scholarly journals Tree Species Diversity and Distribution in the Natural Forest of Onigambari Forest Reserve, Oyo State, Nigeria

2021 ◽  
Vol 25 (5) ◽  
pp. 829-834
Author(s):  
S.O. Olaoti-Laaro ◽  
D.M. Taiwo ◽  
K.A. Adeniji ◽  
S.A. Odewo ◽  
Z.T. Animashaun ◽  
...  
Keyword(s):  
Tree Species ◽  
Anthropogenic Activities ◽  
Diversity Indices ◽  
Population Based ◽  
Shannon Index ◽  
Simpson Index ◽  
Importance Value ◽  
Forest Reserves ◽  
Species Population ◽  
Evenness Indices

Anthropogenic activities has caused depletion of majority of Nigeria forest reserves, reducing forest lands to agricultural lands and grasslands. These prompted this study to consider the diversity of species as well as their species composition in the forest in February 2021. Four sub-plots were established in a cluster with an area of 50m by 50m, with 20m distance between each plots and 10m as edge effect. Twenty five tree species belonging to fifteen families were found in the study site. Family Malvaceae was the most represented. Triplochiton scleroxylon recorded the highest relative importance value (11.23). The diversity indices across the study plots assessed were species richness, evenness, Shannon index and dominance. Dominance indices across the study plots were low, asides for Plot 4 where. Triplochiton scleroxylon was dominant. Simpson index was highest in Plot 1 and lowest at Plot 4. Shannon index was highest, though in moderation in Plot 1 and relatively low in the remaining plots. Evenness indices across the four plots were high. However, the summarized diversity indices for the study site reflected dominance was generally low, Simpson index was high, Shannon index was moderate and Evenness index was moderate. The dendrogram depicted the relationship among the tree species population based on similarities and dissimilarities. Triplochiton scleroxylon belonged to a cluster while every other species with close similarity were categorized under cluster 2.

scholarly journals Structure, composition and tree diversity in a temperate forest under management

2019 ◽  
pp. 29-35
Author(s):  
Antonio Mora-Santacruz ◽  
María Leonor Román-Miranda ◽  
Omar Nungaray-Villalobos ◽  
Gerardo Alberto González-Cueva
Keyword(s):  
Temperate Forest ◽  
Cloud Forest ◽  
Basal Area ◽  
Diversity Indices ◽  
Shannon Index ◽  
Importance Value Index ◽  
Importance Value ◽  
A Value ◽  
Normal Diameter ◽  
Area And Volume

In order to study both diversity indices and structure of forests, which are an essential tool for decision-making in forest management, which show natural successional processes and effects for its management. So the objetive of this study was to evaluate structure and diversity of arboral species in a temperate forest of southern Jalisco state. Five permanent forestry research sites 50 x 50 (2.500 m2) were established, and a census of all tree species was carried out, with normal diameter greater than 7.5 cm. Each individual was measured: height and normal diameter, placing an aluminum plate for identification. We obtained the importance value index (IVI), indices of diversity, richness, and dasometric parameters. There were 17 species, 9 genera and 9 botanical families; the Fagaceae was dominant. Pinus douglasiana presented the highest IVI (57.93%); The Shannon index had a value of 2.0; the index of Margalef was 2.4; the forest has a density of 688 trees ha-1, being the most abundant Styrax ramirezii; Pinus herrerae obtained the highest values in basal area and volume with 30.77 m2 ha-1 and 357,325 m3 ha-1 respectively. The values of diversity are influenced by elements of the cloud forest

scholarly journals Floristic composition, diversity and structure of Khaya senegalensis stands in Benue Department, Cameroon

2021 ◽  
Vol 8 (1) ◽  
pp. 60-68
Author(s):  
Awé Djongmo Victor ◽  
Noiha Noumi Valery Valery ◽  
Madou Chantal Chantal ◽  
Zapfack Louis
Keyword(s):  
Species Richness ◽  
Diversity Index ◽  
Basal Area ◽  
Shannon Index ◽  
Simpson Index ◽  
Importance Value Index ◽  
Importance Value ◽  
Acacia Senegal ◽  
Significant Difference ◽  
Khaya Senegalensis

