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E-3.2 Effects of Forest Disturbance on Hydro-Meteorological Processes

[Contact Person]

Makoto Tani
Laboratory Chief, Forest Meteorology
Forestry and Forest Products Research Institute
Ministry of Agriculture, Forestry and Fisheries
P.O. Box 16, Tsukuba Norin, Ibaraki, 305-8687, Japan
Tel: +81-298-73-3211, Fax: +81-298-73-1542
Present address: Forest Hydrology Lab.,
School of Agricultural Sciences,
Kyoto University, Kyoto, 606-8502, Japan
Phone +81 75 753 6086 Fax +81 75 753 6088
E-mail: tani@kais.kyoto-u.ac.jp

Total Budget for FY1996-FY1998

47,568 Yen (FY1998: 14,951 Yen)

Abstract

Field studies were conducted in Peninsular Malaysia to predict effects of forest disturbance on hydro-meteorological processes. Four kinds of investigations were carried out in two study sites: l) evapotranspiration and energy budget estimation with a long term meteorological monitoring at an observation tower, 2) an observation of CO₂ flux using" the same tower, 3) a runoff analysis and a comparison of soil hydraulic properties between a forest catchment and a developed rubber plantation area, 4) a survey of soil morphological and chemical properties in catchments where logging and burning are planned The following findings were obtained. 1) An application of a big-leaf model to the estimation results of energy exchange above forest showed that the values of surface conductance were mainly controlled by solar radiation and specific humidity deficit in a wet season. 2) A short-term eddy correlation measurement of CO₂ flux gave Information on a substantial large uptake of CO₂ by the forest. 3) Changes in soil properties such as decreasing of hydraulic conductivity caused by a disturbance suggested that the runoff generation process might change into frequent occurrences of surface runoff. 4) Soil chemical properties distributed in the two study catchments were classified as Acrisols or Cambisols.

[Key Words]

Meteorological Observation, Energy Exchange, CO₂ Uptake, RunoffProcess, Soil Properties