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1
Eba, Muluneh Sorecha. "Growth and survival rate of endemic trees of Ethiopia: Olea africana and Hagenia abysinicca in Lake Haramaya Watershed, Eastern Ethiopia." Journal of Horticulture and Forestry 9, no. 5 (May 31, 2017): 33–39. http://dx.doi.org/10.5897/jhf2017.0486.
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Belayneh, Alayu Haile, Kidane Giday Gebremedhin, and Yemane G. Egziabher. "Role of Acacia seyal on Selected Soil Properties and Sorghum Growth and Yield: A Case Study of Guba Lafto District, North Wollo, Ethiopia." International Journal of Agronomy 2021 (January 7, 2021): 1–8. http://dx.doi.org/10.1155/2021/6666674.
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Acacia seyal is one of the multipurpose parkland agroforestry tree species in eastern and southern Africa. It is a common on-farm tree in the Rift Valley of Ethiopia, but information is limited on its effect on soil properties and sorghum growth and yield. The study was conducted to evaluate its effect on selected soil properties and sorghum growth and yield in Guba Lafto district of northern Ethiopia. Six isolated and closely comparable Acacia seyal trees growing on sorghum farms were purposely selected, and plots were marked under the canopy of trees with three radial distances (0–2 m, 2–4 m, and 4–6 m) and one outside of the tree canopy (10 m away from any tree). Soil samples from each distance zone were taken between 0–20 cm and 20–40 cm soil depths for soil property analysis. Four quadrates with 1 m2 at each distance zone in four directions were laid for sorghum growth and yield attribute valuation. The results showed that only total nitrogen (TN) was significantly higher ( P < 0.05 ) at the subsoil layer under the canopy compared to an open area, while other selected soil parameters were not affected by the tree species. Sorghum biomass yield ( P = 0.006 ) and grain yield ( P = 0.025 ) were significantly lower under the canopy of the trees than in the open area. Generally, Acacia seyal had little effect in improving soil properties and showed a negative effect on sorghum yield and growth. Further research on its effect under wide area coverage of parkland system should be performed to bring a radical shift on the intercropping farming system.
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Belayneh, Alayu Haile, Kidane Giday Gebremedhin, and Yemane G. Egziabher. "Role of Acacia seyal on Selected Soil Properties and Sorghum Growth and Yield: A Case Study of Guba Lafto District, North Wollo, Ethiopia." International Journal of Agronomy 2021 (January 7, 2021): 1–8. http://dx.doi.org/10.1155/2021/6666674.
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Acacia seyal is one of the multipurpose parkland agroforestry tree species in eastern and southern Africa. It is a common on-farm tree in the Rift Valley of Ethiopia, but information is limited on its effect on soil properties and sorghum growth and yield. The study was conducted to evaluate its effect on selected soil properties and sorghum growth and yield in Guba Lafto district of northern Ethiopia. Six isolated and closely comparable Acacia seyal trees growing on sorghum farms were purposely selected, and plots were marked under the canopy of trees with three radial distances (0–2 m, 2–4 m, and 4–6 m) and one outside of the tree canopy (10 m away from any tree). Soil samples from each distance zone were taken between 0–20 cm and 20–40 cm soil depths for soil property analysis. Four quadrates with 1 m2 at each distance zone in four directions were laid for sorghum growth and yield attribute valuation. The results showed that only total nitrogen (TN) was significantly higher ( P < 0.05 ) at the subsoil layer under the canopy compared to an open area, while other selected soil parameters were not affected by the tree species. Sorghum biomass yield ( P = 0.006 ) and grain yield ( P = 0.025 ) were significantly lower under the canopy of the trees than in the open area. Generally, Acacia seyal had little effect in improving soil properties and showed a negative effect on sorghum yield and growth. Further research on its effect under wide area coverage of parkland system should be performed to bring a radical shift on the intercropping farming system.
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Muluneh Sorecha, Eba. "Growth and survival rate of endemic trees of Ethiopia: Olea africana and Hagenia abysinicca in the degraded lake of Haramaya Watershed, Ethiopia." Journal of Degraded and Mining Lands Management 04, no. 04 (June 1, 2017): 863–71. http://dx.doi.org/10.15243/jdmlm.2017.044.863.
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Kassa, Getachew, Takle Ferde, Amsalu Nigatu, and Fatih Yildiz. "Improving growth and productivity of Cordia africana trees using moringa leaf juice in north western Ethiopia." Cogent Food & Agriculture 6, no. 1 (January 1, 2020): 1762980. http://dx.doi.org/10.1080/23311932.2020.1762980.
