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ArticleRestoration of diversity and regeneration of woody species through area exclosure: The case of Maun International Airport in northern Botswana
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Deforested and degraded areas can be cheaply and conveniently restored through establishment of exclosures. An area exclosure excludes animals and humans from accessing an area to promote natural regeneration of plants and rehabilitate ecological condition of the area. The study was aimed at: (i) determining the diversity (species richness, diversity and evenness); (ii) assessing the stand structure (densities); and (iii) assessing regeneration status of woody species inside and outside exclosed Maun International Airport, northern Botswana. Vegetation sampling was conducted from April to May 2018. A total of 48 and 37 quadrats of 20 x 20 m were laid down at 50 m intervals along transect lines inside and outside Maun International Airport, respectively. Identity, number of all live individuals and height of all woody species were recorded in all the quadrats. The diversity of all woody species was analysed by using Shannon Diversity Index (H’) and regeneration status of each woody species was assessed using frequency distribution of height class. The diversity, evenness and species richness were significantly higher inside than outside Maun International Airport. Colophospermum mopane was the most abundant species both inside (75% of all woody species) and outside (96% of all woody species) Maun International Airport. More species showed healthy regeneration status inside than outside Maun International Airport. The inside of Maun International Airport recorded more alien invasive woody species compared with the outside, owing to its original use as a residential area. The local communities might have introduced these species as ornamental trees. This study has demonstrated the important role exclosures play in enhancing woody species richness, diversity and evenness as well as facilitating regeneration of woody species. This study has highlighted that degraded woodlands and other similar ecosystems can be cheaply and conveniently restored through establishment of exclosures. Keywords: Density; evenness; population structure; regeneration ID: 3624015 -
ArticleAssessing tree succession, species diversity and carbon sequestration potentials in off-reserve secondary forests for REDD+ implementation in Ghana
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Ghana is losing its primary forest, mostly forest reserves at an alarming rate. Secondary forests play a vital role in tropical landscapes, but few studies exist to assess their regeneration pathways and carbon sequestration in Ghana. We sought to find out the regeneration potentials, species diversity and carbon stocks accumulation of off-reserve secondary forests in the Moist Semi-deciduous and Dry Semi-deciduous zones. Four age classes were studied; 0-5, 6-10, 11-15 and 15+ years. Four plots with three replications were used for each age class. Nested plots were chosen; 33 m x 33 m for trees (dbh≥ 5 cm) 10 m x 10 m for saplings (≥1m tall and dbh <5cm) and 2 m x 2 m for seedlings. Age had significant differences in tree (dbh≥ 5 cm) density and basal area between the sites but not on sapling and seedling densities. A total of 129 tree species with dbh ≥5cm belonging to 95 genera and 40 families were identified. Mean Shannon-Weiner diversity index of trees (dbh ≥ 5cm) was 3.6±0.2 and 3.3±0.3 for the Moist Semi-deciduous and Dry Semi-deciduous zones respectively. Both age and forest site had significant effect on aboveground carbon accumulation with age of forest having more significance than climatic conditions. Age of a secondary forest has more effect on the species composition than climate. The secondary forest depicts the characteristic of young growth where the tree densities of most trees are confined to dbh= 5- 10cm in both zones and the potential of rapid recovery of species and carbon accumulation represents an important source of timber and carbon sink. The strong presence of regeneration portrays the potential for carbon sequestration under Reducing Emissions from Deforestation and forest Degradation (REDD+) if secondary forests are managed well in Ghana. Collaborative management of secondary forests with farmers and good forest polices can help Ghana achieve benefits such as timber, woodfuel, and carbon to participate in REDD+. Keywords: [Deforestation and forest degradation, REDD+, secondary forest, Climate change, Landscape management]\ ID: 3617260 -
ArticleGeographical variations of woodfuel supply and trade within 30 km of two forest protected areas in northeastern Bangladesh: The question of sustainability
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.We studied woodfuel vendors in 112 markets within 30 km from the borders of Khadimnagar National Park (KNP subregion) and Lawachara National Park (LNP subregion), evaluating how two subregions differ in relation to market attribute (degree of urbanisation), environmental attributes (tree coverage and seasonality), vendor characteristics, and woodfuel sources utilised. A total of 206 vendors were interviewed, including wholesalers, mixed wholesalers, and sawmill operators. Survey results revealed that vendors in rural areas sold greater quantities of woodfuel within KNP subregion, and semi-urban vendors sold higher quantities within LNP subregion. A total of 126 sawmills in two subregions sold greater amounts of woodfuel than the 58 wholesale woodfuel vendors and 22 mixed wholesale vendors, with significant differences. In terms of seasonal variations in woodfuel sales, significantly lower amounts of woodfuel sold in monsoon months and higher amounts in winter months. Non-forest sources including homestead forests, roadside social forestry plantations, tea estates, and via sawmills supplied 72% of the total woodfuel sale. The study suggests that roadside social forestry plantations and homestead forestry are key for sustainable supply of woodfuel for meeting sustainable development goals in forest and energy sectors of Bangladesh. Keywords: woodfuel vendors; woodfuel sources; non-forest sources; forest protected area; Bangladesh ID: 3486783
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