COMPARISON ON THE PHYSIOLOGICAL PARAMETERS OF FIVE YULANIA SPECIES The responses and mechanisms of water use efficiency to different water stresses of three alfalfa varieties Ecophysiological Responses of Seedlings of Hippophae neurocarpa to Elevated Carbon Dioxide Effects of CO2 Concentration on Tall Fescue Drought Resistance and Water Use Efficiency Foliar δ 13C and Nitrogen Use Efficient of Populus deltoides and the Different Growth Vigor F1 Hybrid Clones Transformation of Barnyardgrass (Echinochloa crusgalli) Root Type Phosphoenolpyruvate Carboxylase Gene into Rice (Oryza sativa) Plants and Their Effects on Photosynthesitic Gas Exchange Relations between Stable Carbon Isotope Discrimination and Water Use Efficiency as well as Growth for Poplar Responses of Foliar δ13C Values of Woody Plants to Different Karst Rocky Desertification Degrees in Huajiang Gorge, Guizhou RESPONSES OF PHOTOSYNTHESIS ON WATER STRESS FOR SHRUBS FROM TROPICAL RAIN FOREST AND SUBTROPICAL MONSOON FOREST Difference in δ13C and gas exchange parameters among Populus tomentosa clones The effect of groundwater depth on the δ13C value of constructive species leaf in the lower reaches of the Tarim River A Study on Water Use of Two Fruit Tree-Wheat Intercropping Systems in the Rocky Hilly Region of North China with Stable Carbon Isotope Technique A Study on Foliar Carbon Isotope Composition(δ13C) and Water Use Efficiency of Different Populus deltoides Clones under Water Stress Water Physiological Characteristics of Introduced Alnus formosana