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Crown plasticity reduces inter-tree competition in a mixed broadleaved forest

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Abstract

The objective of the study was to analyse to which extent horizontal crown plasticity reduces inter-tree competition at stand scale, and how it relates to species growth strategy. Two components of crown plasticity defined at the individual tree level (crown shape distortion, CSD and crown displacement relative to stem, CRD) were analysed and their relative importance in the reduction of competition was quantified. Inter-tree competition at stand scale was estimated using spatial pattern analysis and crown overlap estimation. Measurements were performed in a mixed broadleaved stand of Western Europe. Crown plasticity was shown to regularise the spatial distribution of crowns in comparison with the corresponding stems and to reduce inter-tree competition by optimising space occupation. A significant reduction in crown overlap was observed, mainly due to CRD and secondarily to CSD. At the species level, CSD and CRD were positively correlated. In addition, both were negatively correlated with species shade-tolerance scores. In particular, three European temperate tree species showed contrasting responses, which were related to their known specific ecological strategies. Fagus sylvatica, known to be a highly shade-tolerant species, showed large crowns, low CSD and CRD, indicating a low plasticity and suggesting a strong competitive ability. At the opposite, Quercus sp., known to be clearly less shade-tolerant, exhibited a reduced growth, associated with high CSD and CRD, indicating high crown plasticity and probably a lower competitive ability. For this species, plasticity could be described as passive. Last, Carpinus betulus, known to have a relatively good shade-tolerance, showed a contrasting behaviour with high CSD and CRD and a strong presence in the stand, suggesting high crown plasticity and a good competitive ability. In that case, plasticity was described as rather adaptive.

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Acknowledgments

The authors thank Bruno Garnier, Michel Pitsch and Léon Wehrlen for assistance in the field. Thanks are also extended to two anonymous reviewers for their constructive and helpful comments on an earlier manuscript.

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Correspondence to Fleur Longuetaud.

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Communicated by A. Weiskittel.

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Longuetaud, F., Piboule, A., Wernsdörfer, H. et al. Crown plasticity reduces inter-tree competition in a mixed broadleaved forest. Eur J Forest Res 132, 621–634 (2013). https://doi.org/10.1007/s10342-013-0699-9

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  • DOI: https://doi.org/10.1007/s10342-013-0699-9

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