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In forestry, periodic annual increment (PAI) is the change in the size of a tree between the beginning and ending of a growth period, divided by the number of years that was designated as the growing period. [1] For sigmoid growth, the graph of PAI increases rapidly and then quickly declines, approaching zero. PAI may go negative if a tree ...
Graph of mean annual increment. Biologists use the concept of maximum sustainable yield (MSY) or mean annual increment (MAI), to determine the optimal harvest age of timber. MSY can be defined as “the largest yield that can be harvested which does not deplete the resource (timber) irreparably and which leaves the resource in good shape for ...
The mean annual increment (MAI) or mean annual growth refers to the average growth per year a tree or stand of trees has exhibited/experienced up to a specified age. For example, a 20-year-old tree that has a stem volume of 0.2 m 3 has an MAI of 0.01 m 3 /year.
Uganda Forestry Working Group (UFWG) is a Uganda-based organization and an informal network of forestry stakeholders, civil society organizations, academic and research institutions engaged in the development and sustainability of the forestry sector in Uganda that are multidisciplinary cutting across several sectors of national development. [1]
Today, forest and woodland cover in Uganda stands at 49,000 km 2 or 24% of the total land area. Of these 9,242.08 km 2 is tropical rainforest, 350.60 km 2 are forest plantations and 39,741.02 km 2 is woodland. 30% of these areas are protected as national parks, wildlife reserves or central forest reserves. [1]
The National Forestry Authority was established by the Act of Parliament in 2003 to replace the century-old Forest Department which as a purely government department had failed to address the challenges that the forestry sector was facing in the 1970s through to the 1990s.
The National Forestry Authority (NFA) in Uganda oversees the management of Nyabyeya Central Forest Reserve as a component of the Central Forest Reserve system. All 506 of Uganda's Central Forest Reserves , which together comprise around 12,657.47 square kilometers and make up 6.3% of the country's total land area, are managed by the NFA.
The cypress aphid ravaged cypress trees and hedgerows in Uganda in the 1990s, causing significant damage and crop loss. In the South Western region, the aphid attack severely impacted the softwood plantations including Bugamba forest reserve. [13] Illegal logging has also been an issue in the reserves, resulting in forest cover degradation. [14]