scholarly journals Reducing Warp and Checking in 4 by 4 Beams from Small-Diameter Tropical Species (Tectona grandis,Gmelina arborea,andCordia alliodora) Obtained by Turning the Pith Inside Out

2015 ◽  
Vol 65 (5-6) ◽  
pp. 285-291
Author(s):  
Rafael Serrano Montero ◽  
Róger Moya
Keyword(s):  
Small Diameter ◽  
Tectona Grandis ◽  
Tropical Species ◽  
Gmelina Arborea ◽  
Inside Out

scholarly journals CRECIMIENTO INICIAL DE UNA PLANTACIÓN MIXTA DE ESPECIES TROPICALES EN VERACRUZ

2019 ◽  
Vol 1 (2) ◽  
pp. 65-80
Author(s):  
José Luis López Ayala ◽  
Vicente Sánchez Monsalvo ◽  
Edgar Hernández Máximo
Keyword(s):  
Tectona Grandis ◽  
Gmelina Arborea

El objetivo del presente estudio fue evaluar el crecimiento y desarrollo de una asociación de ocho especies forestales tropicales en sus primeros cinco años, bajo cuatro tratamientos: procedencia local sin fertilización, procedencia foránea sin fertilización, procedencia local con fertilización y procedencia foránea con fertilización y un primer aprovechamiento de Gmelina arborea al cuarto año. Se aplicó un modelo mixto para mediciones repetidas; se analizaron las variables: altura, diámetro normal y diámetro de copa, y se observó que, en general, la procedencia local con y sin fertilización registró los mayores valores promedio. La alta densidad favoreció el desarrollo de Tabebuia donnell-smithii y perjudicó el de las demás especies. El aclareo de Gmelina arborea permitió que se extendiera notablemente la copa de Tectona grandis y el diámetro normal de Tabebuia donnell-smithii, no así la altura en los otros taxa. Por último, las más sobresalientes fueron Gmelina arborea (altura = 6.75 m; diámetro normal = 0.08 m; diámetro de copa = 3.56 m) y Tabebuia donnell-smithii (altura = 4.26 – 4.65 m; diámetro normal = 0.04 – 0.05 m; diámetro de copa = 2.15 – 2.34 m); las mayores tasas de crecimiento se verificaron en altura y diámetro normal promedio en Gmelina arborea (4.23 m año-1 y de 0.044 m año-1) y Tabebuia donnell-smithii (1.47 m año-1 y de 0.017 m año-1).

Diversité de la régénération des ligneux dans les plantations forestières au centre de la Côte d’Ivoire

2021 ◽  
pp. 253-266
Author(s):  
Youssouf Koné ◽  
Bi Tra Aimé Vroh
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Tectona Grandis ◽  
Cedrela Odorata ◽  
Gmelina Arborea ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Régénération Naturelle ◽  
Tectona Grandis L.F

Description du sujet. La Côte d’Ivoire a une longue histoire d'utilisation d’espèces exotiques dans les activités de reboisement. Sa stratégie de reboisement a été basée à plus de 70 % sur Tectona grandis L.f., Cedrela odorata L. et Gmelina arborea Roxb. Très peu d’études ont permis de juger ces activités de reboisement sur la base de leur capacité à maintenir une diversité floristique ligneuse issue de la végétation initiale. Objectifs. La présente étude a pour objectif d’analyser l’incidence des plantations forestières à base d’espèces exotiques sur la régénération naturelle des arbres et arbustes dans une des forêts de reboisement. Méthode. La méthodologie d’échantillonnage stratifiée a permis de réaliser des inventaires dans quatre types d’habitat : les monocultures de tecks jeunes et âgées, les plantations plurispécifiques et les reliques forestières. Les individus adultes, les jeunes arbres et jeunes plants ont été dénombrés et leurs diamètres à hauteur de poitrine ont été mesurés. Résultats. Les reliques de forêt sont plus riches et plus diversifiées que les espaces de reboisements aussi bien chez les individus adultes que les jeunes arbres. Pour les jeunes plants, la diversité est similaire entre les différents habitats. Dans les différents habitats, les espèces les plus abondantes et les plus importantes sont exotiques. L’une d’entre elles, Cedrela odorata, a une abondance relativement remarquable dans les reliques forestières. Conclusions. Les tendances constatées dans la recolonisation des surfaces reboisées suggèrent que les nouvelles plantations devraient utiliser, sur les mêmes parcelles, plusieurs espèces exotiques et/ou indigènes pour améliorer la diversité végétale.

scholarly journals Durability of Thermally Modified Wood of Gmelina arborea and Tectona grandis Tested under Field and Accelerated Conditions

2017 ◽  
Vol 5 (3) ◽  
pp. 208-219 ◽  
Author(s):  
Róger Moya ◽  
Lucia Fallas-Valverde ◽  
Alexander Berrocal ◽  
Dawa Méndez-álvarez
Keyword(s):  
Tectona Grandis ◽  
Gmelina Arborea ◽  
Thermally Modified Wood ◽  
Modified Wood

scholarly journals Estimation of Above Ground Biomass and carbon stocks of Tectona grandis and Gmelina arborea stands in Gorontalo Province, Indonesia

2021 ◽  
Vol 22 (3) ◽  
Author(s):  
YOSEP RUSLIM ◽  
Daud Sandalayuk ◽  
Rochadi Kristiningrum ◽  
Andi Sahri Alam
Keyword(s):  
Tectona Grandis ◽  
Maximum Growth ◽  
Carbon Stocks ◽  
Maximum Point ◽  
Above Ground Biomass ◽  
Gmelina Arborea ◽  
Plantation Forest ◽  
Annual Increment ◽  
Ground Biomass ◽  
The Relationship

