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150 ha 90 ha 30 齢級 上 - maff.go.jpカンバ類が侵入したトドマツ人工林の高性能林業機械による間伐 手法の確立 1.課題を取り上げた背景 北海道の国有林・民有林を合わせた人工林面積は約
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