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Flooding alters apparent position of floodplain saplings on a light gradient

Hall, R. B. W. ; Harcombe, P. A.

Ecology (Durham), 1998-04, Vol.79 (3), p.847-855 [Periódico revisado por pares]

Washington, DC: Ecological Society of America

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Título:
Flooding alters apparent position of floodplain saplings on a light gradient
Autor: Hall, R. B. W. ; Harcombe, P. A.
Assuntos: Animal and plant ecology ; Animal, plant and microbial ecology ; Big Thicket National Preserve ; Biological and medical sciences ; BOSQUES ; bottomland ; BOTTOMLAND FORESTS ; direct gradient analysis ; Ecology ; flood tolerance ; FLOODED LAND ; FLOODING ; floodplain ; Floodplains ; Floods ; Forest canopy ; Forest ecology ; Forest management. Stand types and stand dynamics. Silvicultural treatments. Tending of stands. Natural regeneration ; Forest regeneration ; Forestry ; FORESTS ; FORET ; Fundamental and applied biological sciences. Psychology ; GERMINACION ; GERMINATION ; INONDATION ; INUNDACION ; light ; LIGHT AVAILABILITY ; LIGHT REGIMES ; NATURAL REGENERATION ; Neches River ; Ordination ; Plant growth ; PLANTULAS ; PLANTULE ; REGENERACION NATURAL ; regeneration ; REGENERATION NATURELLE ; REGIME LUMINEUX ; REGIMENES DE LUZ ; Saplings ; SEEDLINGS ; Shade tolerance ; Species ; Stand types and stand dynamics. Silvicultural treatments. Tending of stands. Natural regeneration ; SUPERVIVENCIA ; SURVIE ; SURVIVAL ; Synecology ; TERRE INONDEE ; Terrestrial ecosystems ; TEXAS ; TIERRAS INUNDADAS ; Trees
É parte de: Ecology (Durham), 1998-04, Vol.79 (3), p.847-855
Notas: F60
K01
1997072918
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SourceType-Scholarly Journals-1
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Descrição: It has been hypothesized that flooding, interacting with light availability, can determine spatial patterns of tree regeneration by causing differential germination or survival among seedlings in river floodplains. We conducted a canonical correspondence analysis (CCA, a form of direct gradient analysis) of sapling and environmental data collected from 1980 to 1990 to investigate this hypothesis. The CCA recovered two significant axes, and of the eight environmental variables included, only elevation and percentage sky explained significant portions of the variability in species location. Axis 1 was correlated with elevation, while Axis 2 was correlated with percentage sky. Comparison of first axis rankings with species flood tolerance rankings obtained from the literature showed substantial agreement, indicating that elevation was a surrogate for flood tolerance. Comparison of second axis rankings with species shade tolerance rankings obtained from the literature showed little correspondence between position on the light gradient and species shade tolerance rankings; several of the most shade-tolerant species were placed on the high-light end of the light gradient. These results suggest that sapling distributions are responding primarily to flooding and light. The failure of the species to assort along the light gradient in accordance with their shade tolerance suggests that flooding interacts with life history traits of individual species, especially shade tolerance, resulting in complex species-specific responses. When we attempt to tease apart the interaction between light and flooding, we find two components: flood tolerance may allow persistence of some species under lower light conditions than normal, and flood intolerance may limit some normally shade-tolerant species to high-light conditions, where growth is fast enough to allow escape from the flooding hazard.
Editor: Washington, DC: Ecological Society of America
Idioma: Inglês

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Flooding alters apparent position of floodplain saplings on a light gradient

Hall, R. B. W. ; Harcombe, P. A.

Washington, DC: Ecological Society of America

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