2023 Fiscal Year Final Research Report
Effects of windthrow disturbances and deer damage on the regeneration of subalpine coniferous forests at the landscape scale
| Project/Area Number |
19K06141
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Review Section |
Basic Section 40010:Forest science-related
|
|---|
| Research Institution | Gunma University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
小山 泰弘 長野県林業総合センター, 育林部, 育林部長 (00450817)
鈴木 智之 東京大学, 大学院農学生命科学研究科(農学部), 助教 (20633001)
|
|---|
| Project Period (FY) |
2019-04-01 – 2024-03-31
|
| Keywords | 亜高山帯針葉樹林 / ニホンジカ / 風倒撹乱 / 更新動態 / 景観スケール / 倒木処理 |
|---|
| Outline of Final Research Achievements |
This study aims to evaluate the impact of differences in human interference after windthrow disturbances and the increase in Japanese deer occurrence on the dynamics of stand regeneration at the landscape scale in subalpine coniferous forests. In an old-growth stand, the cumulative damage caused by deer sharply increased along with higher tree mortality rates, leading to significant changes in tree species composition due to differences in survival rates among species. The presence of bryophytes on fallen trees remaining on the forest floor resulted in higher seedling survival rates, whereas seedling regeneration was limited in stands where fallen trees were removed. Deer behavior depended not only on the type of understory vegetation available as food but also on the ease of movement on the forest floor. Additionally, the expanded grasslands resulting from the removal of fallen trees influenced the current distribution and usage frequency of deer.
|
| Free Research Field |
森林生態学
|
| Academic Significance and Societal Importance of the Research Achievements |
大規模風倒木搬出により形成された景観構造がニホンジカの分布・行動に与える影響とそれが樹木更新に与える影響に着目した本研究では，亜高山帯域で顕在化しているシカによる樹木被害が人為干渉と相互作用的にこれらの林分の更新過程に及ぼす要因を解明し，景観スケールにおける将来の森林構造の予測・評価から亜高山帯域の自然環境の保全対策を検討する資料を提供できた．特に，本研究課題の成果から将来更新不良または森林衰退が懸念される区域を予測することができ，主要構成樹種の更新特性とそれに影響する獣害要因に関する情報は，天然林の保全対策だけでなく、伊勢湾台風撹乱後に植林されたカラマツ林伐採後の施業にも不可欠なものである．
|
