Stable Carbon Isotopic Compositions of C_3 Plant Responses to the Temperature and Moisture and their Application in Water Use Efficiency

Stable carbon isotopic composition(δ13C value) of land plant can reveal large amount of information included physical,chemical,metabolic,climatological and environmental messages in the process of terrestrial ecosystem carbon cycle.As an important indicator in assessing plant physiological function,foliar δ13C value can be used to study the relationships between plant physiology and ecological environment.Generally,temperature,humidity and other environmental factors can influence leaf stomatal conductance and intercellular CO2 concentration,and then foliar δ13C value.The foliar δ13C value of C3 plant is positively related to water use efficiency(WUE) and which can be considered as an indicator to measure the level of WUE.The article reviews the effect of temperature and moisture on foliar δ13C value and its application in water use efficiency.