Effects of Soil Water and the Atmospheric COZ Concentration Increase on Evapotranspiration,Photosynthesis,Growth of Wheat,Maize and Cotton Effects of simulated elevated atmospheric CO2 concentration and temperature on soil enzyme activity in the subalpine fir forest Meta-analysis*of*the Response*of*Plant Ecophysiological Variables to Doubled Atmospheric CO2 Concentrations Response of matter production of two winter wheat genotypes with differing nitrogen efficiency to di-atmospheric CO2 concentration and nitrogen supply Experimental Study and Mathematical Simulation of Water Use Efficiency in Wheat Leaves Affected by Some Environmental Factors EFFECTS OF NITROGEN ON THE DRY MATTER ACCUMULATION,CARBON ANDNITROGEN METABOLISM OF WHEAT LEAVES UNDER ELEVATED ATMOSPHERIC CO2 CONCENTRATION The responses of photosynthetic energy use in wheat flag leaves to nitrogen application rates and light density under elevated atmospheric CO2 concentration Relationship between stomata parameters of plants and atmospheric CO2 concentration change A Study on the δ13C Values of Tree Rings and Their Indicative Functions in Revealing Atmospheric CO2 Changes in North China