A STUDY ON EFFECT INTERMTTENT FLOOD UPON THE WOOD PHYSICAL AND MECHANICAL PROPERTIIES OF THE W00D OF TAX 0DIUM ASCENDENS Comparative Studies on Photosynthetic Characteristics off Taxodium distichum and Taxodium ascendens Seedlings under Simulated Soil Water Change in the Hydro-Fluctuation Belt of Three Gorges Reservoir Area Malic Acid, Shikimic Acid, and Biomass Accumulation in the Roots of Taxodium ascendens Seedlings under Different Soil Water Conditions Chemical constituents of Taxodium ascendens The effects of waterlogging on photosynthesis-related eco-physiological processes in the seedlings of Quercus variabilis and Taxodium ascendens Studies on the Diterpenes from the Leaves of Taxodium ascendens(Ⅰ) Photosynthetic Physio-response of Taxodium ascendens Seedlings to Different Soil Water Gradients