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Keywords = Assamela

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15 pages, 442 KB  
Article
Differential Performance between Two Timber Species in Forest Logging Gaps and in Plantations in Central Africa
by Adeline Fayolle, Dakis-Yaoba Ouédraogo, Gauthier Ligot, Kasso Daïnou, Nils Bourland, Patrice Tekam and Jean-Louis Doucet
Forests 2015, 6(2), 380-394; https://doi.org/10.3390/f6020380 - 2 Feb 2015
Cited by 23 | Viewed by 6878
Abstract
To develop silvicultural guidelines for high-value timber species of Central African moist forests, we assessed the performance of the pioneer Milicia excelsa (iroko, Moraceae), and of the non-pioneer light demander Pericopsis elata (assamela, Fabaceae) in logging gaps and in plantations in highly degraded [...] Read more.
To develop silvicultural guidelines for high-value timber species of Central African moist forests, we assessed the performance of the pioneer Milicia excelsa (iroko, Moraceae), and of the non-pioneer light demander Pericopsis elata (assamela, Fabaceae) in logging gaps and in plantations in highly degraded areas in south-eastern Cameroon. The survival and size of each seedling was regularly monitored in the silvicultural experiments. Differences in performance and allometry were tested between species in logging gaps and in plantations. The two species performance in logging gaps was significantly different from plantations and concurred with the expectations of the performance trade-off hypothesis but not with the expectations of species light requirements. The pioneer M. excelsa survived significantly better in logging gaps while the non-pioneer P. elata grew significantly faster in plantations. The high mortality and slow growth of M. excelsa in plantations is surprising for a pioneer species but could be explained by herbivory (attacks from a gall-making psyllid). Identifying high-value native timber species (i) with good performance in plantations such as P. elata is of importance to restore degraded areas; and (ii) with good performance in logging gaps such as M. excelsa is of importance to maintain timber resources and biodiversity in production forests. Full article
(This article belongs to the Special Issue The 24th IUFRO World Congress: Session 64 What Future for Tropical Silviculture?)
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18 pages, 818 KB  
Article
How Tightly Linked Are Pericopsis elata (Fabaceae) Patches to Anthropogenic Disturbances in Southeastern Cameroon?
by Nils Bourland, François Cerisier, Kasso Daïnou, Alexandre Livingstone Smith, Wannes Hubau, Hans Beeckman, Yves Brostaux, Adeline Fayolle, Achille Bernard Biwolé, Fousséni Fétéké, Jean-François Gillet, Julie Morin-Rivat, Philippe Lejeune, Eric Ntoudé Tiba, Joris Van Acker and Jean-Louis Doucet
Forests 2015, 6(2), 293-310; https://doi.org/10.3390/f6020293 - 29 Jan 2015
Cited by 24 | Viewed by 8526
Abstract
While most past studies have emphasized the relationships between specific forest stands and edaphic factors, recent observations in Central African moist forests suggested that an increase of slash-and-burn agriculture since 3000–2000 BP (Before Present) could be the main driver of the persistence of [...] Read more.
While most past studies have emphasized the relationships between specific forest stands and edaphic factors, recent observations in Central African moist forests suggested that an increase of slash-and-burn agriculture since 3000–2000 BP (Before Present) could be the main driver of the persistence of light-demanding tree species. In order to examine anthropogenic factors in the persistence of such populations, our study focused on Pericopsis elata, an endangered clustered timber species. We used a multidisciplinary approach comprised of botanical, anthracological and archaeobotanical investigations to compare P. elata patches with surrounding stands of mixed forest vegetation (“out-zones”). Charcoal samples were found in both zones, but were significantly more abundant in the soils of patches. Eleven groups of taxa were identified from the charcoals, most of them also present in the current vegetation. Potsherds were detected only inside P. elata patches and at different soil depths, suggesting a long human presence from at least 2150 to 195 BP, as revealed by our charcoal radiocarbon dating. We conclude that current P. elata patches most likely result from shifting cultivation that occurred ca. two centuries ago. The implications of our findings for the dynamics and management of light-demanding tree species are discussed. Full article
(This article belongs to the Special Issue The 24th IUFRO World Congress: Session 64 What Future for Tropical Silviculture?)
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17 pages, 954 KB  
Article
Enrichment of Logging Gaps with a High Conservation Value Species (Pericopsis elata) in a Central African Moist Forest
by Dakis-Yaoba Ouédraogo, Adeline Fayolle, Kasso Daïnou, Charles Demaret, Nils Bourland, Paul Lagoute and Jean-Louis Doucet
Forests 2014, 5(12), 3031-3047; https://doi.org/10.3390/f5123031 - 5 Dec 2014
Cited by 28 | Viewed by 6771
Abstract
In central Africa, most of the timber species require high light at the seedling stage for survival and growth. Forest managers face a regeneration shortage of these light-demanding timber species. To achieve long-term sustainability, there is a need for enrichment methods combining low [...] Read more.
In central Africa, most of the timber species require high light at the seedling stage for survival and growth. Forest managers face a regeneration shortage of these light-demanding timber species. To achieve long-term sustainability, there is a need for enrichment methods combining low cost and high species performance. The aim of this study was to assess the performance of Pericopsis elata seedlings in enriched logging gaps in Cameroon. Over five years; the survival and size of each seedling was monitored in 27 logging gaps that were either left without maintenance or cleared. Gaps were relatively small with an average total area of 155 m2. We found that planted seedlings of P. elata performed well in logging gaps. Even without any maintenance 61% of the planted seedlings survived after five years with an average annual diameter increment of 0.28 cm. P. elata appeared to be a good candidate species for enrichment in logging gaps. We demonstrated that the seedlings of P. elata tolerated a wide range of soil conditions but that their performance was strongly influenced by light availability (gap clearance), suggesting potentially improved performance of P. elata in high light environments such as in plantation or larger gaps. Full article
(This article belongs to the Special Issue The 24th IUFRO World Congress: Session 64 What Future for Tropical Silviculture?)
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