The salinity-adaptation physiology in different ecotypes of Phragmites communis in the Yellow River Delta Ⅱ.the characteristics of photosynthetic gas exchange in different ecotypes of Phragmites communis ENZYMATIC ACTIVITY OF ROOT QUALITIES IN PURPLE-FLESHED SWEETPOTATO UNDER FLIED SHADING STRESS Investigation on the Adaptation of Photosynthetic Carbon Metabolism Pathway to Environment of Phragmites communis in Hexi Corridor of Gansu Province Effects of different accumulated temperature on photosynthetic performances of spring maize varieties during grain-filling period. Effects of Low Temperature and Low Light Intensity Stress on Photosynthesis in Seedlings of Different Cucumber Varieties Effects of Low Temperature and Low Light Intensity Stress on Photosynthesis in Seedlings of Different Cucumber Varieties The Effects of Sulfur Nutrition on Some Physiological Parameters in Relation to Carbon and Nitrogen Metabolism in Wheat and Maize A preliminary study on C3 and C4 plants in the Northeast stepps and their ecological distribution C4 Pathway Enzymes in Soybean Leaves