No.111 研究課題 / Project
多摩川流域における二次林の動態とその維持管理に関する研究Study of dynamics and management of secondary quercus serrata forests on Tamagawa River area| 学術研究 Academic Research |
No.111 |
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| 代表研究者 Principal Investigator |
濱谷 稔夫 Toshio Hamaya |
| 所属（採択当時） Affiliation |
東京大学農学部教授 The University of Tokyo |
| 研究内容要約 Research Summary |
多摩川流域の山地帯以下の領域にみられるコナラ林、ミズナラ林などの二次林は、人為的管理下で維持されてきたものであるが、今日では経済林としての価値を失い、特に台地、丘陵部では開発の対象となって著しくその面積を減らしている。 一方、首都圏では、保健休養、環境浄化など森林に対する新たな社会的要請が増大しつつある。従って、これらの二次林の保全あるいは拡大をはかることは現下の緊急の課題である。 本研究は、多摩川流域及びその周辺地域における二次林のうち、都市化の進行に伴って失われつつあるコナラ林について、コナラ実生の発生と消長、落葉掻きや刈取りの実生の生育に与える影響、並びに伐採後の切株からの萌芽の発生状況についてそれぞれ詳細な調査観察を行い、その結果に基づいて、林分構造、人為的管理の影響、伐採後の再生過程等の動態を明らかにし、それによってコナラ林、ひいては二次林全般の維持管理あるいは育成の方策を見出そうとしたものである。 Below the mountain zones lie secondary forests, such as Quercus serrata [Konara oak] and Quercus crispula [Japanese oak] forests. These secondary forests were once maintained by people. However, it is nowadays difficult to expect commercial value from these forests; also, plateaus and hilly areas have been actively reclaimed for development. As a result, these forests have been shrinking dramatically. In urban areas, however, there is a growing demand for forests: for example, as a place for recreation, and from the standpoint of environmental cleanup. Therefore, it is urgently important to preserve or expand these secondary forests. There are several secondary forests in/around the Tamagawa River basin ; this study focused on the Quercus serrata forests, which have shrunk rapidly along with urbanization. More specifically, we carried out field surveys and observations regarding the following points: seasonal variations in the emergence of Quercus serrata seedlings; the effects of the collection of fallen leaves and of the cutting of leaves, on the growth of Quercus serrata seedlings; and the development of new buds from a stump after a Quercus serrata tree has been cut down. Based on these data, we understood the structure of forest stands, the impact of management by people, and the regeneration process of forests after deforestation. Consequently, we discussed ways to preserve or even cultivate Quercus serrata forests, and if possible, other secondary forests. |
| 共同研究者 Collaborators |
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| 研究全文 Full Text |
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