{"created":"2021-03-01T06:43:31.647394+00:00","id":25557,"links":{},"metadata":{"_buckets":{"deposit":"0b6d3523-843d-409f-8a47-a4270cd8fdcf"},"_deposit":{"id":"25557","owners":[],"pid":{"revision_id":0,"type":"depid","value":"25557"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00025557","sets":["27:2466:2467:2585","9:504:2469:2586"]},"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Changes in Aboveground Biomass with Age in Young Cryptomeria japonica Stands"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1988","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"57","bibliographicPageStart":"31","bibliographicVolumeNumber":"78","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":"スギ林の地上部現存量，とくに葉の現存量が林冠の閉鎖前後に，どのようにかわるかを，同じ林分で時をおってしらべた。調査林分は，東京大学千葉演習林仁ノ沢（39林班C2－1小班）所在の密度試験地の一部で，3段階の密度区画を対象とした。各区画は35m×30mの長方形で，それぞれの中央に20m×10mの継続測定区，D区（植栽密度13,333本・ha－1），M区（6,667本・ha－1），S区（3,333本・ha－1）を設置，周辺部から試料木を伐倒し，継続測定区の現存量を推定した。調査は林齢14年生（1980年）から20年生（1986年）の間に5回，いずれも5月前半におこなった。葉の現存量は林冠の閉鎖時に，一時的に大きくなる。最大値は，D区が44.4t・ha－1（16年生時），M区が42.0t・ha－1（18年生時），S区が31.2t・ha－1（15年生時）で，D区，M区では，その後，自然間引きがおこり，葉の現存量の減少がいちじるしい。立木密度が高いほど，下枝が枯れあがるので，葉が部分的に集中するが，葉密度（乾重）は1kg・m－3前後に上限がみられた。枝や幹の現存量は，木質の蓄積により林齢とともに増加する。しかし，D区の枝の現存量だけは，葉と同じように16年生時が最大，以後減少した。今後，葉の現存量がどの程度の値におちつくかは，さらに測定を継続しなければわからない。また，密度と葉の現存量の経年変化の関係を，よりあきらかにするには，同じような密度試験地での測定のくりかえしが必要である。","subitem_description_type":"Abstract"},{"subitem_description":"Changes in aboveground biomass, especially in leaf biomass, of a young manmade Cryptomeria japonica forest were followed in the same plots during the period before and after canopy closing. The study plots were in a spacing experiment stand in Tokyo University Forest in Chiba and 35m×30m in rectangle, respectively, and differed in planting density; 13,333 tress・ha-1 in CrD, 6,667 trees・ha-1 in CrM, and 3,333 trees・ha-1 in CrS. The continuous study plot, 20m×10m in rectangle, was divided in the middle of each study plot; D (dense) in CrD, M (medium) in CrM, and S (sparse) in CrS. The biomasses of the plots, D, M, and S were estimated by cutting trees selected from the part around each continuous study plot, respectively. The estimations were made five times during years 1980 to 1986, i. e. 14-, 15-, 16-, 18-, and 20-year-old in stand age. The measurements in each year were made in the first half of May before the beginning of vigorous growth. A passing higher level of leaf biomass was observed when the forest canopy was closing. The maximum leaf biomass in each continuous study plot was 44.4t・ha-1 in D of 16-year-old, 42.0t・ha-1 in M of 18-year-old, and 31.2t・ha-1 in S of 15-year-old. After the maximum, the leaf biomass decreased rapidly with the beginning of natural thinning in the plots D and M. The clear length of tree increased with density, and the leaf density in the crown layer became higher. But there was a upper limit in leaf density, nearly at 1 kg dry weight・m-3. The branch and stem biomasses increased with age by accumulation of wood except the branch in D. The branch biomass in D showed a passing higher level as seen in leaf biomass. The measurements in these plots will be continued to follow the biomass in the future. Further data may be necessary for checking the effect of density on leaf biomass changes.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"55395","nameIdentifierScheme":"WEKO"}],"names":[{"name":"NEGISI, Ken'itiroo"}]},{"nameIdentifiers":[{"nameIdentifier":"55396","nameIdentifierScheme":"WEKO"}],"names":[{"name":"SUZUKI, Makoto"}]},{"nameIdentifiers":[{"nameIdentifier":"55397","nameIdentifierScheme":"WEKO"}],"names":[{"name":"SAKURA, Tsuguo"}]},{"nameIdentifiers":[{"nameIdentifier":"55398","nameIdentifierScheme":"WEKO"}],"names":[{"name":"TANGE, Takeshi"}]},{"nameIdentifiers":[{"nameIdentifier":"55399","nameIdentifierScheme":"WEKO"}],"names":[{"name":"SUZUKI, Sadao"}]},{"nameIdentifiers":[{"nameIdentifier":"55400","nameIdentifierScheme":"WEKO"}],"names":[{"name":"SHIBA, Yoshihiro"}]}]},"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":"東京大学農学部千葉演習林"},{"subitem_text_value":"東京大学農学部林学科"},{"subitem_text_value":"University Forest in Chiba, Faculty of Agriculture, University of Tokyo"},{"subitem_text_value":"Department of Forestry, Faculty of Agriculture, University of Tokyo"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"根岸, 賢一郎"}],"nameIdentifiers":[{"nameIdentifier":"55389","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"鈴木, 誠"}],"nameIdentifiers":[{"nameIdentifier":"55390","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"佐倉, 詔夫"}],"nameIdentifiers":[{"nameIdentifier":"55391","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"丹下, 健"}],"nameIdentifiers":[{"nameIdentifier":"55392","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"鈴木, 貞夫"}],"nameIdentifiers":[{"nameIdentifier":"55393","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"斯波, 義宏"}],"nameIdentifiers":[{"nameIdentifier":"55394","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":"esrh078003.pdf","filesize":[{"value":"1.4 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"esrh078003.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/25557/files/esrh078003.pdf"},"version_id":"5f09d964-6f50-4fff-9b04-5b49e0821bd0"}]},"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":"スギ幼齢林における地上部現存量の経年変化","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"スギ幼齢林における地上部現存量の経年変化"}]},"item_type_id":"4","owner":"1","path":["2586","2585"],"pubdate":{"attribute_name":"公開日","attribute_value":"2014-09-03"},"publish_date":"2014-09-03","publish_status":"0","recid":"25557","relation_version_is_last":true,"title":["スギ幼齢林における地上部現存量の経年変化"],"weko_creator_id":"1","weko_shared_id":null},"updated":"2022-12-19T04:03:47.201576+00:00"}