東京大学北海道演習林の針広混交林における択伐施業がミズナラの個体群動態に及ぼす影響
スポンサーリンク
概要
- 論文の詳細を見る
We surveyed the diameter at breast height (d.b.h) of all living trees (n = 297) within a 7.8-ha site in 2003 soon after selection cutting and re-measured d.b.h of those still-living in 2008, five years after selection cutting, to clarify the effects of selection cutting on the dynamics of a Quercus crispula population in a conifer-hardwood mixed forest in the University of Tokyo Hokkaido Forest. Then, we surveyed the site and identified the spatial location and d.b.h. of new recruits (height ≧ 130cm). Furthermore, we established 5 × 5-m plots for evaluating seedling and sapling abundance in four different environments, 1) around new stumps of Q. crispula, 2) closed canopy, 3) south-facing slopes along the forest roads, and 4) north-facing slopes. The former two environments are in forest stands, whereas the latter two are on the forest edge. Then, we counted the number of Q. crispula seedlings (height ＜ 20cm) and saplings (20cm ≦ height ＜ 130cm). This study revealed that no dead trees were detected during the five years after selection cutting. We also found that living trees in selection-cutting forests showed greater growth than those in forests without silvicultural practice. Furthermore, the numbers of seedlings and saplings were significantly higher around new stumps than in those in other environments. In contrast, very few new recruits were detected in forest stands, most of recruits occurred in the south-facing slope in the forest edge. It is assumed that selection cutting increased the number of Q. crispula seedlings and saplings, however, it did not affect the trend of recruitment.
- 2013-07-25
著者
関連論文
- 東京大学北海道演習林の針広混交林における択伐施業がミズナラの個体群動態に及ぼす影響
- 森林内におけるハンディGNSS受信機の測位精度(会員研究発表論文)
- 機械地拵えにおけるGPSトラッキングの利用可能性(会員研究発表論文)
- 東京大学北海道演習林の異なる4標高に植栽されてから45年以上が経過した11樹種の生存と成長
- 山火事跡二次林の間伐によるウダイカンバの樹冠発達(会員研究発表論文)
- 格子状皆伐による天然更新の促進試験(II) : 地がき処理による更新促進試験(会員研究発表論文)
- 格子状皆伐による天然更新の促進試験 : ストローブマツ造林地皆伐跡地における実生の発生状況(会員研究発表論文)
- シナノキとオオバボダイジュにおける伐採前後の萌芽発生状況(会員研究発表論文)
- 異なる4標高域に移植された北方樹木11種の47年後の生存と成長