The present work has been done to provide basic data for a better conservation and valorization ofKhaya senegalensis stands in Sudano-Sahelian zone of Cameroon. A 100 m x 50 m transectmethod was undertaken to measure floristic diversity through the use of species richness,Shannon index, Pielou equitability, Simpson index, importance value index and importance valuefamily. The vegetation structure is determined by density, basal area and biovolume. Theinventory included trees with a dbh ?10 cm on an area of 1 ha per plot. A total of 6743individuals distributed in 24 families, 33 genera and 54 species were inventoried in all Khayasenegalensis stands studied. Statistical analysis showed significant differences, Shannon index,Simpson index, Pielou equitability, density, basal area, biovolume, species richness, heights class,diameters class, circumferences class but does not certify a significant difference of importancevalue index among in the villages. The undergrowth of Khaya senegalensis stands is more diverseat Bamé with a Shannon diversity index (ISH=5.87 ± 0.12 bit). The greatest of Pielou equitabilityis observed at Bamé (EQ=0.80 ± 0.01). The largest of Simpson index is recorded at Bamé(D=0.098 ± 0.001). Khaya senegalensis Stands are denser at Bamé (194 ± 3.12 individuals/ha).The basal area and biovolume of Khaya senegalensis stands are very high at Bamé (BA=25.87 ±0.06 m2/ha and Biovolume =15.32 ± 0.012 m3/ha). The species importance value is maximal in allthe studied villages (SIV=300 ± 71.45). The importance value index of species revealed a cleardominance in the undergrowth of Khaya senegalensis stands are Combretum adenogonium;Acacia senegal; Terminalia laxiflora; Guiera senegalensis; Acacia nilotica; Entada Africana.The vertical structure has three aspects, like the L (Dbh), asymmetric (height) and dissymmetrical(circumference) structures attesting to a strong regeneration of the understory ligneous woods ofKhaya senegalensis stands studied.

scholarly journals Tree Diversity, Conservation Status and Utilization Potentials of Shasha Rainforest Reserve, Southwestern, Nigeria

2021 ◽  
Vol 8 (2) ◽  
pp. 182-190
Author(s):  
O.D Akinyemi ◽  
A.J Oloketuyi ◽  
G.O Akinyemi ◽  
O.T Adeoye ◽  
O.A Aina-Oduntan ◽  
...  
Keyword(s):  
Tree Species ◽  
Conservation Status ◽  
Sampling Technique ◽  
Population Diversity ◽  
Cluster Sampling ◽  
Stable Group ◽  
Southwestern Nigeria ◽  
Forest Reserves ◽  
Species Population ◽  
Potential Use

An inventory of the entire tree species ≥10cm diameter at breast height (dbh) was carried out within Forestry Research Institute of Nigeria (FRIN) investigation 133 Shasha in Osun State, Nigeria. This study was carried out to ascertain the tree species diversity, conservation status and utilization potentials in the study area. The results were obtained from 16 sample plots of 50×50m in four tracts located through cluster sampling technique. In all, an average total of 295 stands distributed among 66 tree species and 28 families were encountered. High value of Shannon-Weinner index H'=3.73 and Evenness of E=0.89 were obtained for the reserve. At present, only few trees have attained the merchantable size of 48cm dbh. The 63 tree species in the study site were categorized into four groups namely, stable, vulnerable, endangered and threatened status. The result revealed that stable group had 1.59%, vulnerable 4.76%, endangered 44.44% and threatened 49.21%. Result of the Utilization potentials revealed that utility classes 7 - 8 accounted for 55.6% (comprises of tree species with no potential use for sawn timber), while 45.4%. of trees in classes 1 – 6 comprises of trees with timber potentials. This study highlighted species population diversity, conservation status and utilization potentials of the study site and called for ecological application in the management of forest reserves in Nigeria.

scholarly journals Ecological exploration of Kuwana forest: A tropical moist deciduous forest of eastern Terai, India

2017 ◽  
Vol 6 (12) ◽  
pp. 1811 ◽  
Author(s):  
Omesh Bajpai ◽  
Shraddha Suman ◽  
Nirmala Upadhyay
Keyword(s):  
Tree Species ◽  
Deciduous Forest ◽  
Uttar Pradesh ◽  
Principal Component ◽  
Diversity Indices ◽  
Tree Diversity ◽  
Forest Community ◽  
Importance Value Index ◽  
Importance Value ◽  
Lowland Forest

The present study was conducted in the Kuwana forest of Gonda forest division in Uttar Pradesh to explore its ecological inventories. Random stratified sampling was adopted to collect the basic information like frequency, density and abundance for the calculation of importance value index (IVI). On the basis of principal component analysis (PCA) plot, three forest communities were identified and named as, Syzygium Lowland Forest (SLF), Shorea Miscellaneous Forest (SMF) and Mallotus Miscellaneous Forest (MMF). MMF community allowed the maximum 39 while SLF minimum 18 tree species growing in it. Conversely, SMF community showed higher heterogeneous tree diversity validated by lower Dominance index (0.088) and higher Simpson index (0.912). The values of these two indices were found very low in comparison with their range for tropical forests of India. On the otherhand the diversity indices (Shannon & Fisher alpha) was calculated as maximum (2.797 & 11.960 respectively) for MMF community, which indicates the existence of better tree diversity in this forest community. The higher values of Evenness & Equitability indices (0.646 & 0.859 respectively) for SMF community showed the more evenly distribution of tree species in this community.

