コナラ天然下種更新における小形掘削機による地床処理が，雑草木の発達への影響を通して，
実生の定着にどのように働くかを3年間調査した。処理による地下器官の除去あるいは破壊は、
伐採後1年目では雑草木の被度を低く保ち， 2年目以降ではササ類の発達を遅らせ，低水の発
達を抑える効果をもたらした。機械地床処理は，実生の生残率を高め，成長を促進した。また，
処理区では植生型により実生の生残率が有意に異なっていた。本処理により，コナラ実生の優
占する場所が無処理区の3倍以上となり，面積割合で20%を超えた。これは，更新を早く確実
に進めるうえで重要と考えた。
Influences of ground treatment on seedling establishment using a small-sized excavator were observed in a natural regeneration site of Quercus serrata. Removal and destruction of under-ground organs of weeds and shrubs by the ground treatment provided effects during the establishment of Quercus serrata seedlings; keeping the coverage of weeds and shrubs low at the first year after the treatment and delaying or repressing the active reflush of bamboo grasses and shrubs from under-ground organs at the following years. The ground treatment also raised the survival ratio of Quercus serrata seedlings significantly and promoted their growth at various places of the regeneration site: the area dominated by Quercus serrata seedlings was obviously enlarged. These results imply
that the ground treatment facilitated the seedlings to establish themselves safely and also accelerated their regeneration progress.
出版者
岩手大学農学部附属寒冷フィールドサイエンス教育研究センター
その他のタイトル
Effects of ground treatment using a small-sized excavator in a natural regeneration site of Quercus serrata: Control of weeds and shrubs for establishment of seedlings
コナラ天然下種更新における小形掘削機による地床処理の効果―雑草木の発達制御と実生の定着―
biuf-n36p47-60.pdf
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