scholarly journals Tree Species Composition and Diversity in Oban Forest Reserve, Nigeria

2014 ◽  
Vol 3 (1) ◽  
pp. 10 ◽  
Author(s):  
Humphrey Igbinosa Aigbe ◽  
Godwin Ejakhe Omokhua
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Tree Species ◽  
Basal Area ◽  
Growth Cycle ◽  
Forest Growth ◽  
Population Densities ◽  
Individual Tree ◽  
Forest Reserve ◽  
Tree Species Composition

Tree species composition and diversity were assessed in Oban Forest Reserve. Three stage sampling procedure was used to collect data on tree parameters – diameter at breast height (dbh); diameters over bark at the base, middle and top; merchantable height and total height using a minimum dbh limit of ≥10 cm in the tertiary sample plots. A total of 808 trees were measured and 72 species identified in the study area. Stand level parameters were estimated and tree diversity assessed. Results indicate that an average number of stems encountered per hectare were 306. Population densities of individual tree species ranged from 1 to 22 ha-1. Population densities of species were poor. The basal area/ha estimated is 34.67m2 and the species richness index obtained was 10.605, which indicate high species richness. The value of Shannon’s Index (HI) is 3.795 which is quite high.The results show that the forest reserve is a well-stocked tropical rainforest in Nigeria. The relative richness of the forest reserve in terms of individual tree species does not correlate well with the abundance because the abundance of each of the species was quite low and density poor. While there is paucity of most species, Staudtia stipitata was the most abundant (22 tree/ha). The forest has reverted back to the turbulent agrading stage of the forest growth cycle. 

scholarly journals Evaluation of Tree Species Composition for Sustainable Eco-Tourism Development of Maladumba Lake and Forest Reserve, Bauchi-Nigeria

2021 ◽  
Vol 2 (1) ◽  
pp. 16-19
Author(s):  
Ibrahim Umar ◽  
Lamido Auwalu ◽  
Ali Zakari ◽  
Ibrahim Fatima ◽  
Yahaya Umar Kubura ◽  
...  
Keyword(s):  
Species Composition ◽  
Tree Species ◽  
Protected Area ◽  
Tourism Development ◽  
Basal Area ◽  
Balanites Aegyptiaca ◽  
Forest Reserve ◽  
Tree Species Composition ◽  
Piliostigma Thonningii ◽  
Mitragyna Inermis

Ecotourism refers to travelling to relatively undisturbed or uncontaminated natural areas, such as protected areas, with the aim of studying, admiring, and enjoying the scenery and the faunal and floral composition along with its existing cultural aspects. This paper evaluated Tree species composition of Maladumba Lake and Forest Reserve, Bauchi-Nigeria for sustainable eco-tourism development. Wandering quarter method of vegetation analysis was employed for the study where five sampling sites were studied to determine species richness, percentage frequency, basal area, relative density, relative dominance, importance value indices, mean distance between trees, mean area of trees and number of individual stem per hectare of tree species encountered. Results obtained indicated total of eighteen different Tree species in the protected area with Mitragyna inermis (126732.9 cm), Adansonia digitata (31714.9 cm), Balanites aegyptiaca (29727.3 cm), and Piliostigma thonningii (28697.7 cm) as species with the highest basal area. While Funtumia elastica presented the highest frequency of occurrence (80%) followed by Acacia nilotica, Anogeissus leiocarpus, Balanites aegyptiaca and Cassia singueeana with 60% each. Relative densities of Mitragyna inermis (18.1%) stood as the highest, followed by Funtumia elastica (16.6%) and Balanites aegyptiaca (12.5%). Relative dominance suggested Mitragyna inermis (18.1%) with the highest value seconded by Adansoni digitata (12.4%) and Balanites aegyptiaca (11.7%). Mitragyna inermis (49.8) had the highest IVI followed by Balanites aegyptiaca (24.4) then Piliostigma thonningii (11.7). Very low values of mean distance between trees (6.9 m), mean area occupied by individual trees (47.6 m), and density of trees per hectare (210) suggested sparsely populated vegetation cover in the protected area. It was concluded that Maladumba Lake and Forest Reserve is under serious deforestation. As an Ecotourism attraction, serious reforestation program was recommended to salvage the situation before the whole protected lose its value.

scholarly journals The Riparian Tree Species Composition and Diversity of the Midstream of Halda River in Chittagong, Bangladesh

2019 ◽  
pp. 1-14
Author(s):  
Md. Humayain Kabir ◽  
Hillol Barua
Keyword(s):  
Species Composition ◽  
Tree Species ◽  
Diversity Index ◽  
Research Work ◽  
Basal Area ◽  
Eucalyptus Camaldulensis ◽  
Diversity Indices ◽  
Individual Tree ◽  
Tree Species Composition ◽  
Area And Volume

