Variation in tree growth sensitivity to moisture across a water-limited forest landscape |
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| Institution: | 1. Prairie Adaptation Research Collaborative, 2 Research Dr., Regina, SK, S4S 0A2, Canada;2. Department of Biology, University of Regina, 3737 Wascana Parkway, Regina S4S 0A2 Canada;3. Department of Geography, University of Regina, 3737 Wascana Parkway Regina S4S 0A2 Canada;1. Instituto Pirenaico de Ecología (IPE-CSIC), Avda. Montañana 1005, 50192, Zaragoza, Spain;2. Centro de Interpretación Espacio Salto de Roldán, Ctra. Sabayés s/n, 22150, Huesca, Spain;1. Chair of Silviculture, University of Freiburg, Tennenbacherstraße 4, 79085 Freiburg, Germany;2. Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Dübendorf, Switzerland;3. Chair of Forest Growth and Yield Science, Technical University of Munich, Hans-Carl-v.-Carlowitz-Platz 2, 85354 Freising, Germany;4. Chair of Forest Growth and Dendroecology, University of Freiburg, Tennenbacherstraße 4, 79085 Freiburg, Germany;1. Department of Gastroenterology, AP-HP, Hôpital Saint-Antoine F-75012 and UPMC Univ Paris 06, F-75005 Paris, France;2. Gastroenheden D, Herlev and Gentofte Hospital, University of Copenhagen, Denmark;3. Department of Gastroenterology, Zealand University Hospital, Køge, Denmark;4. Department of Paediatric Gastroenterology, AP-HP, Hôpital Necker-Enfants Malades, Paris, BP, France;1. Department of Biology, University of Regina, Regina, SK, Canada;2. Department of Computer Science, Lakehead University, Thunder Bay, ON, Canada |
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| Abstract: | Water availability acts as a major constraint on productivity in many sub-humid forest regions. Precipitation can be an important limiting factor for tree growth in such areas, but the strength of the relationship can vary by habitat and species, as well as with tree size and local hydrology. We quantified the influence of past weather conditions on the growth of two conifer species (Pinus contorta and Picea glauca) across a water-limited forest landscape in western Canada. The two species differ in moisture requirements and are segregated across a local elevational gradient, and so we expected them to exhibit different sensitivities to precipitation. We also expected that larger trees and those more distant from creeks would have a stronger response to precipitation. A hierarchical Bayesian model fit to the annual ring widths of 387 trees showed that historical precipitation from 1951 to 2016 had a positive overall effect on radial growth. The magnitude of precipitation effects on radial tree growth varied with creek proximity (a proxy for the soil moisture provided by an elevated water table in the valley bottom) and tree size. Precipitation had a greater positive influence on the growth of larger P. glauca trees, as well as individuals of both species at far and intermediate distances from creeks. Precipitation had a weaker but still positive effect on P. glauca trees growing close to creeks. Tree growth rates may change with the predicted greater inter-annual variability of precipitation under climate change, but the magnitude of these responses appear to vary by species, size, and creek proximity. Overall changes in tree growth are expected to be relatively small as trees are well-adapted to cope with the variation in water availability across a moisture-limited landscape. |
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| Keywords: | Climate Growth Hydrology Moisture Tree size |
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