RESUMO
The study deals with the “Assessment of Plant biodiversity of Innerline Reserve Forest, Hailakandi (Assam)” India. that was carried out in six sites. A total of 54 species of trees belonging to 32 families with 2,303 individuals, 17 species of shrubs belonging to 13 families with 2,195 individuals and 27 species of grasses and herbs belonging to 13 families with a total of 1,595 individuals were encountered. Quadrate size of 400 m2 for trees, 100 m2 for shrubs, 20 m2 grasses and herbs. Compared to all the six sites, Site-III shows the highest Basal area (243.67 m2). In terms of IVI, Tectona grandis was found to be the most dominant tree species, Clerodendrum infortunatum was found to be the most dominant shrub species and Oplismenus compositus was found to be the most dominant grasses and herb species. In aspects for all the sites it can be concluded that Site-III showed the highest value for Shannon-Weiner Diversity Index (H?) (3.2) for trees species, Site-V showed the highest value for Shannon- Weiner Diversity Index (H?) (2.27) for shrubs species and Site-III showed the highest value for Shannon- Weiner Diversity Index (H?) (2.32) for grass & herb species.
RESUMO
Aims: Pench Tiger Reserve (PTR) is known for its rich biodiversity comprising of tropical deciduous forests as their primary forest type. Tropical deciduous forests are enriched with economically important species. They serve as habitat areas for most of the wild animals for their food and shelter. So, a phytosociological investigation was carried out in PTR to know the information on plant cover dynamics related to human activity, climate change, and all other factors affecting plant development.Place and Duration of Study: Pench Tiger Reserve (PTR), June 2021 to December 2022.Methodology: The study was carried out by laying out 47 sample plots in the PTR by dividing Tiger Reserve into 7 ranges. The plot size was 0.1 ha with 31.62 m x 31.62 m quadrats. Varied diversity indices such as Simpson, Shannon–Weiner, species evenness, and IVI were calculated according to standard formulae. Carbon stock, vegetation analysis and IVI value of each species were calculated and analysed.Results: A total of 102 species, comprising 90 genera and 44 families, were reported. The dominant family in the study area was Leguminosae, followed by Malvaceae and Poaceae. The Shannon–Weiner index was 2.92 and the Simpson index was 0.103, indicating moderate diversity with less dominance of trees, saplings, and herb layer in the area. Top five species holding highest IVI value are Tectona grandis (66.20), Lagerstroemia parviflora (20.44), Chloroxylon swietenia (19.91), Lannea coromandelica (18.35), and Terminalia tomentosa (16.62).Conclusions: As a part of long–term monitoring programme for the tree communities in the Pench Tiger Reserve, the current study has generated baseline data that will be used to evaluate the current ecological effects of ongoing and future climate change.
RESUMO
Current and future trends of the parklands and the population of Balanites aegyptiaca in western Niger were investigated through the analysis of the diversity, the regeneration status and the size class distributions of the woody plants. A total of 21 plots, measuring 2500 m2 (50 m x 50 m) each were randomly selected to represent the parklands of B. aegyptiaca in the study area. Across all plots 1180 individual plants were recorded, representing 13 species, 10 genera and 7 families. The most diverse family is Fabaceae and the most dominant family is Balanitaceae represented by only one species B. aegyptiaca. The density of the regeneration was 71.16 and 33.31 plants ha-1 for the entire parkland and the population of Balanites aegyptiaca, respectively, while the diversity and the evenness indices of B. aegyptiaca were 2.52 and 0.24, respectively. B. aegyptica, Faidherbia albida, Hyphaene thebeica and Acacia nilotica populations had the highest values for the importance value index (IVI). Results from the analysis of the size class distribution indicate that the parklands and the population of B. aegyptiaca appear to be healthy and stable with high regeneration rates. However, low recruitment of juveniles to adults was observed due to seedling and sapling mortality, and high disturbance regimes, which in the long term can affect the population turnover.Acacia tortilis, A. senegal, Azadirachta indica and Prosopis juliflora populations had the lowest IVI values and may be the most sensitive to the disturbance regimes in the study area. Therefore, we suggest designing and implementing a conservation programme in the study area, which will protect and facilitate the growth of the juveniles of both overexploited and underexploited populations.