The limited importance of size-asymmetric light competition and growth of pioneer species in early secondary forest succession in VietnamReportar como inadecuado




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Oecologia

, Volume 157, Issue 1, pp 1–12

First Online: 15 May 2008Received: 14 September 2007Accepted: 13 April 2008

Abstract

It is generally believed that asymmetric competition for light plays a predominant role in determining the course of succession by increasing size inequalities between plants. Size-related growth is the product of size-related light capture and light-use efficiency LUE. We have used a canopy model to calculate light capture and photosynthetic rates of pioneer species in sequential vegetation stages of a young secondary forest stand. Growth of the same saplings was followed in time as succession proceeded. Photosynthetic rate per unit plant mass Pmass: mol C g day, a proxy for plant growth, was calculated as the product of light capture efficiency Φmass: mol photosynthetic photon flux density PPFD g day and LUE mol C mol PPFD. Species showed different morphologies and photosynthetic characteristics, but their light-capturing and light-use efficiencies, and thus Pmass, did not differ much. This was also observed in the field: plant growth was not size-asymmetric. The size hierarchy that was present from the very early beginning of succession remained for at least the first 5 years. We conclude, therefore, that in slow-growing regenerating vegetation stands, the importance of asymmetric competition for light and growth can be much less than is often assumed.

KeywordsCanopy model Light capture Photosynthesis Regeneration Tropical forest Communicated by Robert Pearcy.

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Autor: Marijke van Kuijk - N. P. R. Anten - R. J. Oomen - D. W. van Bentum - M. J. A. Werger

Fuente: https://link.springer.com/



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