publicreadTree census, Long-term permanent plot No.10, Uryu experimental forest, North Hokkaido Experimental Forests (JaLTER), 1990-2010, 毎木調査, 長期観察林番号10号, 雨龍研究林, 北海道北研究林(JaLTER).Uryu Experimental Forest, 雨龍研究林Field Science Center for Northern Biosphere, Hokkaido University, 北海道大学北方生物圏フィールド科学センターMoshiri, 母子里Horokanai, 幌加内Hokkaido, 北海道074-0741Japan, 日本+81-165-38-2125+81-165-38-2410uryu@fsc.hokudai.ac.jphttp://forest.fsc.hokudai.ac.jp/~exfor/fr/Betula platyphylla Sukaczev var. japonica (Miq.) H.Hara Secodary forest has been investigated to examine its stand structure and dynamics extraction. A study plot with area 0.25-ha was introduced in 1990, followed by repeated tree censuses (5 or 10year interval), 北海道大学雨龍研究林109林班シラカバ二次林の林分構成・伐採率等とその後の生長量の推移に関する調査.long-term, permanent plot, uryuData users are required to place an acknowledgement in any publication in which the data are used, and to send a copy of the publication with an usage report., 公表にあたっては、データの出典を謝辞等に明記するとともに、成果品および利用報告を提出する.Uryu Experimental Forest 109 ID of the plot No.10, 雨龍研究林109林班 長期観察林番号100.00.00.00.019901995200020101369216388098Location, 位置The study plot is located in compartment 109 of the Uryu Experimental Forest., 調査地は雨龍研究林109林班に位置する. 調査区の面積は 2500m2 (50×50 m)である. The size of the study plot is 2500m2 (50×50 m; N00 00 00, E000 00 00; N00 00 00, E000 00 00; N00 00 00, E000 00 00; N00 00 00, E000 00 00 ).Targets to measure, 測定対象The census targeted trees with diameter at breast height (1.3 m) equal to or larger than 10-cm in the plot. Trees were identified by metal plate, and their species names were recorded., 調査区内の胸高直径10cm以上の樹木を対象とした. 金番で個体識別し、樹種名を記録した.Diameter at breast height, 胸高直径From 1990 to 2000, diameter at breast height was measured with a caliper., 測定対象木の胸高直径を輪尺を用いて計測(1990年から2000年まで).Scale, 輪尺Girth at breast height, 胸高周囲長Since 2010, girth at breast height was measured with a steel tape., 測定対象木の胸高周囲長をコンベックスを用いて計測(2010年以降).Steel tape, コンベックスHeight 1, 樹高 1From 1990 to 2000, Tree height was measured by observation with a scale pole, 測定対象木の樹高を測桿ポール(1990-2000年).Scale pole, 測桿ポールHeight 2, 樹高 2Since 2010, Tree height was measured by observation with a Hypsometer, 測定対象木の樹高を超音波測高器を用いて計測(2010年以降).Hypsometer, 超音波測高器Survival, 生枯Survival of the target trees was confirmed by observation., 測定対象木の生死を確認.Height of the crown base, 枝下高The census targeted trees with Measured by observation with a scale pole to an accuracy of 1.0m, 調査区内の樹木の枝下高を測定.Scale pole, 測桿ポールGrade of wood quality 2, 樹形級Code indication grade of wood quality, applied for coniferous forests. 1:overstory trees with good wood quality. 2:understory trees, which is expectable to become a good dominant tree. 3a:Trees, which interrupt a better tree. 3b:Trees with unstraight stem or a sign of death, decay or weakening., 樹形級区分は広葉樹林及び針広混交林に適用する. 1: 優勢木 2: 下層木(将来優勢木になる可能性を持つ優良木) 3a: あばれ木 3b: 枯損木・半枯損木・被害木・形質不良木・幹形不良木・傾斜木・倒木.Crown width, 樹冠幅Crown width was measured with a tape measure toward the 0, 90, 180 and 270-degree direction from the base., 測定対象木の樹冠幅を巻尺を用いて東西南北4方向について計測.Tape measure, 巻尺Details of wood damage, 欠点Special instructions on wood damage., 測定対象木の欠点を記録.Details of wood quality, 被害Special instructions on wood quality., 測定対象木の被害を記録.