Abstract
Tree-ring characteristics in four species were examined to address whether co-occurring mature trees of different successional status respond differently to drought, and whether saplings of these species have a greater response to drought than mature trees. We examined saplings and mature trees of paper birch, yellow birch, red maple and sugar maple, which varied in successional status (shade-tolerance) and co-occurred at Harvard Forest, Petersham, Mass., USA. Three drought events in 1964–1966, 1981 and 1995 were identified using climate data. For mature trees, there was no significant interspecific difference in relative changes in ring-width index (RWI) during the 1964–1966 and 1995 drought events. However, the interspecific difference was significant in the 1981 drought event. Response function analysis for mature trees showed that the radial growth of sugar maple was mainly controlled by spring and summer precipitation, red maple by spring and summer precipitation and temperature, yellow birch by winter and summer precipitation, and spring and summer temperature, and paper birch by spring and summer precipitation and spring temperature. Saplings of sugar maple and yellow birch, but not red maple and paper birch, showed significant positive correlations between RWI and annual total precipitation. In the 1995 drought event, saplings and mature trees of red maple and paper birch differed significantly in drought responses, but this was not true in sugar maple and yellow birch. Our results do not support a generally greater response in saplings than in mature trees, nor an early- versus late successional difference in drought responses.
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Acknowledgements
The authors wish to thank D. Orwig, and S. Catovsky for stimulating discussions on the subject and reviewing the research proposal, P. Wayne and T. Sipe for offering ideas that were incorporated into this research, T. Wang for conducting response function analysis, and D. Orwig, J. Cavender-Bares, S. Catovsky, D. Flynn and two anonymous reviewers for comments on the previous version of this manuscript. This research was supported by the China State Key Basic Research and Development Plan (Project 2002CB412502) to J.S.H. and Harvard Forest LTER to F.A.B.
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He, JS., Zhang, QB. & Bazzaz, F.A. Differential drought responses between saplings and adult trees in four co-occurring species of New England. Trees 19, 442–450 (2005). https://doi.org/10.1007/s00468-004-0403-2
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DOI: https://doi.org/10.1007/s00468-004-0403-2