{"created":"2021-03-01T06:43:17.938322+00:00","id":25347,"links":{},"metadata":{"_buckets":{"deposit":"0aff9168-8da3-41ad-a5e4-8bb5533fae5f"},"_deposit":{"id":"25347","owners":[],"pid":{"revision_id":0,"type":"depid","value":"25347"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00025347","sets":["27:2466:2467:2529","9:504:2469:2530"]},"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Study on the Nut Fall Fluctuation of Japanese Beech (Fagus japonica Maxim.) and Siebold's Beech (F. crenata Blume) for 17 Years in a Natural Beech Forest in the Chichibu Mountains, Central Japan"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2001","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"16","bibliographicPageStart":"1","bibliographicVolumeNumber":"106","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":"秩父山地のイヌブナ－ブナ林における17年間の堅果落下状況の推移から，イヌブナ，ブナともに2年に1回程度結実（総堅果落下量≧20個/m2）することが明らかになった。最大総堅果落下量はブナで992.4個/m2（1993年），イヌブナで943.9個/m2（1988年）であった。ブナおよびイヌブナの豊作年（総堅果落下量≧100個/m2）には明瞭な周期性は認められなかった。両種の豊作年が重なるのは2.3～3回に1回程度であると推定された。ブナとイヌブナの豊作年における平均健全堅果率（健全堅果量/総堅果落下量）は，イヌブナの方がブナよりも有意に高かった。同じく豊作年における両種の平均虫害堅果率（虫害堅果量/堅果落下量）はイヌブナよりもブナが有意に高かった。豊作年における総堅果落下量に占める潜在健全堅果量（健全堅果量＋虫害堅果量＋鳥獣害堅果量）の割合は7割程度で，平均値は両種間で有意な差がなかった。また，潜在健全堅果量に占める虫害堅果量の割合，すなわち虫害堅果率の平均値はブナがイヌブナよりも有意に高かった。これらのことから，ブナの健全堅果率が低い原因は同種の虫害堅果率が高いことによるものといえる。両種の豊作が同調した1993年と2000年の虫害堅果の落下時期はブナの方が早い傾向にあった。その原因として，ブナ堅果がイヌブナ堅果に比べて，早く成熟時の堅果サイズに達することによるものと推察された。ブナの虫害堅果落下時期は6月初旬～8月初旬および10月中旬～10月下旬に二つのピークが認められた。ブナの虫害堅果落下時期が二山型を示す現象は，東北地方と栃木県高原山においても観察されており，少なくとも東北地方から関東地方に広くみられる現象である可能性が示唆された。ブナ，イヌブナ堅果に共通する主要食害者としてブナヒメシンクイが重要であることが示唆された。日本海側に比べて太平洋側のブナの虫害堅果率が高い原因として，後者は冬期寡雪であることおよびイヌブナとブナが混生しており，両種の豊作年が必ずしも重ならないことが重要であると推論された。","subitem_description_type":"Abstract"},{"subitem_description":"In order to investigate the long-term fluctuation of the seed production of beech species, the amounts of fallen nuts of Japanese beech (Fagus japonica Maxim.) and Siebold's beech (F. crenata Blume) were surveyed in sample plots of a natural beech forest in the Chichibu Mountains, Central Japan, for 17 years (1984-2000). Both of the beech species bore fruit (nuts≧20/m2) about half of the years. The maximum total fallen nuts were 992.4 nuts/m2 in Siebold'beech (1993) and 943.9 nuts/m2 in Japanese beech (1988), respectively. The mast year (nuts≧100/m2) interval was irregular. The probability when mast year of both beech species synchronize was estimated about once in 2.3-3 times of the mast year. The average ratio of sound nuts (SN) to total fallen nuts (TFN) of Japanese beech in the mast year was significantly higher than that of Siebold's beech. The average ratio of insect-damaged nuts (IDN) to TFN of Japanese beech in the mast year was significantly smaller than that of Siebold's beech. There was no significant difference between the species in the average ratio of potential sound nuts (PSN=SN+IDN+Animal-damaged nuts) to TFN. The average ratio of IDN to PSN of Siebold's beech was significantly higher than that of Japanese beech. The low average ratio of SN in Siebold's beech was mainly caused by high average ratio of IDN. The falling time of IDN of Siebold's beech nuts tended to be earlier than that of Japanese beech, as the growth of the Siebold's beech nuts is about two month faster than that of Japanese beech. As to the falling time of IDN in the synchronized mast year of both species in 1993 and 2000, Siebold's beech showed two modes at early June-early Aug. and mid Oct.