scholarly journals Assessment of tree species diversity, composition and structure of Medha Kachhapia National Park, Cox’s Bazar, Bangladesh

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Mehraj Uddin ◽  
Faqrul Islam Chowdhury ◽  
Mohammed Kamal Hossain
Keyword(s):  
Species Diversity ◽  
Tree Species ◽  
National Park ◽  
Tree Diversity ◽  
Acacia Auriculiformis ◽  
Systematic Sampling ◽  
Suitable Habitat ◽  
Tree Species Diversity ◽  
Composition And Structure ◽  
Diversity Assessment

Abstract. Uddin M, Chowdhury FI, Hossain MK. 2020. Assessment of tree species diversity, composition and structure of Medha Kachhapia National Park, Cox’s Bazar, Bangladesh. Asian J For 4: 15-21. Tree species diversity assessment is considered an essential task to design robust conservation action plans of Protected Areas (PAs). Numerous researches have assessed tree diversity of different PAs of Bangladesh but tree diversity of Medha Kachhapia National Park (MKNP) is still unknown due to lack of research initiatives. It hinders forest managers of this PA to plan and implement conservation actions successfully. To this end, the study carried out a systematic sampling to ascertain composition, distribution, and diversity of tree species available at MKNP of Bangladesh. Findings revealed that representation of tree diversity of MKNP was very poor. Only 10 tree species representing 6 families were identified. Besides, MKNP was dominated by different Dipterocarpus spp. especially with Dipterocarpus costatus. Dominance in height and diameter classes and high Important Value Index (133.94) of D. costatus indicated that the tree might possess a suitable habitat in MKNP to maintain optimum dispersal, development, and growth. However, recent plantation activities with exotic Acacia auriculiformis and intensified human-induced disturbances might hamper its habitat. Thus, to conserve the habitat of D. costatus and remaining forest resources of MKNP, reforestation efforts should be shifted from exotic to native tree species, and community anthropogenic disturbances should be minimized.

scholarly journals Quantitative assessment of tree species diversity of Himchari National Park (HNP) in Cox’s Bazar, Bangladesh

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Saddam Hossen ◽  
Mohammed Kamal Hossain ◽  
Md. Akhter Hossain ◽  
Mohammad Fahim Uddin
Keyword(s):  
Species Diversity ◽  
Tree Species ◽  
National Park ◽  
Quantitative Assessment ◽  
Diversity Index ◽  
Tectona Grandis ◽  
The Other ◽  
Acacia Auriculiformis ◽  
Tree Species Diversity ◽  
Gmelina Arborea

Abstract. Hossen S, Hossain MK, Hossain MA, Uddin MF. 2020. Quantitative assessment of tree species diversity of Himchari National Park (HNP) in Cox’s Bazar, Bangladesh. Asian J For 5: 1-7. The aim of the study was to assess the tree species composition, dominance, and quantitative distribution of tree species of Himchari National Park, Cox’s Bazar in Bangladesh through stratified random sampling method using sample plots (51) of 20 m x 20 m in size during the period of January 2017 to May 2018. A total of 961 stems (dbh ≥ 5 cm) of 88 tree species belonging to 64 genera and 37 families were enumerated where the stem density and basal area were 457.39 stem ha-1 and 10.979 m2 ha-1 respectively. On the other hand, the species diversity index, Shannon-Wiener’s diversity index, Shannon’s maximum diversity index, species evenness index, Margalef’s diversity index, and Simpson’s diversity index were 0.092, 3.733 ± 0.0071, 4.477, 0.834, 12.667 and 0.039 ± 0.0003 respectively. The highest Importance Value Index (IVI) was found for Acacia auriculiformis (23.23) followed by Tectona grandis (13.05), Gmelina arborea (12.66), Syzygium fruticosum (12.34), Casuarina equisetifolia (10.57), and Dipterocarpus turbinatus (10.55). The IVI value represents that Acacia auriculiformis possess highest dominance that is followed by Tectona grandis and Gmelina arborea. Percentage distribution of tree individuals into different height classes found in quadrats showed that height range 3 - <8 m had the highest (59.83%) percentage of tree individuals. On the other hand, different dbh (having dbh ≥5 cm) classes showed that most of the trees (65.97%) belonged to dbh range 5 - <15 cm. The outcome of present study suggests for the protection, sustainable management, and conservation of the tree resources of HNP, Cox’s Bazar, Bangladesh.

scholarly journals Forest Structure and Tree Species Diversity along an Altitudinal Gradient in Doi Inthanon National Park, Northern Thailand