FLORISTIC COMPOSITION AND DIVERSITY OF TREE SPECIES IN KUMO TOWN AND ITS ENVIRONS

2021 ◽  
Vol 5 (2) ◽  
pp. 560-566
Author(s):  
Sadiq Abdullahi ◽  
H. M. Abba
Keyword(s):  
Tree Species ◽  
Sampling Method ◽  
Floristic Composition ◽  
Species Structure ◽  
Simpson Index ◽  
Adansonia Digitata ◽  
Importance Value Index ◽  
Importance Value ◽  
Systematic Random Sampling ◽  
The Family

Study was conducted on Floristic Composition and Diversity of Tree Species in Kumo Town and its Environs.  The aim was to investigate the Tree Species Structure, composition and diversity. Systematic random sampling method was used to sample the Tree species. The result showed that a total number of Twenty –Seven (27) species belonging to 8 genera and 12 families were identified. The family Leguminosae: Mimosoideae had the highest number of 4 species. The family Combretaceae, Moraceae, Caesalpinoidceae, and Palmae had 3 species each. The family Anacaediaceae, Myrtaceae, were represented by 2 species each. The remaining 5 families; Balanitaceae, Bombacaceae, Meliaceae, Rhamnaceae and Sterculiaceae were represented by 1 species each. The plant with the highest dominance was Adansonia digitata. The Shannon Weiner index was 2.45 and Simpson index was 0.48. This study therefore concluded that the species Azadirachta indica was the most abundant, with highest Relative Density, Relative Frequency, and Importance Value Index in the study area. This study recommended that the plants that had the lowest IVI such as Prosopis africana, Cassia sieberiana, need urgent conservation measures

scholarly journals Evaluating Multi-Sensors Spectral and Spatial Resolutions for Tree Species Diversity Prediction

2021 ◽  
Vol 13 (5) ◽  
pp. 1033
Author(s):  
Enoch Gyamfi-Ampadu ◽  
Michael Gebreslasie ◽  
Alma Mendoza-Ponce
Keyword(s):  
Species Richness ◽  
Species Diversity ◽  
Tree Species ◽  
Diversity Index ◽  
Diversity Indices ◽  
Shannon Index ◽  
Coefficient Of Determination ◽  
Landsat 8 ◽  
Tree Species Diversity ◽  
Sentinel 2

Forests contribute significantly to terrestrial biodiversity conservation. Monitoring of tree species diversity is vital due to climate change factors. Remote sensing imagery is a means of data collection for predicting diversity of tree species. Since various sensors have different spectral and spatial resolutions, it is worth comparing them to ascertain which could influence the accuracy of prediction of tree species diversity. Hence, this study evaluated the influence of the spectral and spatial resolutions of PlanetScope, RapidEye, Sentinel 2 and Landsat 8 images in diversity prediction based on the Shannon diversity index (H′), Simpson diversity Index (D1) and Species richness (S). The Random Forest regression was applied for the prediction using the spectral bands of the sensors as variables. The Sentinel 2 was the best image, producing the highest coefficient of determination (R2) under both the Shannon Index (R2 = 0.926) and the Species richness (R2 = 0.923). Both the Sentinel and RapidEye produced comparable higher accuracy for the Simpson Index (R2 = 0.917 and R2 = 0.915, respectively). The PlanetScope was the second-accurate for the Species richness (R2 = 0.90), whiles the Landsat 8 was the least accurate for the three diversity indices. The outcomes of this study suggest that both the spectral and spatial resolutions influence prediction accuracies of satellite imagery.

scholarly journals Composition of tree species in Onigambari Forest Reserve, Oyo State, Nigeria

