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Plant diversity and regeneration potential in forest protected areas of Sierra Leone

XV World Forestry Congress, 2-6 May 2022









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    Application of Assisted Natural Regeneration (ANR) to enhance forest biodiversity in West Kalimantan, Indonesia
    XV World Forestry Congress, 2-6 May 2022
    2022
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    West Kalimantan has a high diversity of biodiversity. In Betung Kerihun National Park, at least 1,216 flora species are identified, 75 species of them are endemic to Kalimantan. The area also has at least 48 mammal species, including orangutan and honey bear. Conserving this biodiversity is important to sustain the ecological function. The Assisted Natural Regeneration, introduced by the Forest Investment Program-1 with the objective to provide alternative methodology for conserving biodiversity, improve natural wilding growth, and support in sustainin genetic resources. Vegetation analyses were conducted in several transects representing different forest habitat in West Kalimantan. Both flora and fauna were recorded and analyze on their protection status, abundance, and diversity. A 2,000 Ha within the Danau Sentarum National park area was targeted for the ANR program. Flora/fauna plots were distributed at the peat forest in Pulau Majang Village. At the seedling stage, 5 species were identified. Dichilante borneensis dominated the seedling stage. At the tree stage, a species of Shorea balangaran dominates the strata with more than 1,000 individuals per Ha. Mother trees of Shorea balangaran and Gonystylus bancanus were also identified and marked for future seeds collection. During the forest patrol in the period of September 2020, seedlings were checked and any disturbance (grasses, climbers, tree falls) were removed. ANR focused on liberating seedlings and poles from these disturbances. Additionally, observation on fauna were conducted. Mammal species, reptile, and bird species were identified, in which all of them are protected (CITES I & II and according to the Indonesian regulation). Keywords: biodiversity, forest, regeneration, conservation, Kalimantan, Indonesia ID: 3488269
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    Restoration 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
    2022
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    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
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    Overstory-regeneration relationships in mixed-conifer forests of the southwestern United States
    XV World Forestry Congress, 2-6 May 2022
    2022
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    The ponderosa pine, dry- and wet-mixed conifers, and spruce-fir forests are major forest types in the southwestern United States. The ponderosa pine and dry mixed-conifer systems have historically relied on fire to maintain structure and composition. With the changes in fire regimes, there has been a long-term progression toward more shade-tolerant species such as Abies concolor. Using data from the USDA Forest Service Forest Inventory and Analysis program, this study focused on the relative proportions of each species in the seedling, sapling, and overstory tree cohorts. The hypothesis is that regeneration and subsequent development by species were proportional to the species in the overstory, accounting for shade tolerance. Transitions to a different future forest combination, if that transition was occurring, was related to the time since the previous disturbance, usually fire, and the relative proportion of Abies in the overstory mix. This paper examines a subset of the relationship between overstory basal area, latitude, elevation, and seedling numbers in the understory by species. We found three species – Picea engelmannii, Pseudotsuga menziesii, and Pinus ponderosa – displayed an interaction between overstory basal area and latitude upon seedling numbers in the understory. There was little separation at the more southerly locations, suggesting an external limiting factor, soil moisture availability, overcame species-specific silvical characteristics and competitive abilities. Future work will examine the presence of particular species in the overstory and their influence upon their own and other species' regeneration. Keywords: multiple species forests, regeneration trends, succession, microenvironment ID: 3486970

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