Forest coffee areas are hotspots areas for conservation of biodiversity due to anthropogenic effect on diversity and abundance of indigenous species. This study was aimed to determine the effect of forest coffee manag...Forest coffee areas are hotspots areas for conservation of biodiversity due to anthropogenic effect on diversity and abundance of indigenous species. This study was aimed to determine the effect of forest coffee management on woody species diversity and composition. The study was conducted in Dellomena and Harenna Buluk districts where natural forest and forest coffee are found adjacently. Systematic sampling method was used to collect woody species data from 16 transect lines. Eighty (80) sample quadrats of 20 m × 20 m quadrat size for mature trees/shrubs and five 5 m × 5 m subplots within each quadrat for saplings and seedlings were used. Forty-seven species of 29 families and 39 species of 24 families were recorded in natural forest and forest coffee areas respectively. Woody species frequently recorded in most of the sample plots were Celtis africana (100%), Podocarpus falcatus (95%), Strychnos mitis (95%), Diospyros mespili-formis (95%) and Diospyros abyssinica (90%) in the natural forest, and Celtis africana (95%) and Podocarpus falcatus (95%) in the forest coffee. Woody species richness (P = 0.000), Shannon diversity (P = 0.000), Simpson diversity indices (P = 0.02) and dominance (P = 0.02) were sig-nificantly varied between the two forests. This findings revealed significantly higher woody species diversity and richness in natural forest than forest coffee. Negative effects were noticed due to coffee management practices on woody species diversity and composition in forest coffee areas. Hence, reducing the human pressure on forest coffee via awareness raising and training on the effect of coffee management activities and introduction of environmentally friendly forest coffee management techniques are crucial to maintain ecological service and economic benefit of the forest coffee.展开更多
The study was conducted on Berbere Forest in Bale Zone of Oromia Regional State, south east of Ethiopia with the objective of determining the structural analysis and natural regeneration status of the forest. Systemat...The study was conducted on Berbere Forest in Bale Zone of Oromia Regional State, south east of Ethiopia with the objective of determining the structural analysis and natural regeneration status of the forest. Systematic sampling method was used to collect vegetation data. Seventy two nest quadrat sizes of 400 m2 (20 m × 20 m) for trees and shrubs were used. Within the main quadrat, two opposite side of each sub-quadrat of 25 m2 (5 m × 5 m) for sapling, 4 m2 (2 m × 2 m) for seedling of woody plants. The diameter and height were measured for all individual trees and shrubs having DBH (Diameter at Breast Height) ≥ 10 cm thick and ≥2 m height by using a diameter tape or caliper and clinometer respectively. For description and analysis of vegetation structure Diameter at Breast Height (DBH), basal area, tree density, height, frequency and important value index were used. Structural analysis of some selected tree species was revealed four different population patterns (bell shaped, inverted J-shaped, irregular and U-shaped). The total basal area of Berbere forest was 87.49 m2/ha, but most of the basal area was contributed by few large sized Moraceae family (Ficus vasta, Ficus ovate and Ficus thonningii) plant species. Analysis of regeneration status of woody plants in the forest showed 37.09% trees/shrubs species exhibited “good”, 19.35% showed “fair”, 6.45% showed “poor” and 25.81% trees/shrubs species were “not regenerating” at all and 11.29% trees/shrubs species were available only in sapling or seedling stage. Studies on the structure and regeneration of the forest indicated that there are species that require urgent conservation measures. Therefore, based on the results of this study, we recommended detail regenerating studies of seed bank in relation to various environmental factors such as soil type and properties.展开更多
文摘Forest coffee areas are hotspots areas for conservation of biodiversity due to anthropogenic effect on diversity and abundance of indigenous species. This study was aimed to determine the effect of forest coffee management on woody species diversity and composition. The study was conducted in Dellomena and Harenna Buluk districts where natural forest and forest coffee are found adjacently. Systematic sampling method was used to collect woody species data from 16 transect lines. Eighty (80) sample quadrats of 20 m × 20 m quadrat size for mature trees/shrubs and five 5 m × 5 m subplots within each quadrat for saplings and seedlings were used. Forty-seven species of 29 families and 39 species of 24 families were recorded in natural forest and forest coffee areas respectively. Woody species frequently recorded in most of the sample plots were Celtis africana (100%), Podocarpus falcatus (95%), Strychnos mitis (95%), Diospyros mespili-formis (95%) and Diospyros abyssinica (90%) in the natural forest, and Celtis africana (95%) and Podocarpus falcatus (95%) in the forest coffee. Woody species richness (P = 0.000), Shannon diversity (P = 0.000), Simpson diversity indices (P = 0.02) and dominance (P = 0.02) were sig-nificantly varied between the two forests. This findings revealed significantly higher woody species diversity and richness in natural forest than forest coffee. Negative effects were noticed due to coffee management practices on woody species diversity and composition in forest coffee areas. Hence, reducing the human pressure on forest coffee via awareness raising and training on the effect of coffee management activities and introduction of environmentally friendly forest coffee management techniques are crucial to maintain ecological service and economic benefit of the forest coffee.
文摘The study was conducted on Berbere Forest in Bale Zone of Oromia Regional State, south east of Ethiopia with the objective of determining the structural analysis and natural regeneration status of the forest. Systematic sampling method was used to collect vegetation data. Seventy two nest quadrat sizes of 400 m2 (20 m × 20 m) for trees and shrubs were used. Within the main quadrat, two opposite side of each sub-quadrat of 25 m2 (5 m × 5 m) for sapling, 4 m2 (2 m × 2 m) for seedling of woody plants. The diameter and height were measured for all individual trees and shrubs having DBH (Diameter at Breast Height) ≥ 10 cm thick and ≥2 m height by using a diameter tape or caliper and clinometer respectively. For description and analysis of vegetation structure Diameter at Breast Height (DBH), basal area, tree density, height, frequency and important value index were used. Structural analysis of some selected tree species was revealed four different population patterns (bell shaped, inverted J-shaped, irregular and U-shaped). The total basal area of Berbere forest was 87.49 m2/ha, but most of the basal area was contributed by few large sized Moraceae family (Ficus vasta, Ficus ovate and Ficus thonningii) plant species. Analysis of regeneration status of woody plants in the forest showed 37.09% trees/shrubs species exhibited “good”, 19.35% showed “fair”, 6.45% showed “poor” and 25.81% trees/shrubs species were “not regenerating” at all and 11.29% trees/shrubs species were available only in sapling or seedling stage. Studies on the structure and regeneration of the forest indicated that there are species that require urgent conservation measures. Therefore, based on the results of this study, we recommended detail regenerating studies of seed bank in relation to various environmental factors such as soil type and properties.
