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[B-12.2.2 Effects of the global warming on the vegetation on a humid tropical mountain]

[Contact Person]

Kanehiro Kitayama
Overseas Forest-Environment Research Team, The Japanese
Forestry and Forest Products Research Institute,
1 Matsunosato, Kukizaki, Inashiki-gun, Ibaraki 305 , Japan
Tel, +81-298-73-3211 ext. 248; Fax, +81-298-73-1541
E-mail, kanehiro@ffpri.affrc.go.jp

[Total Budget for FY1995]

9,241,000 Yen

[Abstract]

　Soil nitrogen mineralization rates and leaf longevity of woody species were investigated at various altitudes on a wet slope of Mount Kinabalu, Borneo. N mineralization rates of the soils derived from sedimentary and ultrabasic rocks significantly changed as a function of temperature. An estimated temperature coefficient was 1.7 for sedimentary soil, but was much less for ultrabasic soil. It appears that effects of global warming are contrasting between the substrates with less effects on ultrabasic soils. It also appears that effects are greater in warmer lowland than in cooler upland.Nearly all trees were evergreen on Kinabalu. Leaf longevity, however, greatly varied among species from >1yr to<1yr at a given altitude. The longevity of the wide-ranging species Schima wallichii increased with altitude. These trends in longevity were consistent with a prediction model.

[Key Words]

net N mineralization potential, temperature coefficient, tropical mountain, phenology, leaf longevity