Wood characterization of Gnidia glauca (Fresen.) gilg (Thymelaeaceae) and its possible utilization as material for pulp production in Northwest Cameroon

S. M. C. Momo, M. L. Avana, J. R. Ngueguim, V. A. Kemeuze

Résumé



Abstract
Over the centuries, paper has been made from a wide variety of materials. Today fiber comes mainly from two sources: wood and recycled paper products. Gnidia glauca bark was used in neighbouring Oku for local paper production. The properties of wood and bark of Gnidia glauca have been less explored in the literature. Therefore, in this study, the anatomical properties were investigated to evaluate the potential utilization of this species especially in pulp and paper production. Sections (transversal, tangential and radial) with a thickness of about 15-30µm were obtained from eight samples and contain phloem, cambial zone and secondary xylem. The sections were stained with 0.1% safranin O. to determine the fiber length and vessel element, we used maceration. Densities of vessels, cambial zone thickness, fiber wall thickness, fiber length were measured in bright-field microscopy images using AnalySIS Pro 3.2 software. The results show that our species contain short wood fiber (1.32 mm in average) while the fiber bark are longer. Gnidia wood fibers are the longest among Ailanthus altissima trunk fiber, wheat straw, canola stalks, cotton stalks and Aspen. Fiber diameter of bark is about twice of those of common papermaking and lumen width is the smallest. Cell wall thickness of Gnidia glauca fiber bark is thicker than those of Gnidia wood and non-wood fibers; consequently, the Runkel ratio is highest (7.35). The flexibility coefficient of Gnidia glauca xylem fibers is 54.51, so it is included in the elastic fibers group while phloem fibers is 12.15 and it is included in the highly rigid fiber. The results of anatomical study of Gnidia glauca show that its xylem fiber dimensions are in the normal range for hardwood and are suitable for paper manufacturing.


Mots-clés


Gnidia glauca; bark; fiber; paper; Cameroon

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