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[E-3.1 Microclimatic Formation by Plant Community]

[Contact Person]

Akio Furukawa
Senior Research Official
Global Environment Division, National Institute for Environment Studies,
Environment Agency
16-2, Onogawa, Tsukuba, Ibaraki 305 Japan
Phone 81-298-51-6111(Ext.312), Fax 81-298-51-3471

[Total Budget for FY1990-1992]

21,484,000 Yen

[Abstract]

　The study site was selected in the Pasoh Forest Reserve, Negeri Sembilan, west Malaysia Inside the Pasoh Forest Reserve, a canopy walkway system, two 30m towers and one 40m tower was constructed. Diurnal and seasonal changes in temperature, water vapor pressure deficit and photon flux density were measured using the canopy walkway. The differences of these climatic factors are not Influenced by the seasonality but by the weather conditions of the day of the measurement.
　For the estimation of the seasonality of diameter increases, 192 trees(38 species) were selected. Dendrometers were installed on tree trunks in August, 1991. The estimation of leaf dynamics of five canopy trees were stared to monitor from August, 1992. Among 190 trees, the rate of Increase in diameter of 80 trees was less than 1mm yr^-1 and no increase in diamter was detected in 2 of them. The growth period was different between species and individuas. E. malaccense increased its diameter continuously, while D. sublamellatus and Shorea leprosula showed the periodic increase. From the analyses of the interaction between precipitation and increase in diameter, the slow growing periods were found to be corresponded to low precipitation periods.

[Key Words]

Canopy walk-way, Micro-climate, Diameter Increase, Phenology, Forest Canopy