Substitution Indexes of Carbon Isotope Discrimination for Spring Wheat THE EFFECT OF SOLL WATER CONDITIONS ON CARBON ISOTOPE DISCRIMINATION AND MINERALS CONTENTS IN SPRING-PLANTED WHEAT Stable carbon isotope variation in plants and their indicating significances along the inland Heihe River basin of northwestern China Response of foliar δ13C of Quercus spinosa to altitudinal gradients Relationship between Carbon Isotope Discrimination and Grain Yield in Spring Wheat Cultivated under Different Water Regimes Genetic Analysis of Carbon Isotope Discrimination and its Relation to Yield in a Wheat Doubled Haploid Population Effects of Alkali Stress on Carbon Isotope Discrimination, Photosynthetic Gas Exchange Parameters and Mineral Element of Three Shrubs Contribution of the ear and the flag leaf to grain filling in durum wheat inferred from the carbon isotope signature: Genotypic and growing conditions effects Relationships among Water Use Efficiency,Carbon Isotope Discrimination,and Specific Leaf Area in Maize