Riparian vegetation has been depleting in the many river basins of Bangladesh. Consequently, this study assessed the tree species composition, structure and diversity of the midstream area of the Halda River in Bangladesh. Twenty two quadrats (20 × 20m in size) were sampled. A total of 414 individual tree stems of ≥10 cm DBH of 36 tree species belonging to 31 genera and 15 families were enumerated. Density, Basal area and volume of the tree species were measured. Different diversity indices, i.e. Shannon-Wienners Diversity Index, Simpson's Dominance Index, Pielou’s Species Evenness Index, Margalef's and Menhinick’s richness index were calculated. Fabaceae was the most represented family with nine species, followed by Moraceae, Meliaceae and Anacardiaceae. Density, basal area and volume of the trees were 470.45 stem/ha, 19.09m²/ha and 139.42m³/ha, respectively. Samanea saman was found to be dominant, showing a maximum IVI, followed by v, Mangifer aindica, Eucalyptus camaldulensis and Artocarpus heterophyllus. The findings of the study will be helpful for the posterior researchers in their research work and their future tree based planning programs and conservation. So it is recommended that greater emphasis should be taken to proper management and conservation against over extraction and illegal felling for the maintenance of existing tree species composition and density.

scholarly journals The Impacts of Land Use and Forest Activities on Tree Species Composition and Structure on the Edges of Budongo Forest Reserve, Uganda

2010 ◽  
Vol 3 (1) ◽  
pp. 7-13 ◽  
Author(s):  
Jacob Godfrey Agea ◽  
Clement Akais Okia ◽  
Refaat Atalla Ahmed Abohassan ◽  
James Munga Kimondo ◽  
Susan B. Tumwebaze ◽  
...  
Keyword(s):  
Land Use ◽  
Species Composition ◽  
Tree Species ◽  
Forest Reserve ◽  
Tree Species Composition ◽  
Budongo Forest Reserve ◽  
Composition And Structure ◽  
Budongo Forest ◽  
Species Composition And Structure ◽  
Forest Activities

scholarly journals Object-oriented classification of Ikonos satellite data for the identification of tree species composition

2012 ◽  
Vol 52 (No. 4) ◽  
pp. 181-187 ◽  
Author(s):  
F. Hájek
Keyword(s):  
Species Composition ◽  
Tree Species ◽  
Object Oriented ◽  
Image Data ◽  
Rule Base ◽  
Automated Classification ◽  
Individual Tree ◽  
Tree Species Composition ◽  
Automated Technique

This paper describes the automated classification of tree species composition from Ikonos 4-meter imagery using an object-oriented approach. The image was acquired over a man-planted forest area with the proportion of various forest types (conifers, broadleaved, mixed) in the Krušné hory Mts., Czech Republic. In order to enlarge the class signature space, additional channels were calculated by low-pass filtering, IHS transformation and Haralick texture measures. Employing these layers, image segmentation and classification were conducted on several levels to create a hierarchical image object network. The higher level separated the image into smaller parts regarding the stand maturity and structure, the lower (detailed) level assigned individual tree clusters into classes for the main forest species. The classification accuracy was assessed by comparing the automated technique with the field inventory using Kappa coefficient. The study aimed to create a rule-base transferable to other datasets. Moreover, the appropriate scale of common image data and utilisation in forestry management are evaluated.

scholarly journals Tree Species Composition and Natural Regeneration Status of Southeast Region of Bangladesh

2020 ◽  
Vol 5 (1) ◽  
pp. 27
Author(s):  
Abir Dey ◽  
Aklima Akther
Keyword(s):  
Species Composition ◽  
Tree Species ◽  
Natural Regeneration ◽  
Native Species ◽  
Basal Area ◽  
Conservation Strategies ◽  
Stem Density ◽  
Importance Value Index ◽  
Tree Species Composition ◽  
Large Trees

The study aimed to quantify and discuss the current condition of the tree species composition and natural regeneration of southeast parts of Bangladesh (Cox’s Bazar North Forest Division). A total of 121 stems having dbh ≥10cm and 3481 stems of regenerating tree species (dbh <10cm) per hectare were recorded. A large trees comprised of 17 species belonging to 10 families and 14 genera and 30 regenerating tree species belonging to 19 families and 27 genera have been found. The forests were highly non-uniform, with three or four species represented most of the stands. The values of diversity indices indicated limited plant diversity, which is dominated by two or three tree species. Stems of 10-30 cm dbh contributed almost 90% of the total stem density, whereas more than 80% of the total basal area still belonged to trees with dbh 100 cm or above. Dipterocarpus turbinatus was the most dominant species which have the highest Importance Value Index (IVI) with 135.82 and embodied 37.71% of the total stand density and 72.19% of total basal area. The study will provide scientific basis for the future implementation of forest conservation strategies in tropical forests of Southeast Asia, particularly in Bangladesh. This study may also pave the way to further research on regeneration potentials of the native species for conservation and enhancement of forests in future.

scholarly journals A 17 Year Successional Enrichment Plantation of Tree Recruitment and Restoration in an African Tropical Forest

