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We investigated the physiological responses of Tibetan juniper (Sabina tibetica) to changes in the atmospheric CO2 concentration (Ca) and climate on the northeastern Tibetan Plateau based on annual tree-ring δ13C values since 1850. Intrinsic water-use efficiency (iWUE) increased, and the internal to ambient CO2 ratio (Ci/Ca) showed no significant trend from 1895 to 1974 in the study region, indicating...
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