2007 Fiscal Year Final Research Report Summary
Characteristics of spatial distribution in micro meteorological factors and evapotranspiration on hills-lopes
| Project/Area Number |
17380088
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
林学・森林工学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SUZUKI Masakazu The University of Tokyo, Graduate school of Agriculture and Life Sciences, Professor (10144346)
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| Co-Investigator(Kenkyū-buntansha) |
SHUIN Yasuhiro Utsunomiya University, Faculty of Agriculture, Associate Professor (60221305)
HOTTA Norifumi The University of Tokyo, Graduate school of Agriculture and Life Sciences, assistant (00323478)
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| Project Period (FY) |
2005 – 2007
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| Keywords | micro meteorology / complex topography / vertical temperature profile / CO2 Concentration / Spatial distribution |
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| Research Abstract |
To analyze spatial distribution in tree growth, evapotranspiration and micro meteorological factors on hills-lopes, micrometeorological field observations have been conducted in the University Forest in Chiba, Japan, and the Kog-Ma watershed in northern Thailand.
We have conducted measurement of tree height, diameter, leaf nitrogen content, soil moisture, groundwater level and soil nitrogen content at a transect line crossing a valley in a 5 years old Sugi (Criptomeria japonica) stand in Chiba. Tree growth near valley bottom is larger than on ridge. The reason of this trend is not because of water stress on ridge but because of rich nutrient condition which caused by nitrogen supply associated with active decomposition of organic matter in humid soil near valley.
At Kog-Ma experimental watershed situated 1265m above sea level and covered by a hill evergreen forest, vertical distribution of wind speed and air temperature in and above canopy have been measured using a 50m tower. Nocturnal drainage flow occurs frequently in this forest slope and wind speed profiles in night are classified by the bulk Richardson number. On vertical temperature profile, conditions of the height of minimum temperature in the morning appeared at canopy or forest floor also classified by stability of atmosphere caused by the effect of nocturnal drainage flow.
These measurements reveille distribution of micrometeorological and hydrological factors along forested slope effect on the difference between the ridge and the bottem of the slope in evapotranspiration and carbon cycle.
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Research Products
(9 results)
