How does varying water supply affect oxygen isotope variations in needles and tree rings of Scots pine?

Timofeeva G, Treydte K, Bugmann H, Salmon Y, Rigling A, Schaub M, Vollenweider P, Siegwolf R & Saurer M
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Timofeeva, G., Treydte, K., Bugmann, H., Salmon, Y., Rigling, A., Schaub, M., Vollenweider, P., Siegwolf, R., & Saurer, M. (2020). How does varying water supply affect oxygen isotope variations in needles and tree rings of Scots pine? Tree Physiology. https://doi.org/10.1093/treephys/tpaa082