Caractérisation de la compétition et de la croissance de Pericopsis elata (Harms) Van Meeuven dans les plantations de la Réserve Forestière de Deng-Deng (Est, Cameroun)
Bibliographic record
Abstract
Pericopsis elata est une espèce ligneuse à grande valeur commerciale menacée d’extinction. Les plantations d’Assamela installées dans la Réserve Forestière de Deng-Deng en 1974 ont été abandonnées après leur mise en place. Dès lors, très peu de connaissances relatives au développement de ces peuplements sont disponibles. L’objectif de la présente étude est de contribuer à la compréhension des conditions de croissance de Pericopsis elata dans la réserve et induire un aménagement efficace. Trois inventaires exhaustifs ont été conduits, au cours desquels les données dendrométriques et structurales ont été collectées. Les indices de compétition de Hegyi, les semi-variogrammes et la distribution spatiale des tiges ont été analysés et interprétés. Les densités actuelles sont sans effet limitant pour la croissance des tiges. Les effets du milieu se révèlent comme étant le facteur qui a plus d’impact sur la croissance des tiges de Pericopsis elata. La plantation de recrû (33,21 cm), moins sensible à l’effet de la densité en termes de croissance comparée aux plantations des grands layons (26,91 cm et 26,89 cm), enregistre les meilleures performances de croissance en diamètre. Ainsi, des travaux d’entretien et des éclaircies portées vers une réduction considérable des compétitions interspécifique et intra spécifique sont nécessaires.Mots clés : Indice de Hegyi, méthodes sylvicoles, modes de compétition, plantations équiennes, semi-variogramme, Cameroun.
 
 English Title: Characterization of the competition and growth of Pericopsis elata (Harms) Van Meeuven in the plantations of the Deng-Deng Forest Reserve (East, Cameroon)Pericopsis elata is a valuable woody species threatened with extinction. The Assamela plantations established in the Deng-Deng Forest Reserve in 1974 were abandoned after their establishment. As a result, very little knowledge about the development of these stands is available. The objective of the present study is to contribute to the understanding of the growing conditions of Pericopsis elata in the Reserve and to induce proper management. Three exhaustive inventories were conducted, during which dendrometric data were collected. Hegyi’s competition indices, variograms and spatial distribution of stems were developed. Current densities have no limiting effect on stem growth. Environmental effects were found to be the factor that had the greatest impact on the growth of Pericopsis elata stems. The recruiting plantation (33.21 cm), which is less sensitive to the effect of density in terms of growth compared to the large layon method (26.91 cm and 16.89 cm), has the best growth in diameter performance. Thus, maintenance work and thinning leading to a considerable reduction in interspecific and intraspecific competition is necessary.Keywords: Regular plantations, Hegyi’s competition index, mode of competition, Silvicultural methods, semi-variogram, Cameroon.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.002 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".