{"_buckets": {"deposit": "8c61197c-67ba-4f4e-bead-971f925447f1"}, "_deposit": {"id": "11073", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "11073"}, "status": "published"}, "_oai": {"id": "oai:nagoya.repo.nii.ac.jp:00011073", "sets": ["1200"]}, "author_link": ["33561", "33562"], "item_1618209983323": {"attribute_name": "助成情報", "attribute_value_mlt": [{"subitem_award_numbers": {"subitem_award_number": "62560146", "subitem_award_uri": "https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-62560146"}, "subitem_award_titles": [{"subitem_award_title": "林木個体レベルのガス交換機能特性に関する基礎的研究", "subitem_award_title_language": "ja"}], "subitem_funder_identifiers": {"subitem_funder_identifier": "https://doi.org/10.13039/501100001691", "subitem_funder_identifier_type": "Crossref Funder"}, "subitem_funder_names": [{"subitem_funder_name": "日本学術振興会", "subitem_funder_name_language": "ja"}]}]}, "item_19_biblio_info_6": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1989-03", "bibliographicIssueDateType": "Issued"}}]}, "item_19_description_4": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "(1)実験方法 a.実験林木 名古屋大学構内に植栽されている13年生のヒノキ人工林(立木密度15000本ha^\u003c-1\u003e)のうち、樹高4.9m、地上高1.0mでの幹直径6.1cm、幹材積8.2dm^3(1988年6月現在)の林木を測定木とした。 b.二酸化炭素交換速度の測定 測定木の地上部を、光合成有効波長域で約90%の光透過率を持つ、厚さ0.2mmのポリ塩化ビニルフィルム製の同化箱(〓5.0m^3)で被った。同化箱の内部を外気温度に同調させた状態で、二酸化炭素交換速度を通気法により赤外線ガス分析器(IR21、横河電機)で測定した。通気速度は、最大で117m^3h^\u003c-1\u003eであったが、夜間呼吸速度の測定時には、夏季60m^3h^\u003c-1\u003e、冬季15m^3h^\u003c-1\u003eとした。 c.樹幹成長量の測定 毎月一度、測定木の樹幹周囲長を50cm間隔で非破壊的に測定し、測定木の幹材積成長量を計算した。また同時に、同化箱内に蓄積しているリタ-を回収し、測定木の枯死量の推定値とした。 (2)結果 a.呼吸速度 単木地上部呼吸速度R_T〔gCO_2tree^\u003c-1\u003eh^\u003c-1\u003e〕と同化箱内温度T〔C^0〕との関係は、以下に示す指数関係で良く近似された。 R_T=Roexp(K・T) (Ro、Kは月ごとに定まる係数) 上式から計算される呼吸速度の温度係数(=exp(10・K))は、冬季に高く(2.5〜3.0)、夏季に低い(1.4〜2.5)傾向であった。 b.光合成速度 地上部純生産速度に地上部呼吸速度を加えた、総光合成速度Pg(gCO_2tree^\u003c-1\u003ed^\u003c-1\u003e)と日積算照度I(Klxhd^\u003c-1\u003e)との間には、以下に示す双曲線関係が認められた。 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