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Title of Journal: Trees

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Abbravation: Trees

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Springer Berlin Heidelberg

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DOI

10.1002/jcla.20268

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1432-2285

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Understanding causes of tree growth response to ga

Authors: P van der Sleen C C SolizGamboa G Helle T L Pons N P R Anten P A Zuidema
Publish Date: 2013/12/03
Volume: 28, Issue: 2, Pages: 439-448
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Abstract

The formation of treefall gaps in closed canopy forests usually entails considerable increases in light and nutrient availability for remaining trees as well as altered plant water availability and is considered to play a key role in tree demography The effects of gaps on tree growth are highly variable and while usually stimulatory they may also include growth reductions In most studies the causes of changes in tree growth rates after gap formation remain unknown We used changes in carbon isotope 13C discrimination Δ13C in annual growth rings to understand growth responses after gap formation of Peltogyne cf heterophylla in a moist forest of Northern Bolivia We compared growth and Δ13C of the 7 years before and after gap formation Fortytwo trees of different sizes were studied half of which grew close 10 m to single treefall gaps gap trees the other half more than 40 m away from gaps controls We found variable responses among gap trees in growth and Δ13C Increased growth was mainly associated with decreased Δ13C suggesting that the growth response was driven by increased light availability possibly in combination with improved nutrient availability Most trees showing zero or negative growth change after gap formation had increased Δ13C suggesting that increased water stress did not play a role but rather that light conditions had not changed much or nutrient availability was insufficient to support increased growth Combining growth rates with Δ13C proved to be a valuable tool to identify the causes of temporal variation in tree growthWe thank Carmen Bürger of GeoForschungsZentrum in Potsdam Germany for her help with the analysis of the wood samples Mart Vlam for his assistance during the sampling of wood in growth rings and two anonymous reviewers for their constructive and helpful comments Peter van der Sleen and Pieter Zuidema were supported by the European Research Council ERC grant 242955

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