-late Oct. The bimodal pattern for the falling time of IDN in Siebold's beech was also observed at Kunimi, Obonai (northern Honshu) and Mt. Takahara (central Honshu). This fact suggests that the phenomenon of bimodal insect damage on Siebold's beech nuts might be common in Tohoku and Kanto district. Pseudopammene fagivora Komai is one of the most important nut predators, for both Siebold's and Japanese beech. Larger insect damage in Siebold's beech nuts in the Pacific Ocean side in comparison to the Sea of Japan side, might be caused by the two factors that there are much smaller snow in winter and that mast year of two beech species is not always synchronize each other.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"54210","nameIdentifierScheme":"WEKO"}],"names":[{"name":"KAJI, Mikio"}]},{"nameIdentifiers":[{"nameIdentifier":"54211","nameIdentifierScheme":"WEKO"}],"names":[{"name":"SAWADA, Haruo"}]},{"nameIdentifiers":[{"nameIdentifier":"54212","nameIdentifierScheme":"WEKO"}],"names":[{"name":"IGARASHI, Yuji"}]},{"nameIdentifiers":[{"nameIdentifier":"54213","nameIdentifierScheme":"WEKO"}],"names":[{"name":"KABAYA, Hajime"}]},{"nameIdentifiers":[{"nameIdentifier":"54214","nameIdentifierScheme":"WEKO"}],"names":[{"name":"NITAMI, Toshio"}]}]},"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":"新領域創成科学研究科環境学専攻"},{"subitem_text_value":"農学生命科学研究科附属秩父演習林"},{"subitem_text_value":"Institute of Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo"},{"subitem_text_value":"University Forest in Chichibu, Graduate School of Agricultural and Life Sciences, The University of Tokyo"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"梶, 幹男"}],"nameIdentifiers":[{"nameIdentifier":"54205","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"澤田, 晴雄"}],"nameIdentifiers":[{"nameIdentifier":"54206","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"五十嵐, 勇治"}],"nameIdentifiers":[{"nameIdentifier":"54207","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"蒲谷, 肇"}],"nameIdentifiers":[{"nameIdentifier":"54208","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"仁多見, 俊夫"}],"nameIdentifiers":[{"nameIdentifier":"54209","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":"esrh106001.pdf","filesize":[{"value":"1.1 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"esrh106001.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/25347/files/esrh106001.pdf"},"version_id":"07c588eb-4424-427b-8df5-63ad1168d159"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"イヌブナ","subitem_subject_scheme":"Other"},{"subitem_subject":"ブナ","subitem_subject_scheme":"Other"},{"subitem_subject":"ブナ類堅果落下量","subitem_subject_scheme":"Other"},{"subitem_subject":"堅果捕食者","subitem_subject_scheme":"Other"},{"subitem_subject":"秩父山地","subitem_subject_scheme":"Other"},{"subitem_subject":"Japanese beech","subitem_subject_scheme":"Other"},{"subitem_subject":"Siebold's beech","subitem_subject_scheme":"Other"},{"subitem_subject":"Nut fall amount","subitem_subject_scheme":"Other"},{"subitem_subject":"Nut predator","subitem_subject_scheme":"Other"},{"subitem_subject":"Chichibu Mountains","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":"秩父山地のイヌブナ-ブナ林における17年間のブナ類堅果落下状況","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"秩父山地のイヌブナ-ブナ林における17年間のブナ類堅果落下状況"}]},"item_type_id":"4","owner":"1","path":["2530","2529"],"pubdate":{"attribute_name":"公開日","attribute_value":"2012-07-17"},"publish_date":"2012-07-17","publish_status":"0","recid":"25347","relation_version_is_last":true,"title":["秩父山地のイヌブナ-ブナ林における17年間のブナ類堅果落下状況"],"weko_creator_id":"1","weko_shared_id":null},"updated":"2022-12-19T04:03:38.573226+00:00"}