Abstract:

From April to October of 2001, the standard trees of a 31 years old Pinus tabulaeformis and Quercus variabilis mixed stand were studied on its specific conductivity using thermal dissipation technology, and 13 environmental factors in western mountain area of Beijing were measured simultaneously. The results showed that the specific conductivity of P. tabulaeformis and Q. variabilis had obvious change law in standard day, and that of Q. variabilis was always higher than that of P. tabulaeformis. The factors that influence specific conductivity of trees could basically be divided into two types: the genetic characteristics and environmental factors. The function of environmental factors on specific conductivity of two tree species was not the same. Even for the same tree species, the environmental factors that have eminent influence on specific conductivity were not the same. Generally, we could accurately model the change of specific conductivity using a few important environmental factors.

Key words: Pinus tabulaeformis, Quercus variabilis, specific conductivity, thermal dissipation technology