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Intrinsic water use efficiency (WUE i ) in trees is an indication of the ratio of carbon assimilation to the rate of transpiration. It is generally assumed that it is a response to water availability. In agricultural research, the question of drought tolerance by increased WUE i has been well studied. In general, the increase is a trade-off for productivity and is therefore not desired. For forest trees, this question is less clearly understood. Using stable carbon isotopes derived from treedoi:10.3390/f7120296 fatcat:do5uvjvwqveohghe2qkvmdwttm