Abstract
The surface conductance of a deciduous secondary forest in Kansai region was estimated during the foliate season. The value of estimated surface conductance rate varied widely in the low vapour pressure deficit condition and converged to a constant (6mm・s^<-1>) when the vapour pressure deficit became high. The cause of the convergence value of 6mm・s^<-1> is supposed due to the large evaporation from the forest floor. The algebraic form of the relative surface conductance for the influence from the solar radiation shows as a hyperbolic curve with a relatively small curvature with those in the other reports. It is thought that it was caused by the transpiration from the leaves located in the relatively low layer of the community and the large evaporation from the forest floor. The difference of these algebraic forms was judged to be effective both in the present forest and the pine forest in U.K.. When the algebraic form of the relative surface conductance for the influence from the air temperature is at the maximum value, the air temperature shows higher than that in the European forests and lower than that in the Amazonian forest. The algebraic form of the relative surface conductance from the vapour pressure deficit was evaluated to be most similar to one in the oak forest in Dutch.
