2023 Fiscal Year Final Research Report
Mapping of high-resolution forest structure and water balance analysis for a century in a suburban watershed area
| Project/Area Number |
19K06345
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 41050:Environmental agriculture-related
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| Research Institution | Tokyo University of Agriculture |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
泉 桂子 岩手県立大学, 総合政策学部, 教授 (10457898)
下嶋 聖 東京農業大学, 地域環境科学部, 准教授 (60439883)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | 水資源 / 水収支 / 多摩川源流域 / 蒸発散 / 森林 |
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| Outline of Final Research Achievements |
We verified a forestry survey method to understand the changes in forest structure in a water source forest at the dawn of time, and were able to analyze it by combining historical data on forest products and mapping using GIS. We also clarified the characteristics of tree trunk interception and evapotranspiration as water balance in young larch plantation forests as a component of the Tama River headwaters area. At the same time, rainfall-runoff characteristics were clarified in the Karikurasawa watershed in the headwaters of the Tama River, taking into account the base rock topography. In addition, we succeeded in extracting bare and logged areas by mapping the land cover change in the watershed area at various periods of time using colorized aerial photographs of a part of the Tama River headwaters.
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| Free Research Field |
森林科学
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| Academic Significance and Societal Importance of the Research Achievements |
これまで首都東京の水資源保全を念頭に，多摩川源流域において水収支の解明を目的として研究を進めてきた。
本研究では，黎明期の東京都水源林における林分構造の変遷を把握するための林政学的調査手法を検証すること，さらには多摩川源流域における構成林分の水収支を解明することによって一つの流域における長期間の構成林分における水収支の変化を捉えられる手法を明らかにすることができた。さらには多時期における対象流域の土地被覆変遷をマッピング化し，それらの画像解析から各時期の裸地・伐採地を抽出したうえで，その分布図を作成することに成功した。
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