TY  - JOUR
AU  - Biwolé, A.B.
AU  - Dainou, K.
AU  - Fayolle, A.
AU  - Hardy, O.J.
AU  - Brostaux, Y.
AU  - Coste, S.
AU  - Delion, S.
AU  - Betti, J.L.
AU  - Doucet, J.-L.
PY  - 2015//
TI  - Light Response of Seedlings of a Central African Timber Tree Species, Lophira alata (Ochnaceae), and the Definition of Light Requirements
T2  - Biotropica
JO  - Biotropica
SP  - 681
EP  - 688
VL  - 47
IS  - 6
KW  - biomass allocation
KW  - Central Africa
KW  - light requirement: Lophira alata
KW  - population
KW  - relative growth rate
KW  - seedling growth
KW  - timber species
KW  - Afrique centrale
KW  - allocation de biomasse
KW  - besoins en lumière
KW  - croissance des semis
KW  - bois d'œuvre
KW  - Lophira alata
KW  - taux de croissance relatif
N2  - Light is of primary importance in structuring tropical tree communities. Light exposure at seedling and adult stages has been used to characterize the ecological profile of tropical trees, with many implications in forest management and restoration ecology. Most shade-tolerance classification systems have been proposed based on empirical observations in a specific area and thus result in contradictions among categories assigned to a given species. In this study, we aimed to quantify the light requirements for seedling growth of a Central African timber tree, Lophira alata (Ochnaceae), taking into account effects of population origin. In two controlled experiments: a light response experiment and a comparative population experiment, conducted in southwestern Cameroon, using seeds collected from four populations (three from Cameroon and one from Gabon), we examined the quantitative responses to irradiance of seedlings. After 2 years, mortality was very low (<3%), even in extremely low irradiance. Growth and biomass allocation patterns varied in response to light, with intermediate irradiance (24–43%) providing optimal conditions. Light response differed between populations. The Boumba population in the northeastern edge of the species' distribution exhibited the highest light requirements, suggesting a local adaptation. As a result of positive growth at low irradiance and maximum growth at intermediate irradiance, we concluded that L. alata exhibits characteristics of both non-pioneer and pioneer species. Implications of our results to propose an objective way to assign the light requirement for tropical tree species are discussed.
SN  - 1744-7429
UR  - http://dx.doi.org/10.1111/btp.12258
N1  - exported from refbase (http://php.ecofog.gf/refbase/show.php?record=648), last updated on Thu, 21 Jan 2016 19:47:14 -0300
ID  - Biwole_etal2015
ER  -