Abstracts for the 6th International GAME Conf.
3-5 December 2004
Kyoto Japan
Characteristics of roughness parameters in boreal, cool-temperate and warm-temperate forests
Taro NAKAI (1), Takashi KUWADA (1), Yuji KODAMA (3), Takeshi OHTA (4), Trofim C. Maximov (5)
(1) Japan Science and Technology Agency
(3) Institute of Low Temperature Science, Hokkaido University
(4) Graduate School of Bioagricultural Sciences, Nagoya University
(5) Institute for Biological Problems of the Cryolithozone, Siberian Division of Russian Academy of Sciences, Yakutsk 677891, Russia
Roughness parameters, such as zero-plane displacement (d) and roughness length (z0), are necessary factors to estimate transportation of heat, water, and scalar gasses (CO2, etc.) through aerodynamic resistance in Penman-Monteith equation or atmospheric stability function. These parameters are related to forest structure factors (LAI, stand density, etc.), and their relationships are needed for estimation of plant-physiological factors in wide-scale area of boreal forest by using satellite data. In this study, roughness parameters are compared among boreal forest (Yakutsk, Russia), cool-temperate forest (Moshiri, Japan), and warm-temperate forest (Seto, Japan). The boreal forest consists of larch (deciduous conifer), the cool-temperate forest is occupied by birch (deciduous broadleaved trees), and the warm-temperate forest is a mixed forest of deciduous and evergreen broad-leaved trees. In the case of September 2003, normalized zero-plane displacement (d/h) of the boreal forest was small (0.61) compared with the cool-temperate (0.79) and the warm-temperate forests (0.66), where h is tree height. On the other hand, normalized roughness length (z0/h) of the boreal forest was larger (0.12) than the cool-temperate (0.05) and the warm-temperate forests (0.10). These results are due to the low stand density of the boreal forest (820 stands ha-1) compared with the cool temperate (4,000 stands ha-1) and the warm-temperate forests (1,828 stands ha-1).
Submittal Information
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Japan Science and Technology Agency | |
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Institute of Low Temperature Science, Hokkaido University, Sapporo, 060-0819 | |
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taro@pop.lowtem.hokudai.ac.jp | |