Responses of Baldcypress and Pondcypress Seedlings to Multiple Stresses and Reforestation Implications for Riparian Zones of the Three Gorges Reservoir Region of China Influences of multiple stress by Cd, Pb and Cr on physiological-biochemical characters of wheat seedlings SEASONAL CHANGES IN THE FOLIAR ANTIOXIDANT SYSTEMS IN CYCLOBALANOPSIS HELFERIANA AND TERMINTHIA PANICULATA IN THE HOT-DRY VALLEY OF THE YUANJIANG RIVER, CHINA