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Vol.6 , No. 2, Publication Date: Jun. 15, 2019, Page: 11-20
 of scientific name "Pericopsis Elata" (Harms), large tree of high commercial value, is an exploited species. It is considered "endangered" by IUCN (International Union for the Conservation of Nature). The operating diameter was set at 100 cm making rare the ready-to-harvest trees. Studies recommended by the Cameroonian government as part of the activities of ITTO/ CITES project, should be made to determine a new minimum operating diameter knowing that the diameter increases with age. No credible solution is provided in the scientific literature to compensate for its scarcity for exploitation. In addition, little or no information is available describing the variation of its physical properties over time in order to find the age for which its wood has good physical properties to be marketable. It is in this context that the present work has been undertaken. In this study, we adopted an experimental approach to evaluate the physical properties of this species exploited in southeastern Cameroon. Then, we studied the variations of these properties according to the age of the tree in order to propose tracks for their exploitation. Thus, tests carried out in the laboratory allowed us to estimate the relationship between the physical properties (Percentage of Heartwood, fiber Saturation Point (FSP), shrinkage, Moisture Content, Anhydrous Density, Basic density) and the Age (or Diameter). For this purpose, after three months of natural drying in the laboratory. We have evaluated the above physical properties with respect to age. This study shows that physical properties change as diameter increases, and change very fast from 65 cm diameter. From the analysis of the experimental data, we deduced that the minimum diameter of the exploitable trees must be equal to 80 cm corresponding to the age of about 200 Years. We can also point out a similarity between these results and some of the literature, according to the complex behaviour of biomaterials.&picture=http://www.aascit.org/aascit/decorators/img/journal/916.jpg)
| [1] | Fouotsa Woutsop Christian Martial, Laboratoire de Mécanique et de Modélisation des Systèmes Physiques (Faculty of Sciences), Department of Physics, University of Dschang, Dschang, Cameroon; Laboratoire d’Ingénierie des Systèmes Industriels et de l’Environnement (IUT-FV), Bandjoun, University of Dschang, Dschang, Cameroon. |
| [2] | Foadieng Emmanuel, Laboratoire de Mécanique et de Modélisation des Systèmes Physiques (Faculty of Sciences), Department of Physics, University of Dschang, Dschang, Cameroon; Higher Technical Teachers' Training College, Kumba, University of BUEA, Cameroon (HTTTC), Kumba, Department of Civil Engineering and Forestry Techniques, University of Buea, Buea, Cameroon; Laboratoire d’Ingénierie des Systèmes Industriels et de l’Environnement (IUT-FV), Bandjoun, University of Dschang, Dschang, Cameroon. |
| [3] | Mtopi Fotso Blaise Eugene, Laboratoire d’Ingénierie des Systèmes Industriels et de l’Environnement (IUT-FV), Bandjoun, University of Dschang, Dschang, Cameroon. |
| [4] | Azeufack Ulrich Gael, Laboratoire de Mécanique et de Modélisation des Systèmes Physiques (Faculty of Sciences), Department of Physics, University of Dschang, Dschang, Cameroon; Laboratoire d’Ingénierie des Systèmes Industriels et de l’Environnement (IUT-FV), Bandjoun, University of Dschang, Dschang, Cameroon. |
| [5] | Talla Pierre Kisito, Laboratoire de Mécanique et de Modélisation des Systèmes Physiques (Faculty of Sciences), Department of Physics, University of Dschang, Dschang, Cameroon. |
| [6] | Fogue Medard, Laboratoire d’Ingénierie des Systèmes Industriels et de l’Environnement (IUT-FV), Bandjoun, University of Dschang, Dschang, Cameroon. |
The assamela (afrormosia) of scientific name "Pericopsis Elata" (Harms), large tree of high commercial value, is an exploited species. It is considered "endangered" by IUCN (International Union for the Conservation of Nature). The operating diameter was set at 100 cm making rare the ready-to-harvest trees. Studies recommended by the Cameroonian government as part of the activities of ITTO/ CITES project, should be made to determine a new minimum operating diameter knowing that the diameter increases with age. No credible solution is provided in the scientific literature to compensate for its scarcity for exploitation. In addition, little or no information is available describing the variation of its physical properties over time in order to find the age for which its wood has good physical properties to be marketable. It is in this context that the present work has been undertaken. In this study, we adopted an experimental approach to evaluate the physical properties of this species exploited in southeastern Cameroon. Then, we studied the variations of these properties according to the age of the tree in order to propose tracks for their exploitation. Thus, tests carried out in the laboratory allowed us to estimate the relationship between the physical properties (Percentage of Heartwood, fiber Saturation Point (FSP), shrinkage, Moisture Content, Anhydrous Density, Basic density) and the Age (or Diameter). For this purpose, after three months of natural drying in the laboratory. We have evaluated the above physical properties with respect to age. This study shows that physical properties change as diameter increases, and change very fast from 65 cm diameter. From the analysis of the experimental data, we deduced that the minimum diameter of the exploitable trees must be equal to 80 cm corresponding to the age of about 200 Years. We can also point out a similarity between these results and some of the literature, according to the complex behaviour of biomaterials.
Keywords
Assamela, Pericopsis Elata, Physical Properties, Hygroscopy, FSP, Shrinkage, Density
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