他調査木と比較して開芽期間が長く，展葉期間が短いこと，1年生葉の落葉期が早いことが明らかにされ，このようなフェノロジー特性が水ストレス下の衰退木に特徴的である可能性が示唆された。葉のクロロフィル量は，LWで他調査木と比較して有意に低い値を示した。以上のように，LWは処置後も健全個体と比較して水分特性値やフェノロジー特性，クロロフィル量に差が認められるものの，枝葉の成長は良好であり，樹勢回復処置が衰退の進行を停止させた可能性がある。このような処置の効果は，大きな樹木の生理状態などに速やかには反映しにくいことから，今後も継続的な観察が必要である。","subitem_description_type":"Abstract"},{"subitem_description":"Recently, following the increasing concern for protection and preservation of urban trees, many therapeutic treatments for old or declining trees have been carried out according to instructions by tree doctors. For the development of therapeutic principles and techniques, it is important to evaluate the effectiveness of such therapeutic treatments scientifically. There are two large camphor trees in front of the Central Library on the campus of the University of Tokyo which have been planted symmetrically east and west. Two buildings have been constructed between 1985 and 1987 on either side of the two camphor trees. After construction, the west-side camphor tree (LW) started declining. In 1994, the decline of LW became remarkable, as both branch and leaf density of LW decreased compared to the east-side tree (LE). The causes of the decline are thought to be soil compaction and root injury occurring during construction and limited water and oxygen availability due to concrete paving around the stem base. In 1996, to improve the health of the declining tree, therapeutic treatment (soil improvement and pruning) was undertaken. In order to evaluate the effectiveness of the therapy, the physiological status of LW and LE were investigated before and after therapy. The physiological status of other camphor trees on the campus were also investigated. In 1995, before therapy, midday water potentials were measured and water relation parameters such as water potential at turgor-loss point (Ψtlpw) and osmotic potential at full turgidity (Ψsats) were estimated by pressure-volume analysis. In 1997, following therapy, the water relations and chlorophyll contents were measured again. In addition, the phenology of budding and defoliation was also observed. Prior to therapy, water relations of LW were lower than those of LE. Following therapy, both Ψtlpw and Ψsats of LW were lower than those of LE. Differences between their water relation values remained unchanged before and after therapy. Of all trees sampled, the longest budding period, the shortest leaf unfolding period and the fastest defoliation were all observed in LW. Leaf chlorophyll contents of LW were significantly lower than LE. However both branch and leaf density of LW increased after therapy. It was shown that the therapy has improved the root vitality of LW and prevented further decline. Such therapy does not work immediately on a large tree, therefore continuing observation is needed.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"54489","nameIdentifierScheme":"WEKO"}],"names":[{"name":"NISHIYA, Yuko"}]},{"nameIdentifiers":[{"nameIdentifier":"54490","nameIdentifierScheme":"WEKO"}],"names":[{"name":"TAKASE, Masako"}]},{"nameIdentifiers":[{"nameIdentifier":"54491","nameIdentifierScheme":"WEKO"}],"names":[{"name":"FUKUDA, Kenji"}]},{"nameIdentifiers":[{"nameIdentifier":"54492","nameIdentifierScheme":"WEKO"}],"names":[{"name":"SUZUKI, Kazuo"}]}]},"item_4_publisher_20":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"東京大学大学院農学生命科学研究科附属演習林"}]},"item_4_source_id_10":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00162451","subitem_source_identifier_type":"NCID"}]},"item_4_source_id_8":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"03716007","subitem_source_identifier_type":"ISSN"}]},"item_4_subject_15":{"attribute_name":"日本十進分類法","attribute_value_mlt":[{"subitem_subject":"610","subitem_subject_scheme":"NDC"}]},"item_4_text_21":{"attribute_name":"出版者別名","attribute_value_mlt":[{"subitem_text_value":"The Tokyo University Forests"}]},"item_4_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"東京大学大学院農学生命科学研究科森林科学専攻"},{"subitem_text_value":"神奈川県自然保護センター"},{"subitem_text_value":"Department of Forest Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo"},{"subitem_text_value":"Kanagawa Prefectural Nature Conservation Center"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"西谷, 裕子"}],"nameIdentifiers":[{"nameIdentifier":"54485","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"高瀬, 雅子"}],"nameIdentifiers":[{"nameIdentifier":"54486","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"福田, 健二"}],"nameIdentifiers":[{"nameIdentifier":"54487","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"鈴木, 和夫"}],"nameIdentifiers":[{"nameIdentifier":"54488","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-06-09"}],"displaytype":"detail","filename":"esrh099008.pdf","filesize":[{"value":"1.5 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"esrh099008.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/25399/files/esrh099008.pdf"},"version_id":"78644e08-03a1-4987-8be0-96223093ccc9"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"クスノキ","subitem_subject_scheme":"Other"},{"subitem_subject":"樹勢回復処置","subitem_subject_scheme":"Other"},{"subitem_subject":"水分生理特性","subitem_subject_scheme":"Other"},{"subitem_subject":"フェノロジー","subitem_subject_scheme":"Other"},{"subitem_subject":"クロロフィル量","subitem_subject_scheme":"Other"},{"subitem_subject":"Cinnamomum camphora","subitem_subject_scheme":"Other"},{"subitem_subject":"Soil improvement","subitem_subject_scheme":"Other"},{"subitem_subject":"Water relations","subitem_subject_scheme":"Other"},{"subitem_subject":"Phenology","subitem_subject_scheme":"Other"},{"subitem_subject":"Chlorophyll content","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":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"クスノキ衰退木の処置と樹体の生理状態","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"クスノキ衰退木の処置と樹体の生理状態"}]},"item_type_id":"4","owner":"1","path":["2544","2543"],"pubdate":{"attribute_name":"公開日","attribute_value":"2014-09-03"},"publish_date":"2014-09-03","publish_status":"0","recid":"25399","relation_version_is_last":true,"title":["クスノキ衰退木の処置と樹体の生理状態"],"weko_creator_id":"1","weko_shared_id":null},"updated":"2022-12-19T04:03:39.884301+00:00"}