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Abebe, Tesfaye. "Growth performance of some multipurpose trees and shrubs in the semi-arid areas of Southern Ethiopia." Agroforestry Systems 26, no. 3 (June 1994): 237–48. http://dx.doi.org/10.1007/bf00711213.
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Jacob, Miro, Maaike De Ridder, Marlies Vandenabeele, Tesfaalem Asfaha, Jan Nyssen, and Hans Beeckman. "The Response of Erica arborea L. Tree Growth to Climate Variability at the Afro-alpine Tropical Highlands of North Ethiopia." Forests 11, no. 3 (March 12, 2020): 310. http://dx.doi.org/10.3390/f11030310.
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The important ecosystem services of the high altitude tropical afro-alpine Erica arborea L. forests are under increasing environmental and human pressure. The Erica treeline ecotone in the Ethiopian highlands forms a temperature-responsive vegetation boundary that is potentially affected by climate change. The cambium of 10 Erica arborea trees in Lib Amba Mountain and Ferrah Amba Mountain in the North Ethiopian highlands was marked in 2012, and corresponding tree disks were sampled after 498 days. Microphotographs of these cambial marks confirmed the formation of annual growth rings (0.76 ± 0.24 mm) with higher vessel density in earlywood and radially flattened fibers in the last layers of the latewood. In-continuum measurements of vessel size and density on microphotographs indicated the formation of inter-annual density fluctuations (IADFs) related to early rainfall in March-May. The same stem disks and 40 increment cores were used for detailed tree-ring analyses—a tree-ring chronology with 18 trees spanning from 1966 to 2014 could be derived. A significant (p < 0.1) positive correlation with minimum temperature in the growing season (August) and a negative correlation with minimum temperature in the spring season (March) were indicated as the most important climate factors regulating tree growth of Erica trees in the afro-alpine forest. The existence of annual tree rings and the proven potential for chronology building encourages further tree-ring analyses of Erica arborea in the afro-alpine tropical highlands in order to link it with climate variability and climate change.
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Dilla, Aynalem M., Philip J. Smethurst, Neil I. Huth, and Karen M. Barry. "Plot-Scale Agroforestry Modeling Explores Tree Pruning and Fertilizer Interactions for Maize Production in a Faidherbia Parkland." Forests 11, no. 11 (November 4, 2020): 1175. http://dx.doi.org/10.3390/f11111175.
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Poor agricultural productivity has led to food shortages for smallholder farmers in Ethiopia. Agroforestry may improve food security by increasing soil fertility, crop production, and livelihoods. Agroforestry simulation models can be useful for predicting the effects of tree management on crop growth when designing modifications to these systems. The Agricultural Production Systems sIMulator (APSIM) agroforestry tree-proxy model was used to simulate the response of maize yield to N fertilizer applications and tree pruning practices in the parkland agroforestry system in the Central Rift Valley, Ethiopia. The model was parameterized and tested using data collected from an experiment conducted under trees and in crop-only plots during the 2015 and 2016 growing seasons. The treatments contained three levels of tree pruning (100% pruned, 50% pruned, and unpruned) as the main plots, and N fertilizers were applied to maize at two rates (9 or 78 kg N ha−1) as sub-plots. Maize yield predictions across two years in response to tree pruning and N applications under tree canopies were satisfactorily simulated (NSE = 0.72, RSR = 0.51, R2 = 0.8). Virtual experiments for different rates of N, pruning levels, sowing dates, and cultivars suggest that maize yield could be improved by applying fertilizers (particularly on crop-only plots) and by at least 50% pruning of trees. Optimal maize yield can be obtained at a higher rate of fertilization under trees than away from them due to better water relations, and there is scope for improving the sowing date and cultivar. Across a 34-year range of recent climate, small increases in yields due to optimum N-fertilizing and pruning were probably limited by nutrient limitations other than N, but the highest yields were consistently in the 2–4 m zone under trees. These virtual experiments helped to form hypotheses regarding fertilizers, pruning, and the effects of trees on soil that warrant further field evaluation.
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Roba, Alemayehu Diriba, Shimelis Dekeba, Wasihun Gizaw, and Mosisa Mezigebu. "EVALUATION OF COFFEE GROWTH, YIELD AND QUALITY UNDER COFFEE SHADE TREES AT MECHARA ON STATION, WEST HARARGHE ZONE, ETHIOPIA." International Journal of Research -GRANTHAALAYAH 9, no. 4 (April 30, 2021): 84–104. http://dx.doi.org/10.29121/granthaalayah.v9.i4.2021.3816.
