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Open AccessArticle

Foliar and Wood Traits Covary along a Vertical Gradient within the Crown of Long-Lived Light-Demanding Species of the Congo Basin Semi-Deciduous Forest

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Laboratory of Wood Technology, Department of Environment, Ghent University, Coupure Links 653, B-9000 Gent, Belgium
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Royal Museum for Central Africa, Service of Wood Biology, Leuvensesteenweg 13, 3080 Tervuren, Belgium
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Faculty of Agricultural Sciences, Department of Natural Resources Management, University of Kinshasa, PO Box 117 Kinshasa XI, Congo
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Center for International Forestry Research, Situ Gede, Sindang Barang, Bogor (Barat) 16115, Indonesia
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Resources & Synergies Development Pte Ltd., Raffles Quay 16, #33-03, Hong Leong Building, Singapore 048581, Singapore
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Meise Botanic Garden, Nieuwelaan 38, 1860 Meise, Belgium
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Faculty of Sciences, Department of Ecology and Fauna Resources Management, University of Kisangani, PO Box 2012 Kisangani, Congo
*
Author to whom correspondence should be addressed.
Forests 2020, 11(1), 35; https://doi.org/10.3390/f11010035
Received: 11 November 2019 / Revised: 19 December 2019 / Accepted: 23 December 2019 / Published: 25 December 2019
(This article belongs to the Special Issue Wood Science and Tropical Forest Ecology)
Plant functional traits have shown to be relevant predictors of forest functional responses to climate change. However, the trait-based approach to study plant performances and ecological strategies has mostly been focused on trait comparisons at the interspecific and intraspecific levels. In this study, we analyzed traits variation and association at the individual level. We measured wood and leaf traits at different height locations within the crown of five individuals of Pericopsis elata (Harms) Meeuwen (Fabaceae) from the northern tropical forest of the Democratic Republic of the Congo. All traits varied between and within individuals. The between-individual variation was more important for leaf traits (23%–48%) than for wood traits (~10%) where the within-individual variation showed to be more important (33%–39%). The sample location height within the crown was found to be the driving factor of this within-individual variation. In a gradient from the base to the top of the crown, theoretical specific hydraulic conductivity and specific leaf area decreased while the stomatal density increased. We found significant relationships among traits and between wood and leaf traits. However, these relationships varied with the position within the crown. The relationship between vessel size and vessel density was negative at the bottom part of the crown but positive upward. Also, the negative relationship between stomatal density and stomatal size became stronger with increasing height within the crown. Finally, the positive relationship between specific leaf area and theoretical specific hydraulic conductivity became stronger in higher parts of the crown, suggesting that P. elata constantly adapts its water use with respect to its water supply, more strongly at the top of the crown where the environment is more extreme and less buffered against environmental fluctuations. View Full-Text
Keywords: Pericopsis elata; wood traits; leaf traits; trait-based ecology; water deficit; tradeoff; tropical rainforest Pericopsis elata; wood traits; leaf traits; trait-based ecology; water deficit; tradeoff; tropical rainforest
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Kafuti, C.; Bourland, N.; De Mil, T.; Meeus, S.; Rousseau, M.; Toirambe, B.; Bolaluembe, P.-C.; Ndjele, L.; Beeckman, H. Foliar and Wood Traits Covary along a Vertical Gradient within the Crown of Long-Lived Light-Demanding Species of the Congo Basin Semi-Deciduous Forest. Forests 2020, 11, 35.

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