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Crown hollowing as a consequence of early shedding of leaves and shoots

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Abstract

Leafing pattern has long been considered as an important element characterizing the growth strategy of tree species; however, the consequences of leafing pattern for tree-crown formation have not been fully understood. To address this issue, the dynamic events (growth, birth, and death) of current-year shoots and leaves were investigated together with their location in saplings of a pioneer tree, Alnus sieboldiana. The leafing pattern was characterized by successive emergence and shedding of short-lived leaves. The combination of successive leafing and within-crown variation in leaf production brought about characteristic outcomes in crown morphology. In the outer crown, because of continuous leaf production, the shoots achieved great extension and enormous daughter shoot production, resulting in rapid expansion of the crown. In contrast, in the inner crown, due to early termination of leaf production, the shoots completely lost their leaves early in the growing season and consequently themselves died and were shed within the season. Such quick shedding of shoots caused “crown hollowing”, i.e., the interior crown consisted of primary branches with little secondary development or foliage. These dynamic features are an effective adaptive strategy in early succession but also may be a disadvantage to maintaining foliage for longer period. Crown maintenance associated with the longevity of structural components is thought to play an important role in survival strategy of tree species.

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Acknowledgments

We thank Maki Suzuki for valuable discussions on this work. We also thank Adriano Dal Bosco and Martin J. Lechowicz for useful comments on this manuscript, Atsushi Takayanagi, Michimasa Yamasaki and other members of the Laboratory of Forest Biology, Kyoto University for helpful comments and suggestions, and Iwao Kojima and other staffs of CER for field assistance. This work was supported by the Japanese Ministry of Education and Science #11213202 and #12304047.

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Correspondence to Hiroyuki Shirakawa.

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Shirakawa, H., Kikuzawa, K. Crown hollowing as a consequence of early shedding of leaves and shoots. Ecol Res 24, 839 (2009). https://doi.org/10.1007/s11284-008-0555-4

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Keywords

  • Alnus sieboldiana
  • Crown maintenance
  • Leaf longevity
  • Stem longevity
  • Successive leafing