{"created":"2021-03-01T06:43:33.424639+00:00","id":25584,"links":{},"metadata":{"_buckets":{"deposit":"4a868646-327a-483e-b78b-a67d27ae4a25"},"_deposit":{"id":"25584","owners":[],"pid":{"revision_id":0,"type":"depid","value":"25584"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00025584","sets":["27:2466:2467:2589","9:504:2469:2590"]},"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Analysis of Thinning Effects on Diameter Increment of Japanese ceder, Hinoki cypress, Sawara cypress, Japanese larch Experimental Plots in Tokyo University Forest at Chichibu"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1987","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"329","bibliographicPageStart":"287","bibliographicVolumeNumber":"76","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":"東京大学秩父演習林内のスギ，ヒノキ，サワラ，カラマツの間伐試験地において，間伐区と無間伐区の直径生長測定結果を比較することによって，間伐が林木の直径生長に及ぼす影響を様々な角度から検討した。間伐効果を評価するためには，間伐時における直径分布の違いを考慮すべきであると考え，筆者らは，間伐林分と無間伐林分の同じ直径階の林木について，それぞれの生長率を比較することにした。そして，間伐直後では，各直径階層にわたり直径上位木から下位木までほぼ一様な直径生長率を示していることが認められた。また，下位木において間伐区と無間伐区の生長率の間に顕著な差異が生じ，この傾向は強度に間伐を行った方が早期にかつ顕著に現れることが認められた。この下位木における生長率の違いが原因となって，無間伐区においては変動係数と歪度の値が増加しているのに対して，間伐区においてはこの二つの指標の値が比較的安定しており，直径分布の形が安定していることが認められた。次に，樹幹解析資料から，MITSCHERLICH式D＝M（1－e－kt）は単木の年齢25年生以上の直径生長を表現するのに有効な手段であることが認められた。そして，MITSCHERLICH式の係数kの値は，間伐によって減少し，もう一方の係数MはM＝D/（1－e－kt）の式によって増加することが認められた。このことから，筆者らは，間伐が個々の林木の生長曲線の乗り換えをもたらしていると考えた。最後に，断面積生長量と丸太生産量を指標として，林分レベルの間伐効果について分析を行った。そして，断面積生長量は本数密度にかかわらずほぼ一定であることが認められた。しかし，丸太生産の面では，耐陰性の強い樹種において，間伐区の方が大径木の割合が高いという結果を得た。","subitem_description_type":"Abstract"},{"subitem_description":"In order to analyze the thinning effects on diameter increment, time-series stand data of thinned plots was compared with that of unthinned plots from various angles. The difference of the diameter distributions just after thinning between thinned plots and unthinned plots influences the increment of the mean diameter. First the authors compared thinned plot and unthinned plot by diameter class in terms of the average growth rate. Then the increment percents of diameter were nearly equal in every diameter class after thinning. The differnce of increment percent between thinned plots and unthinned plots was marked in the lower diameter classes. This tenderncy appeared more quickly and markedly in heavily thinned plots than in lightly thinned plots. The difference of increment percent in the lower diameter classes caused the coefficient of variation and the skewness of the diameter distribution to be more unstable in unthinned plots than in thinned plots. Next the MITSCHERLICH equation fitted well to the diameter growth curve above 25 years old. The parameter k of MITSCHERLICH equation, in which the parameter L was fixed to 1, decreased by thinning. And the parameter M increased by the following equation. M=D/{1-EXP(-kt)} This fact showed that thinning changes the growth curve of each tree. Finally the stand level thinning effects were analyzed in terms of the basal area increment and timber yield. The increments of basal area were nearly equal regardless of stand density. But timber yield and the percentage of large-sized tree of thinned plots were larger than those of unthinned plots in shade-torelant species.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"55500","nameIdentifierScheme":"WEKO"}],"names":[{"name":"YAMAMOTO, Hirokazu"}]},{"nameIdentifiers":[{"nameIdentifier":"55501","nameIdentifierScheme":"WEKO"}],"names":[{"name":"ITO, Koya"}]},{"nameIdentifiers":[{"nameIdentifier":"55502","nameIdentifierScheme":"WEKO"}],"names":[{"name":"OHATA, Shigeru"}]},{"nameIdentifiers":[{"nameIdentifier":"55503","nameIdentifierScheme":"WEKO"}],"names":[{"name":"SASAKI, Kazuo"}]},{"nameIdentifiers":[{"nameIdentifier":"55504","nameIdentifierScheme":"WEKO"}],"names":[{"name":"OMURA, Kazuya"}]}]},"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":"東京大学農学部秩父演習林"},{"subitem_text_value":"University Forest at Chichibu, Faculty of Agriculture, University of Tokyo"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"山本, 博一"}],"nameIdentifiers":[{"nameIdentifier":"55495","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"伊藤, 幸也"}],"nameIdentifiers":[{"nameIdentifier":"55496","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"大畑, 茂"}],"nameIdentifiers":[{"nameIdentifier":"55497","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"佐々木, 和男"}],"nameIdentifiers":[{"nameIdentifier":"55498","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"大村, 和也"}],"nameIdentifiers":[{"nameIdentifier":"55499","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":"esrh076011.pdf","filesize":[{"value":"2.0 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"esrh076011.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/25584/files/esrh076011.pdf"},"version_id":"b78a3bfc-262d-498f-94fc-d488ac19c9dc"}]},"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":"東京大学秩父演習林のスギ・ヒノキ・サワラ・カラマツの生長試験地における間伐効果の解析","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"東京大学秩父演習林のスギ・ヒノキ・サワラ・カラマツの生長試験地における間伐効果の解析"}]},"item_type_id":"4","owner":"1","path":["2590","2589"],"pubdate":{"attribute_name":"公開日","attribute_value":"2014-09-03"},"publish_date":"2014-09-03","publish_status":"0","recid":"25584","relation_version_is_last":true,"title":["東京大学秩父演習林のスギ・ヒノキ・サワラ・カラマツの生長試験地における間伐効果の解析"],"weko_creator_id":"1","weko_shared_id":null},"updated":"2022-12-19T03:52:51.332545+00:00"}