Pinus tabulaeformis and Platycladus orientalis are two different types of drought tolerant tree species. In order to further understand the mechanisms of water transportation and drought tolerance, the present study, using the basic theory of hydraulic architecture, measured and analyzed the hydraulic architecture parameters of P. tabulaeformis and P. orientalis seedlings (4 years old) using improved flushing method with normal water supply. The results showed that both P. tabulaeformis ...