Tropics ◽  
2003 ◽  
Vol 12 (2) ◽  
pp. 85-102 ◽  
Author(s):  
Sakhan TEEJUNTUK ◽  
Pongsak SAHUNALU ◽  
Katsutoshi SAKURAI ◽  
Witchaphart SUNGPALEE
Keyword(s):  
Species Diversity ◽  
Forest Structure ◽  
Tree Species ◽  
National Park ◽  
Altitudinal Gradient ◽  
Tree Species Diversity ◽  
Northern Thailand ◽  
Doi Inthanon

scholarly journals Discerning Effects of Climate Variability, Local Land Degradation and Tree Species Diversity on Remote Sensing Derived Resilience and Resistance of Dry Afromontane Forest 

2020 ◽  
Author(s):  
Hadgu Hishe ◽  
Louis Oosterlynck ◽  
Kidane Giday ◽  
Wanda De Keersmaecker ◽  
Ben Somers ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Time Series ◽  
Species Diversity ◽  
Tree Species ◽  
Tree Diversity ◽  
Tree Species Diversity ◽  
Factors Associated ◽  
Afromontane Forest ◽  
Growth Stability ◽  
Dry Afromontane Forest

Abstract Introduction: Anthropogenic disturbances are increasingly affecting the vitality of tropical dry forests. The future condition of this important biome will depend on its capability to resist, and recover from these disturbances. So far, the temporal stability of dryland forests is rarely studied, but could serve as a basis for forest management and restoration. Methodology: In a degraded dry Afromontane forest in northern Ethiopia, we explored remote sensing derived indicators of forest stability, using MODIS satellite derived NDVI time series from 2001 to 2018. Resilience, resistance and variability were measured using the anomalies (remainders) after time series decomposition into seasonality, trend and remainder components. Growth stability was calculated using the integral of the undecomposed NDVI data. These NDVI derived stability indicators were then related to environmental factors of climate, topography, soil, tree species diversity, and disturbance, obtained from a systematic grid of field inventory plots, using boosted regression trees in R. Resilience and resistance were adequately predicted by these factors with an R2 of 0.67 and 0.48, respectively, but the models for variability and growth stability were weaker. Precipitation of the wettest month, distance from settlements and slope were the most important factors associated with resilience, explaining 51% of the effect. Altitude, temperature seasonality and humus accumulation were the significant factors associated with the resistance of the forest, explaining 61% of the overall effect. A positive effect of tree diversity on resilience was also significant, except that the impact of species evenness declined above a threshold value of 0.70, indicating that perfect evenness reduced the resilience of the forest. Conclusion: A combination of climate, topographic variables and disturbance indicators controlled the stability of the dry forest. Tree diversity is an important component that should be considered in the management and restoration programs of such degraded forests. If local disturbances are alleviated the recovery time of dryland forests could be shortened, which is vital to maintain the ecosystem services these forests provide to local communities and global climate change.

Tree Species Diversity in Community Managed and National Park Forests in the Mid-Hills of Central Nepal

2014 ◽  
Vol 33 (8) ◽  
pp. 796-813 ◽  
Author(s):  
Shiva Shankar Pandey ◽  
Tek Narayan Maraseni ◽  
Geoff Cockfield ◽  
Karin Gerhard
Keyword(s):  
Species Diversity ◽  
Tree Species ◽  
National Park ◽  
Tree Species Diversity ◽  
Central Nepal

scholarly journals Tree species diversity and structural composition: The case of Durgapur Hill Forest, Netrokona, Bangladesh

2019 ◽  
Vol 3 (1) ◽  
pp. 10-19 ◽  
Author(s):  
MD. RAYHANUR RAHMAN ◽  
Md. MIZANUR RAHMAN ◽  
Md. ARIF CHOWDHURY ◽  
JARIN AKHTER
Keyword(s):  
Species Diversity ◽  
Tree Species ◽  
Stand Structure ◽  
Diversity Index ◽  
Acacia Auriculiformis ◽  
Tree Species Diversity ◽  
Individual Tree ◽  
Height Range ◽  
Structural Composition ◽  
Shorea Robusta