Abstract. Ruslim Y, Sandalayuk D, Kristiningrum R, Alam AS. 2021. Estimation of Above Ground Biomass and carbon stocks of Tectona grandis and Gmelina arborea stand in Gorontalo Province, Indonesia. Biodiversitas 22: 1497-1508. Plantation forest plays an important role to fulfill timber needs, while more recently plantation forest is increasingly acknowledged to sequester and store carbon which can mitigate climate change and also as carbon sequestration for the environment. This study aimed to calculate the stand potential, stand biomass and carbon stocks of teak (Tectona grandis) and gmelina (Gmelina arborea) stands in the context of land after being abandoned in Gorontalo Province, Indonesia. Four plots with size of one hectare each were sampled in which each species (i.e. teak and gmelina) consisted of two plots. In each plot, the diameter at the breast-high (1.3 m) and the height of each individual were recorded. Data analysis included growth parameters of the stands (i.e., Mean Annual Increment/MAI and Current Annual Increment/CAI) and above-ground biomass and carbon sequestered by the stands. Simple linear regression using polynomial trendline was used to determine the relationship between variables and the degree of the relationship. The results showed that the maximum growth of teak stands at Plots I and II reached a maximum point at the age of 32 and 25 years with the total volume of 307.50 and 254.81 m3ha-1, respectively. While the maximum growth of gmelina stands at Plots I and II reached a maximum point at the age of 15 years with the total volume of 190.54 and 251.80 m3ha-1, respectively. The biomass content in teak stands at Plots I and II and gmelina stands at Plots I and II were respectively 267.83; 221.94; 104.03 and 137.48 tons ha-1. Meanwhile, the carbon content in teak stands at Plots I and II and gmelina stands at Plots I and II were respectively 125.88; 104.31; 48.90; and 64.62 tons ha-1. The results of the regression analysis suggest that there was strong relationship between carbon sequestered and the age of the stands as well as total basal area. The results of this study suggest that Tectona grandis is more potential to be developed as plantation forest than Gmelina arborea when aiming at carbon sequestration and biomass production.

scholarly journals Diversity of Tree Species Used in Wood Carving and the Impact of Their Use on Forest Conservation in Benin.

2020 ◽  
Author(s):  
Hubert O. Dossou-Yovo ◽  
Valentin Kindomihou ◽  
Brice Sinsin
Keyword(s):  
Forest Conservation ◽  
Species Conservation ◽  
Tectona Grandis ◽  
Timber Species ◽  
Gmelina Arborea ◽  
Personal Use ◽  
Wood Carving ◽  
Industrial Markets ◽  
The Impact ◽  
Southern Benin

Abstract This research aimed at assessing the diversity of timber species used in wood carving in southern Benin, impact of this activity on forest conservation, and carvers’ willingness to contribute to species conservation. A preliminary survey was conducted to determine the number of wood carvers in three districts of Southern Benin. Then, a semi-structured questionnaire served to collect data from twelve wood carvers. Twenty-two species were used in wood carving with most species having red or yellow wood. The purchase of wood in industrial markets was the predominant source followed by the direct purchase from plantation and tree owners. Diospyros mespiliformis, Chlorophora excelsa,Tectona grandis and Gmelina arborea were species of which woods were most However, Gmelina arborea and Chlorophora excelsa exhibited the highest Use Value meaning their relative importance in terms of diversity of uses. All carvers reported the scarcity of woods and the destruction of forests and plantations for logging were the main cause; 25% of them own plantations of G. arborea and A. auriculiformis. Carvers indicated their willingness to have plantations of T. grandis and G. arborea for personal use and trade. Promoting reforestation and timber species plantation through sustainable tools is needed, and sensitizing them about forest conservation.

scholarly journals Qualitative and quantitative evaluation of the phytochemical constituents of three wood species in Ogun state, Nigeria

2020 ◽  
Vol 7 (3) ◽  
pp. 627-633
Author(s):  
K. M. Ogunjobi ◽  
◽  
S. O. Abdulwahab ◽  
O. F. Gakenou ◽  
O. E. Thompson ◽  
...  
Keyword(s):  
Secondary Metabolites ◽  
Plant Protection ◽  
Research Work ◽  
Tectona Grandis ◽  
Gmelina Arborea ◽  
Stem Wood ◽  
Qualitative And Quantitative ◽  
Ogun State ◽  
Phytochemical Constituents ◽  
Anogeissus Leiocarpus

Studies on the phytochemicals of the stem wood of tropical trees are scarce, despite its importance to plant protection and preservation as most researches focused on their leaves and fruits. This research work aimed to qualitatively and quantitatively analyze the phytochemicals present in the stem wood of Gmelina arborea, Tectona grandis and Anogeissus leiocarpus. Freshly sawn timbers were collected from a local sawmill and then grounded into finely powdered wood samples. The powdered wood samples and its extracts were screened for the presence or absence of phytochemicals using standard methodologies. The qualitative screening revealed the presence of various secondary metabolites such as tannin, saponin, steroids, flavonoid, alkaoids and terpene in all the three species. The result also showed that Tectona grandis had the highest percentage of Alkaloid (7.5%), Tannin (4.95%), and Flavonoid (4.67%) while Anogeissus leiocarpus had the highest percentage of Saponin (3.06%) and Terpene (1.45%). This study established the fact that the three selected species studied have potentials in the industries for medicinal and anti-pathogenic usages.

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