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Abstract: Coffee production with shade trees is important to improve growth and quality of coffee, sustain and restore agroecology and nature based agroforestry practices. The trial was conducted at Mechara Agricultural Research Center (on station) in DaroLebu District of West Hararghe Zone, Oromia, Ethiopia. The study was intended to evaluate the influence of coffee shade trees on growth performance, yield and quality of coffee (Coffea arabica L.) under the canopy of Erytherina absinica, Cordia africana and Acacia sieberiana. The design was Randomized complete block design with three replications. The outcome had been observed a significant value at (p<0.05) probability level, non- significant value at (p>0.05) probability level and highly significance value at (p<0.01) probability level between treatments. Statistically significant and non- significant differences were observed between shaded and unshaded as well as within shaded effect based on the given parameters. Integration of shade in coffee farming system created creditable promising in producing organic coffee. Shade utility could be confirmed as to be ecologically sustainable, economically viable and socially acceptable practice. In so doing that, the effect of Erytherina absinica, Cordia africana shade trees illustrated the highest mean value in most parameters, while the least one is under the Acacia sieberiana shade tree. So the effect of Erytherina absinica mean observed with the highest value on total bearing plants 60%, thousand seed weight 59% and yield in Quintal per hectare 47.4% greater than the least treatments’ mean value based on growth parameters. On the other hand, the effect of Erytherina absinica mean observed with the higher value on aromatic intensity 46.4%, aromatic quality 87.2%, acidity 92.4%, body 93.5%, flavors 88.6% and overall quality 88.6% than the least treatments’ mean value, and also the effect of un-shade mean observed with the higher value on astringency 68.8% and bitterness 93.5% than the least treatments’ mean value based on organoleptic parameters. The highest mean value of Erytherina absinica observed on total bearing plants 12.1, thousand seed weight 130 gram and yield in Quintal per hectare 5.7 based on growth parameters, while based on organoleptic parameters, the highest mean value observed under the effect of Erytherina absinica shade tree on aromatic intensity 4.5, aromatic quality 3.9, acidity 7.9, body 7.7, flavors 7.9 and overall quality 7.9. Therefore, based on the most treatments’ parameters, to be the best shade tree was Erythrina abyssinica followed by cordia africana. Commonly, the dynamic indication of the treatment’s means difference were indicated between shaded and unshaded rather than within shaded means variation at most treatments’ parameters.
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Seyoum, Yigremachew, Masresha Fetene, Simone Strobl, and Erwin Beck. "Foliage dynamics, leaf traits, and growth of coexisting evergreen and deciduous trees in a tropical montane forest in Ethiopia." Trees 26, no. 5 (April 25, 2012): 1495–512. http://dx.doi.org/10.1007/s00468-012-0723-6.
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Atinafe, Ergua, Ephrem Assefa, Birhanu Belay, Yemenzwork Endale, and Talemos Seta. "Floristic Diversity and Natural Regeneration Status of Entoto Mountain and the Surrounding Area in Addis Ababa, Ethiopia." International Journal of Forestry Research 2020 (April 28, 2020): 1–10. http://dx.doi.org/10.1155/2020/4936193.
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The study was carried out at Entoto Mountain and its surrounding area, about 10 km north of the center of Addis Ababa. The purpose of this study was to assess the floristic composition and regeneration status of woody species and recommend further conservation methods. Ten transect lines were laid from south-north at 1 km interval. Along these transect lines, 62 sample plots of 400 m2 (20 m × 20 m) were laid at 1 km interval. A total of 179 plant species belonging to 107 genera and 60 families were recorded. Asteraceae (30 species) was the most dominant family. Of 179 plant species, 73 were naturally regenerated woody species representing 48 genera and 34 families. Herbs account for the largest growth form (91, 50.84%), indicating the fact that disturbance favors herb species. For the analysis of vegetation diversity, woody species composition, and density, the study area was classified into five land-use types. Of the five land-use types, degraded land-use type had low species diversity and evenness (1.48 and 0.295), and it had a low density of economically and ecologically important larger trees. However, the density of seedlings and saplings showed the normal regeneration status for the herbs and shrubs. Therefore, responsible stakeholders should give high priority for the conservation of ecologically and economically important large trees using appropriate conservation methods in the study area.
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Strobl, Simone, Masresha Fetene, and Erwin H. Beck. "Analysis of the “shelter tree-effect” of natural and exotic forest canopies on the growth of young Podocarpus falcatus trees in southern Ethiopia." Trees 25, no. 5 (March 29, 2011): 769–83. http://dx.doi.org/10.1007/s00468-011-0554-x.