Abstract. Rahman MdR, Rahman MdM, Chowdhury MdA, Akhter J. 2019. Tree species diversity and structural composition: The case of Durgapur Hill Forest, Netrokona, Bangladesh. Asian J For 3: 10-19. Tree species diversity and stand structure of Durgapur hill forest were assessed through stratified random sampling method using sample plots of 20 m x 20 m in size during the period of October 2017 to May 2018. A total of 1436 stems of ≥5 cm DBH of 56 tree species belonging to 50 genera and 29 families were enumerated from sample area. Density (855 stem ha-1) and Basal area (29.27 m2 ha-1) of tree species were enumerated. Besides, Shannon-Wiener’s, Margalef’s, Simpson’s and Pielou’s diversity index were recorded for all the tree species. The study showed that the most dominant 10 species have 58% of the total IVI (174.29 out of 300). Where, Acacia auriculiformis showed the maximum Importance Value Index (51.02) followed by Shorea robusta (24.23). Number of individual tree species were highest (49) in the height range of 7- <12 m whereas maximum (52) species were recorded in the DBH (cm) range of 5- <10 cm. However, Acacia auriculiformis, Shorea robusta, and Tectona grandis were found as the most dominant species based on hierarchical cluster analysis. Therefore, current study will be helpful to the future policymakers in formulating forest resource management plan of Durgapur hill forest.

Tree Regeneration Characteristics in Limestone Forests of the Cat Ba National Park, Vietnam

2021 ◽  
Author(s):  
Van Vien Pham ◽  
Christian Ammer ◽  
Peter Annighöfer ◽  
Steffi Heinrichs
Keyword(s):  
Species Richness ◽  
Species Diversity ◽  
Tree Species ◽  
National Park ◽  
Forest Regeneration ◽  
Tree Regeneration ◽  
Conservation Strategy ◽  
Tree Species Diversity ◽  
Site Factor ◽  
Overstory Tree

Abstract Background: Forest regeneration is decisive for future forest development and therefore of major concern to forest ecologists. The ability of overstory tree species to regenerate successfully is important for the preservation of tree species diversity and its associated flora and fauna. This study investigated forest regeneration dynamics in the Cat Ba National Park, a biodiversity hotpot in Vietnam. Data was collected from 90 sample plots and 450 sub-sample plots in the regional limestone forests. We compared species richness between the regeneration and overstory tree layers and examined the effect of environmental factors on the occurrence of regeneration. We developed five ratios to relate overstory and regeneration richness and diversity. Results: We found 97 tree species in the regeneration layer compared to 136 species in the overstory layer. Average regeneration density was 3,764 ± 1,601 per ha. Around 70% of the overstory tree species generated offspring. Of the tree species threatened according to The International Union for Conservation of Nature’s Red List of Threatened Species, only 36% were found in the regeneration layer. A principal component analysis provided evidence that the regeneration of tree species was linked to terrain factors (percentage of rock surface, slope) and soil properties (Cation exchange capacity, pH, humus content, soil moisture, soil depth). Contrary to our expectations, the prevailing light conditions (total site factor, gap fraction, openness, indirect site factor, direct site factor) had no influence on regeneration density and composition, probably due to the small gradient in light availability. Conclusion: We conclude that tree species richness in Cat Ba National Park appears to be declining at present. We suggest similar investigations in other biodiversity hotspots to learn whether the observed trend is a global phenomenon. In any case, a conservation strategy for the threatened tree species in the Cat Ba National Park needs to be developed if tree species diversity is to be maintained.

Toward Urban Forest Diversity: Resident Tolerance for Mixtures of Tree Species Within Streets

2019 ◽  
Vol 45 (2) ◽  
Author(s):  
Lyndal Plant ◽  
Dave Kendal
Keyword(s):  
Species Diversity ◽  
Tree Species ◽  
Urban Forest ◽  
Urban Climate ◽  
Tree Species Diversity ◽  
Local Resident ◽  
Forest Diversity ◽  
Composition And Structure ◽  
Street Tree ◽  
The City

Municipalities are setting targets for increasing street tree species diversity to support resilience and enhance the supply of ecosystem services from the urban forest. Assessments of street tree composition and structure, and consequent vulnerability to the stresses of urban climate change, pests, and disease, offer guidance for such targets. However, assessing local resident preferences toward species diversity within streets is also important to achieving such targets. Much of the research on street tree preference to date has focused on resident preferences for individual street tree characteristics, without reference to collective/contextual characteristics such as species diversity. We inferred resident preferences for collective street tree features, including species richness, from nearby house sale prices in the city of Brisbane, Australia. While home-buyers were willing to pay a premium for houses on streets with mature and aged trees, their tolerance for mixtures of species was limited to no more than six species nearby. Tolerance also varied within the city with greater sensitivity to mixtures of species in locations of greater socio-economic advantage. These findings suggest that increased diversity will not automatically be accepted by the community. Municipalities need to be cautious in their approach to increasing tree species diversity at finer scales, like streetscapes, within the urban forest.

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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