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Journal articleAssessment of the population structure and phytosociology of Cola nitida (Vent.) Schott & 2 Endl and Garcinia kola Heckel: Implications for immediate conservation action in Nigeria
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Cola nitida and Garcinia kola are indigenous multipurpose tree species of West Africa that have the potentials of improving agroforestry practice in the sub-region. There is presently limited information available on the ecology of both species and are now characterized with low yield. This study was conducted to investigate the influences of vegetation type on the population structure and floral association of C. nitida and G. kola in Nigeria. The study was carried out in two vegetation type in Nigeria, data were collected by measuring the dendrometric variables. All plant species associated with the subject tree species in the study area were enumerated across their places of natural occurrence. Data were analyzed using descriptive and inferential statistics. A total number of 84 and 71 plant species were found associated with G. kola in both zones respectively. The height and stem diameter distribution of the two species showed a bell shape population structure, suggesting the presence of unstable demographic pattern. The diameter distribution skewed to the right, which indicated the predominance of adult individuals. The height-diameter relationships show expected height curve properties of monotomic increment. Both species coexist freely with other species, and can therefore be used in agroforestry practices. Keywords: Agroforestry, Cola nitida, Garcinia kola, multipurpose trees and PhytosociologyID: 3486498 -
Journal articleAllometric equation for estimating tree above ground biomass modified by ecological environmental factors in tropical dipterocarp forests
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Tropical Dipterocarp Forest (DF) plays an important role in mitigating climate change thanks to its carbon sequestration capacity. In order to estimate the CO2 absorption capacity of DF as a basis for the development of forest ecological services, a system of biomass equations is needed; while very few models for estimating biomass in DF have been published and have not yet reflected the impact of ecological environmental factors. The purpose of the study was to validate and select the best model for estimating tree above ground biomass (AGB, kg) in DF under the influence of ecological environmental factors, thereby improving the reliability. Twenty-eight 0.25 ha plots in the Central Highlands and one 1 ha plot in the Southeast ecoregion in Viet Nam were measured. A total of 329 trees were destructively sampled to obtain a dataset of AGB; Methods for developing equations were weighted nonlinear fixed/mixed models with/without random effects fit by Maximum Likelihood; Using K-fold cross validation with K = 10, we compared and selected the best model with and without ecological environmental factors. As a result, separate ecological environmental factors did not affect AGB, while the combination of the factors influences the AGB model through the form: AGB = AVERAGE × MODIFIER, AGB = a × Db ×WDd × exp (e2 × (P - 1502) + e3 × (BA - 12.62)) that was significantly more reliable than a model without these factors involved; where D (cm), WD (g / cm3), P (mm year-1) and BA (m2 ha-1) are the diameter at breast height, wood density, averaged annual rainfall and total basal area of forest stand, respectively. Keywords: above ground biomass, dipterocarp forest, ecological factor ID: 3473259 -
Journal articleTree diversity, stand structure and community composition of tropical forests in Dalma Wildlife Sanctuary of Jharkhand, India
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Species diversity and density of trees were assessed in forests of Dalma Wildlife Sanctuary of Jharkhand comprising mostly of tropical deciduous forests. We compared tree community characteristics like stem density, basal area, diversity index, Beta(β diversity), Girth class, Canopy height class and species composition of tree species in all three zones ( Altitude between 199 -603m) in the study area. A total of 41 tree species of 25 families, 71 genera, and 95 species were recorded. Gramineae (10) family is most represented followed by Euphorbiaceae(6). It was noticed that the tree density varied from 30.64 to 62.51. The maximum basal area contributed by Terminalia belerica(1.323 m2ha-1) followed by Albezzia stipulate(1.145 m2ha-1). Shannon Weiner index (H’) ranged from 3.073 to 3.997 and species richness index ranged from 1.05 to 1.20. Beta diversity of tree species varied from 2.32 to 3.80. The highest number of tree species was occurred in girth class of 61 – 80 cm in all three zones. At present the biodiversity of these forests are under threat due to the anthropogenic and illegal interference of outside people for cutting of furniture tree species. The present study will help us to understand the patterns of tree species composition and diversity in the Dalma Wildlife Sanctuary, of India. Keywords; Species diversity, Beta diversity, Basal area, Girth class, Canopy height and Species composition. ID: 3469677
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