Stomatal or non-stomatal limitation of photosynthesis of spring wheat flag leaf at late growth stages under natural conditions in semiarid rainfed regions Seasonal Changes in Photosynthetic Characteristics of Ammopiptanthus mongolicus Diurnal variation in net photosynthetic rate and influencing environmental factors of Elaeagnus mollis Diels leaf Effects of Molybdenum on Photosynthetic Characteristics in Winter Wheat under Low Temperature Stress Growth and photosynthesis characteristics of wheat (Triticum aestivum L.) under arsenic stress condition Effects of Cadmium Stress on Leaf Photosynthesis and Dry Matter Allocation of Populus×euramericana (Dode)Guineir cv.‘Neva’ CO2 DIFFUSIONAL AND STOMATAL LIMITATIONS OF PHOTOSYNTHESIS IN AMOMUM VILLOSUM STUDY ON GAS EXCHANGE CHARACTERISTICS OF PHRAGMITES COMMUNIS TRIN. IN DIFFERENT ECOTYPES OF DRY DESERT OF THE HEXI CORRIDOR