1986 Fiscal Year Final Research Report Summary
Study on the systematic manegement of plantation forests for water resources.
| Project/Area Number |
59440013
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
TSUKAMOTO Yoshinori Tokyo University of Agriculture and Technology, 農学部, 教授 (60014924)
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| Co-Investigator(Kenkyū-buntansha) |
OHTA Takehiko Tokyo University of Agriculture and Technology, 農学部, 助教授 (50134797)
HAIBARA Kikuo Tokyo University of Agriculture and Technology, 農学部, 助教授 (00014960)
OKA Kazuo Tokyo University of Agriculture and Technology, 農学部, 助教授 (70126291)
AIBA Yoshinori Tokyo University of Agriculture and Technology, 農学部, 教授 (00014944)
TANGE Isao Tokyo University of Agriculture and Technology, 農学部, 教授 (90012062)
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| Project Period (FY) |
1984 – 1986
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| Keywords | Water resources / Plantation forest / Tending works / Interception / Hillslope throughflow / Nutrient cycle / 水源かん養機能 |
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| Research Abstract |
The research program consists of the following four subjects to accomplish the research objective. The research results are summerized as follows.
<I> ) Effect of soil characteristics and slope topography on runoff process on hillslopes: Vertical infiltration was analysed by using hydraulic head profile maps. Suction field maps were drawn to analyse the behavior of saturated throughflow. A simulating model on the effect of transpiration on discharge from a hillslope by using Richard's equation showed that transpiration on the lower half slope gives a distinct diurnal fluctuations on hillslope discharge.
<II> ) Effect of forest treatments on water yield: All small watershed experiment data available are grouped with the net radiation of every 10 kcal/ <cm^2> .year. A predicting model of annual water yield increase after forest cutting is presented in these 10 kcal regions. Interception of a matured tree is analysed by a weighing method. The effect of prunning and thinning on interception of Sugi forests is evaluated with plot experiments catching all stemflow, throughflow and canopy drops.
<III> ) Effect of tending works on nutrient cycle and water quality in a experimental watershed: Total discharge of mineral compounds from a forested watershed is highly correlated with water discharge amount, except a few years after forest cutting when cutting affects greatly compound discharge. In paleozoic soils, absorption of magnesium by Sugi trees is slow, while kalium is a quickly rotating compound in a nutrient cycle.
<IV> ) Forest manegement system favourable for water resources: A consistent explanation is attempted for so-called "forest function of uniforming streamflow" basing on the soil-vegetation-runoff relationship. Forest manegement in Hiizumo district was investigated as one of the representative cases of multi-storied forest manegment which is most favourable for water resources and soil erosion.
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