Abstract:Carbon isotope composition is mostly determined by the biological characteristic of plants, but the influence of environmental stress is also evident and cannot be ignored. This article discusses the development of studies on the application of carbon isotope technology for water use efficiency (WUE), biomass, past climate; summarizes the response of δ~(13)C in plants to water stress caused by drought, salinity and other environment factors and deduces the responsive mechanism of carbon stable isotope to...