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Tsegaye, Mintesnot, Belayneh Lemage, and Alemayehu Hido. "Seedling performance of different provenances of selected indigenous tree species in Debub Ari District, Southern Ethiopia." Global Journal of Earth and Environmental Science 6, no. 2 (April 30, 2021): 38–43. http://dx.doi.org/10.31248/gjees2020.086.
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Better understanding of variations in seed traits and seedling vigor in various populations of a given species is vital for appropriate nursery and tree planting technology. The main objective of this study was to identify better provenance for indigenous trees by testing seed germination and seedling traits. Seeds of six indigenous trees (Vachellia abyssinica, Vachellia seyal, Faidherbia albida, Balanites aegyptiaca and Terminalia laxiflora Engl.) were collected from different geographic areas. One hundred (100) polyethylene pots (20 cm height and 12 cm diameter) were filled with 2:1:1 ratio of local, forest soil and sand composition for seedlings. A Complete Randomized Design (CRD), 5 x 4 polyethylene pots in four replications of 20 polyethylene pots for each provenance was designed in the nursery and the provenances for selected species. Different early growth performance parameters were measured for each tested provenance. All collected data were analyzed by using ANOVA while the least significance difference was computed for mean separation. The seedling performance of Vachellia abyssinica and Vachellia seyal were significantly varied among the provenances. Vachellia abyssinica from Butajira provenance had the highest mean values across all the studied parameters. Except height, Kako provenance had the highest mean values across all the early performance parameters of Vachellia seyal. Seedling performances of Faidherbia albida in the nursery was significantly varied among the provenances except for root collar diameter. Provenance from Wondo Genet had the highest mean values of germination percent and comparable leaf numbers with provenance from Hawassa. It can be concluded that the observed patterns of variation will have the implication for genetic resources conservations and tree improvement. Accordingly, Butajira and Kako provenances could be taken as a good source of seed collection for Vachellia abyssinica and Vachellia seyal, respectively. Wondo Genet and Hawassa provenances could also ensure the provision of planting materials of Faidherbia albida for farmers. Further progeny tests in the field should be undertaken for a longer period to obtain definitive recommendations for early selection
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Abebe, Getu, Atsushi Tsunekawa, Nigussie Haregeweyn, Takeshi Taniguchi, Menale Wondie, Enyew Adgo, Tsugiyuki Masunaga, et al. "Effect of Soil Microbiome from Church Forest in the Northwest Ethiopian Highlands on the Growth of Olea europaea and Albizia gummifera Seedlings under Glasshouse Conditions." Sustainability 12, no. 12 (June 18, 2020): 4976. http://dx.doi.org/10.3390/su12124976.
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Loss of beneficial microbes and lack of native inoculum have hindered reforestation efforts in the severely-degraded lands worldwide. This is a particularly pressing problem for Ethiopia owing to centuries-old unsustainable agricultural practices. This study aimed to evaluate the inoculum potential of soils from church forest in the northwest highlands of Ethiopia and its effect on seedling growth of two selected native tree species (Olea europaea and Albizia gummifera) under a glasshouse environment. Seedlings germinated in a seed chamber were transplanted into pots containing sterilized and/or non-sterilized soils collected from under the canopy of three dominant church forest trees: Albizia gummifera (AG), Croton macrostachyus (CM), and Juniperus procera (JP) as well as from adjacent degraded land (DL). A total of 128 pots (2 plant species × 4 soil origins × 2 soil treatments × 8 replicates) were arranged in a factorial design. Overall, seedlings grown in AG, CM, and JP soils showed a higher plant performance and survival rate, as a result of higher soil microbial abundance and diversity, than those grown in DL soils. The results showed significantly higher plant height, root collar diameter, shoot, and total mass for seedlings grown in non-sterilized forest soils than those grown in sterilized soils. Furthermore, the bacterial relative abundance of Acidobacteria, Actinobacteria, and Nitrospirae was significantly higher in the non-sterilized forest soils AG, CM, and JP (r2 = 0.6–0.8, p < 0.001). Soil pH had a strong effect on abundance of the bacterial community in the church forest soils. More specifically, this study further demonstrated that the effect of soil microbiome was noticeable on the performance of Olea seedlings grown in the soil from CM. This suggests that the soils from remnant church forests, particularly from the canopy under CM, can serve as a good soil origin, which possibly would promote the native tree seedling growth and survival in degraded lands.