2021 ◽  
Author(s):  
Bernard Eromosele Omomoh ◽  
Gbenga Festus Akomolafe ◽  
Leah Spencer Brown ◽  
VAJ Adekunle
Keyword(s):  
Species Richness ◽  
Statistical Analysis ◽  
Tropical Forest ◽  
Tree Species ◽  
Forest Regeneration ◽  
Forest Trees ◽  
Growth Forms ◽  
Forest Reserve ◽  
Tree Species Composition ◽  
Enrichment Planting

Abstract Key message: The Enrichment Plantation of Akure Forest Reserve is one of the forests currently experiencing a 17-year-long post-disturbance following deforestation and fragmentation in Nigeria. Context: To better understand the contribution of enrichment planting on forest regeneration and restoration, when the Enrichment Plantation after 17 years of post-disturbance was examined. Aims: We studied the recruitment drive of aboveground and undergrowth stands of an Enrichment Plantation in the tropical forest reserve. We assess the trees diversity, species compositions, species richness, and growth forms of the vegetations. Methods: A total of 3(50m x50m) plots were sampled. A total of 47 aboveground tree species and 45 undergrowth stands from Enrichment Plantation were identified. A statistical analysis were used to quantified the data obtained from this resultsResults: The result shows an increase in the diversity and an even distribution of the species of the aboveground forest trees, compared to the undergrowth stands. Conversely, the aboveground forest trees have lower species richness as compared to the level of undergrowth stands. The sapling density was significantly higher than the aboveground tree of the. It was also observed that the aboveground forest trees and undergrowth stands are somewhat similar in species compositions, which implies that sapling recruitment is a key determinant of the tree species composition of the forest.Conclusion: It is then concluded that the method adopted for restoration encouraged species diversity in this successional forest among the aboveground trees species and undergrowth.

scholarly journals Tree Species Composition and Structure near Road Borders in the Laurel Forest of Anaga (Tenerife – Islas Canarias)

2016 ◽  
Vol 73 (2) ◽  
pp. 145
Author(s):  
Zaira Negrín ◽  
José Ramón Arévalo
Keyword(s):  
Species Composition ◽  
Tree Species ◽  
Sampling Site ◽  
Basal Area ◽  
Tree Species Composition ◽  
Laurel Forest ◽  
The Road ◽  
Road Systems ◽  
Surrounding Landscape ◽  
Study Sites

Urbanization is one of the main causes of species extinction. Closely linked to urbanization are road systems, which are a source of biotic and abiotic effects on the surrounding landscape. The continued existence of these corridors results in enormous human activity (Forman & Alexander, 1998). In particular, roads sharply define and fragment forest ecosystems leading to changes in plant species composition and vegetation structure from road border to the surrounding interior. This paper assesses border effects on tree species richness and composition in the laurel forest of Anaga, Tenerife, Spain. Effects of anthropogenic corridors on vegetation differed among the study sites. Multivariate analysis revealed that species composition is more related to the sampling site than to the effect of the corridor, while for density, significant differences were found between the road border and forest interior but not as a regular pattern. This suggests that main corridor disturbances regarding tree basal area is limited to the immediate road edge in the laurel forest, while for species composition, no significant differences were found.

scholarly journals Diversity and Structure of an Arid Woodland in Southwest Angola, with Comparison to the Wider Miombo Ecoregion

Diversity ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 140 ◽  
Author(s):  
John L. Godlee ◽  
Francisco Maiato Gonçalves ◽  
José João Tchamba ◽  
Antonio Valter Chisingui ◽  
Jonathan Ilunga Muledi ◽  
...  
Keyword(s):  
Species Diversity ◽  
Species Composition ◽  
Tree Species ◽  
National Park ◽  
Democratic Republic Of Congo ◽  
Basal Area ◽  
Vegetation Diversity ◽  
Tree Species Composition ◽  
Composition And Structure ◽  
Miombo Ecoregion

Seasonally dry woodlands are the dominant land cover across southern Africa. They are biodiverse, structurally complex, and important for ecosystem service provision. Species composition and structure vary across the region producing a diverse array of woodland types. The woodlands of the Huíla plateau in southwest Angola represent the extreme southwestern extent of the miombo ecoregion and are markedly drier than other woodlands within this ecoregion. They remain understudied, however, compared to woodlands further east in the miombo ecoregion. We aimed to elucidate further the tree diversity found within southwestern Angolan woodlands by conducting a plot-based study in Bicuar National Park, comparing tree species composition and woodland structure with similar plots in Tanzania, Mozambique, and the Democratic Republic of Congo. We found Bicuar National Park had comparatively low tree species diversity, but contained 27 tree species not found in other plots. Plots in Bicuar had low basal area, excepting plots dominated by Baikiaea plurijuga. In a comparison of plots in intact vegetation with areas previously disturbed by shifting-cultivation agriculture, we found species diversity was marginally higher in disturbed plots. Bicuar National Park remains an important woodland refuge in Angola, with an uncommon mosaic of woodland types within a small area. While we highlight wide variation in species composition and woodland structure across the miombo ecoregion, plot-based studies with more dense sampling across the ecoregion are clearly needed to more broadly understand regional variation in vegetation diversity, composition and structure.

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