2020 ◽  
Vol 24 (10) ◽  
pp. 1815-1819
Author(s):  
N.O. Haastrup ◽  
I Agboje ◽  
M.O. Lawal ◽  
B.O. Fadimu ◽  
O.A. Sangotoyinbo ◽  
...  
Keyword(s):  
Tree Species ◽  
Sustainable Management ◽  
Anthropogenic Activities ◽  
Forest Reserve ◽  
Forest Reserves ◽  
Breast Height ◽  
Plot Size ◽  
The Family ◽  
Management Techniques ◽  
Tree Composition

The tree composition of Onigambari Forest Reserve in Oyo State was evaluated by laying out a plot size of 50 x 50 m2 resulting to four plots per hectare. 104 and 93 stems per hectare were recorded. A total of 197 tree stands were encountered in the two compartments studied with family Sterculiaceae with species Cola gigantean, Cola millenii, Sterculia africana, Sterculia oblonga, Sterculia tragacantha, Triplochiton scleroxylon, Pterogota macrocarpa and Nesogordonia papaverifera.as the most abundant having 34 stands, followed by the family Papilionoideae with species Baphia nitida with 20 stands as the most abundance species. About thirty-nine percent of the tree species encountered were wildlings having a diameter at breast height of ≤ 10 cm. Less than one percent (0.50%) of the trees were of merchantable size. This could be a thing of concern and it calls for adequate resourceful and sustainable management techniques. Habits in Onigambari Forest Reserve are presented in Table 1. A total of forty-three (43) species of trees distributed into twenty (20) families were encountered. Family Sterculiaceae and Fabaceae was the richest with eight (8) species each followed by family Euphobiaceae with (5) tree species. Based on their habit, these species were classified into 100% trees. Furthermore, it is of the importance that the forest reserves be protected from illegal/indiscriminate logging among other anthropogenic activities in order to allow it regenerate. Keywords: Abundance, merchantable, sustainable, resourceful

scholarly journals Agrobiodiversity Indicators and Measurement using R for Description, Monitoring, Comparison, Relatedness, Conservation and Utilization

2021 ◽  
Vol 01 (01) ◽  
pp. 47-64
Author(s):  
Bal Krishna Joshi
Keyword(s):  
Qualitative Data ◽  
Temporal Analysis ◽  
Diversity Indices ◽  
Shannon Index ◽  
Simpson Index ◽  
Statistical Tools ◽  
Spatial And Temporal Analysis ◽  
The Status ◽  
The Many ◽  
Group Species

Agrobiodiversity is the most important part of biodiversity. It can be described, quantified, compared, and related by using different statistical tools called agrobiodiversity statistics (agro-statistics). Six components and 25 groups of agrobiodiversity should be used for agrobiodiversity analysis. Six types and levels of agrobiodiversity can be quantified. Both quantitative and qualitative data are used for estimating scores and indices. The measurement objects for describing agrobiodiversity are community, household, site, crop group, species, landrace, etc. These objects are called operational agricultural units (OAU). Agromorphological, molecular, and perception data are used in agrobiodiversity studies. Among the many software, RStudio is very good. It is an integrated part of R and includes a console, syntax-highlighting editor, tools for plotting, history, debugging, and workspace management. Vegan and BiodiversityR packages are commonly used for estimating diversity indices and multivariate analysis. Richness, Shannon index and Simpson index are very common means of quantifying agrobiodiversity. Spatial and temporal analysis of agrobiodiversity helps monitor the status and plan the programs and activities.

scholarly journals Composition, structure and diversity of tree species along an elevational gradient in Dudu forest range, Jammu and Kashmir, India

2018 ◽  
Vol 10 (3) ◽  
pp. 981-985 ◽  
Author(s):  
Anil Kumar Raina ◽  
Pinki Manhas
Keyword(s):  
Tree Species ◽  
Climatic Factors ◽  
Elevation Gradient ◽  
Elevational Gradient ◽  
Diversity Indices ◽  
Simpson Index ◽  
Forest Types ◽  
Jammu And Kashmir ◽  
Forest Division ◽  
Composition Structure

The present study has been undertaken along an altitudinal gradient (950-3500m a.s.l.) in Dudu Forest Range of Udhampur Forest Division, Jammu & Kashmir, India to understand the composition, structure and diversity of tree species along an elevation gradient in the area.  Ten forest types characterised by different dominant tree species with subtropical and temperate elements of vegetation have been recognised in the area.Overall average values of diversity indices such as Margalef’s Index (MI); Menhinik Index (MeI); Shannon-Weiner Index (H’) and Simpson Index (D) have been observed to be 1.70, 0.85, 1.66 and  0.61, respectively. The study suggested that distribution and species richness are largely regulated by physiographic and climatic factors along the gradient.

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