Abstract
We applied dendroclimatological techniques to determine long-term stationarity of climate–growth relationships and recent growth trends of three widespread coniferous tree species of the central Austrian Alps, which grow intermixed at dry mesic sites within a dry inner Alpine environment (750 m asl). Time series of annual increments were developed from >120 mature trees of Picea abies, Larix decidua and Pinus sylvestris. Calculation of response functions for the period 1911–2009 revealed significant differences among species in response to climate variables. While precipitation in May–June favored radial growth of P. abies and L. decidua, P. sylvestris growth mainly depended on April–May precipitation. P. abies growth was most sensitive to May–June temperature (inverse relationship). Moving response function coefficients indicated increasing drought sensitivity of all species in recent decades, which is related to a decline in soil moisture availability due to increasing stand density and tree size and higher evapotranspiration rates in a warmer climate. While recent trend in basal area increment (BAI) of L. decidua distinctly declined implying high vulnerability to drought stress, moderately shade-tolerant P. abies showed steadily increasing BAI and quite constant BAI was maintained in drought-adapted P. sylvestris, although at the lowest level of all species. We conclude that synergistic effects of stand dynamics and climate warming increased drought sensitivity, which changed the competitive strength of co-occurring conifers due to differences in the inherent adaptive capacity.
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Acknowledgments
This work was supported by the Austrian Science Fund (FWF Project No. P22280-B16 “Conifer radial stem growth in response to drought”). We thank Julia Mennel for help with measurement of tree-ring width and Sergio Rossi for the discussion. We greatly acknowledge Hydrographischer Dienst, Innsbruck, for providing us the climate data.
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Schuster, R., Oberhuber, W. Drought sensitivity of three co-occurring conifers within a dry inner Alpine environment. Trees 27, 61–69 (2013). https://doi.org/10.1007/s00468-012-0768-6
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DOI: https://doi.org/10.1007/s00468-012-0768-6