Size-dependent responses to summer drought in Scots pine, Norway spruce and common oak |
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Authors: | Christian Zang Hans Pretzsch and Andreas Rothe |
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Institution: | (1) Ecoclimatology, Technische Universit?t M?nchen, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany;(2) Institute of Advanced Studies, Technische Universit?t M?nchen, Lichtenbergstra?e 2a, 85748 Garching, Germany;(3) Forest Growth and Yield Science, Technische Universit?t M?nchen, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany;(4) Faculty for Forestry, University of Applied Sciences Weihenstephan-Triesdorf, Hans-Carl-von-Carlowitz-Platz 3, 85354 Freising, Germany |
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Abstract: | In this study, we provide a detailed analysis of tree growth and water status in relation to climate of three major species
of forest trees in lower regions of Bavaria, Southern Germany: Scots pine (Pinus sylvestris), Norway spruce (Picea abies) and common oak (Quercus robur). Tree-ring chronologies and latewood δ13C were used to derive measures for drought reaction across trees of different dimensions: growth reduction associated with
drought years, long-term growth/climate relations and stomatal control on photosynthesis. For Scots pine, growth/climate relations
indicated a stronger limitation of radial growth by high summer temperatures and low summer precipitation in smaller trees
in contrast to larger trees. This is corroborated by a stronger stomatal control on photosynthesis for smaller pine trees
under average conditions. In dry years, however, larger pine trees exhibited stronger growth reductions. For Norway spruce,
a significantly stronger correlation of tree-ring width with summer temperatures and summer precipitation was found for larger
trees. Additionally, for Norway spruce there is evidence for a change in competition mode from size-asymmetric competition
under conditions with sufficient soil water supply to a more size-symmetric competition under dry conditions. Smaller oak
trees showed a weaker stomatal control on photosynthesis under both dry and average conditions, which is also reflected by
a significantly faster recovery of tree-ring growth after extreme drought events in smaller oak trees. The observed patterns
are discussed in the context of the limitation-caused matter partitioning hypothesis and possible species-specific ontogenetic
modifications. |
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