Root architecture and allocation patterns of eight native tropical species with different successional status used in open-grown mixed plantations in Panama |
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Authors: | Lluis Coll Catherine Potvin Christian Messier Sylvain Delagrange |
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Institution: | 1.Centre d’étude de la Forêt (CEF),Université du Québec à Montréal,Montreal,Canada;2.Smithsonian Tropical Research Institute and Department of Biology,McGill University,Montreal,Canada;3.Centre Tecnològic Forestal de Catalunya (CTFC),Solsona,Spain;4.Institut Québécois d’Aménagement de la Forêt Feuillue,Ripon,Canada |
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Abstract: | We investigated biomass allocation and root architecture of eight tropical species with different successional status, as
classified from the literature, along a size gradient up to 5 m. We focused on belowground development, which has received
less attention than aboveground traits. A discriminant analysis based upon a combination of allocational and architectural
traits clearly distinguished functional types and classified species according to successional status at a 100% success rate.
For a given plant diameter, the pioneer species presented similar root biomass compared to the non-pioneer ones but higher
cumulative root length and a higher number of root apices. A detailed study on the root system of a sub-sample of three species
showed that the most late-successional species (Tabebuia rosea) had longer root internodes and a higher proportion of root biomass allocated to the taproot compared to the other two species
(Hura crepitans and Luehea seemannii). Most pioneer species showed a higher leaf area ratio due to a higher specific leaf area (SLA). We conclude that the functional
differences between pioneer and non-pioneer tree species found in natural forests were maintained in open-grown plantation
conditions. |
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Keywords: | Allocation Allometry Root architecture Successional status Tropical plantation |
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