2002 Annual

Tuesday, 15 January 2002
Parameterization of Jarvis-Stewart model in a deciduous secondary Forest In Japan and comparison with European and Amazon forests
Koji Tamai, Forestry & Forest Products Research Institute, Kyoto, Japan
Jarvis-Stewart model to estimate surface conductance was applied for the forest that had some characteristics such as large evaporation from the floor caused by the large relative solar radiation ratio and continuous distribution of leaves between canopy top and forest floor level. The value of estimated surface conductance varied widely in the low vapour pressure deficit condition and settled to a constant (6mms-1) when the vapour pressure deficit became high. The cause of the large settled value of 6mm s-1 is supposed due to the large evaporation from the forest floor. The algebraic form of the function between solar radiation and surface conductance was evaluated to be the hyperbolic curve that has a smaller curvature than that in other studies. On the other hand, the form of the function between vapor pressure deficit and surface conductance was evaluated to be almost constant and smaller. These were caused by the transpiration from leaves located in the lower height and the large evaporation from the forest floor. The parameter of the function between air temperature and surface conductance was identified to be larger and smaller than that in European forests and Amazonian forest, respectively.

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