Oxygen and hydrogen stable isotope ratios of bulk needles reveal the geographic origin of Norway spruce in the European Alps.

Although the OLS regression was highly significant, we believe that model quality can be further improved, at least for δ 18 O and δ 2 H.

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Contrary to expectations, we did not find either δ 18 O or δ 2 H correlated with altitude, probably because we considered a wide area characterised by fairly significant climatic variability which may have masked the altitude effect.

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