VARIATION IN THE δ13C VALUE OF TYPICAL PLANTS OF LOESS PLATEAU OVER THE LAST 70 YEARS Study on seasonal variation in carbon isotope composition correspond with soil temperature and humidity and weather factors for main greening tree species Effects of Water Plus Heat Stress on Gas Exchange and Water Use Efficiency in Four Species of Coniferous Seedlings Characteristics of concentrations and carbon isotope compositions of dissolved inorganic carbon in soil water under varying vegetations in karst watershed Effect of Water Conditions on Carbon Isotope Composition, Photosynthesis and Branch Growth of Reaumuria soongorica Seasonal differences in leaf carbon isotope composition among landscaping species of different life forms in Beijing, China Determination of the stable carbon isotope composition in atmospheric carbon dioxide based on plants cultured in bidirectional tracers Coupling Effects of Soil Water and Fertilizer Application on Leaf δ13C of Catalpa bungei Seedlings Correlations Between Foliar Stable Carbon Isotope Composition and Environmental Factors in Desert Plant Reaumuria soongorica (Pall.) Maxim. Relationship between salinity and stable carbon isotope composition of C3 plants