Abstract

The relationship between 180 and deuterium delta values in plant leaves has been studied under laboratory conditions. Our results, in agreement with some earlier studies on fruit juices, show that lines of slope much lower than expected from experiments with evaporating water bodies, are obtained. For needles of Pinus radiata grown under semi-arid conditions, slopes as low as 1.3 were obtained. These low slopes can be reconciled by using a model similar to one developed for lakes subject to evaporation under differing conditions.

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