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Alem, Shiferaw, Petr Němec, and Hana Habrová. "Effects of a Trench as a Moisture Harvesting Structure on the Biomass Production and Growth of Trees Planted to Restore Degraded Land, Southern Ethiopia." Applied Sciences 10, no. 23 (November 30, 2020): 8560. http://dx.doi.org/10.3390/app10238560.
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Knowledge about the biomass productivity of trees planted in a rainwater harvesting structure, i.e., a trench (T), relative to a normal pit (P) on degraded land is scarce. The objective of this research paper is to compare the effect of T with P on the growth and biomass production of the Acacia saligna and Casuarina equisetifolia which were planted on degraded land. All the individual stems of both species in the T and P, their diameters at breast height (DBH) and heights in 2016 and 2020 were measured. Species-specific allometric equations were used to quantify the biomass production of the studied species. The t-tests were used for data analysis; both A. saligna and C. equisetifolia individuals planted in the T had higher DBH and height increment as compared with A. saligna and C. equisetifolia that were planted and grown in a P. The results also revealed significant differences on the mean DBH and height of A. saligna and C. equisetifolia planted in a T and P (p < 0.05). Between 2016 and 2020, the total biomass (TB) of A. saligna planted in a T and in a P increased significantly (p < 0.05) on average by 25.5 kg/tree and 7.7 kg/tree, respectively (p < 0.05). Similarly, the mean TB values of the C. equisetifolia planted in a T and a P between 2016 and 2020 increased significantly (p < 0.05) by 28.9 kg/tree and 13.1 kg/tree, respectively. Finally, establishing trenches to restore degraded lands was shown to facilitate growth and biomass production of planted species on degraded land.
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Ayele, Gebiaw T., Aschalew K. Tebeje, Solomon S. Demissie, Mulugeta A. Belete, Mengistu A. Jemberrie, Wondie M. Teshome, Dereje T. Mengistu, and Engidasew Z. Teshale. "Time Series Land Cover Mapping and Change Detection Analysis Using Geographic Information System and Remote Sensing, Northern Ethiopia." Air, Soil and Water Research 11 (January 1, 2018): 117862211775160. http://dx.doi.org/10.1177/1178622117751603.
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Land use planners require up-to-date and spatially accurate time series land resources information and changing pattern for future management. As a result, assessing the status of land cover change due to population growth and arable expansion, land degradation and poor resource management, partial implementation of policy strategies, and poorly planned infrastructural development is essential. Thus, the objective of the study was to quantify the spatiotemporal dynamics of land use land cover change between 1995 and 2014 using 5 multi-temporal cloud-free Landsat Thematic Mapper images. The maximum likelihood (ML)-supervised classification technique was applied to create signature classes for significant land cover categories using means and variances of the training data to estimate the probability that a pixel is a member of a class. The final Bayesian ML classification resulted in 12 major land cover units, and the spatiotemporal change was quantified using post-classification and statistical change detection techniques. For a period of 20 years, there was a continuously increasing demand for arable areas, which can be represented by an exponential growth model. Excepting the year 2009, the built-up area has shown a steady increase due to population growth and its need for infrastructure development. There was nearly a constant trend for water bodies with a change in slope significantly less than +0.01%. The 2014 land cover change statistics revealed that the area was mainly covered by cultivated, wood, bush, shrub, grass, and forest land mapping units accounting nearly 63%, 12%, 8%, 6%, 4%, and 2% of the total, respectively. Land cover change with agro-climatic zones, soil types, and slope classes was common in most part of the area and the conversion of grazing land into plantation trees and closure area development were major changes in the past 20 years.
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Roux, J., and M. P. A. Coetzee. "First Report of Pink Disease on Native Trees in South Africa and Phylogenetic Placement of Erythricium salmonicolor in the Homobasidiomycetes." Plant Disease 89, no. 11 (November 2005): 1158–63. http://dx.doi.org/10.1094/pd-89-1158.
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Erythricium salmonicolor causes a canker and die-back disease, commonly known as pink disease, on many tree species. During an investigation of diseases of Podocarpus henkellii and P. latifolius in the Mpumalanga Province of South Africa, typical symptoms of pink disease were observed on the branches of these trees. Stem and branch cankers covered with cracked bark and abundant pink mycelial growth were common on the affected trees. In subsequent surveys, the disease was also found on native Dais cotonifolia in the same area, as well as on native Ekebergia capensis and Maesa lanceolata in the KwaZulu-Natal Midlands. Phylogenetic analyses of ribosomal large subunit DNA sequence data were used to confirm the identity of the pathogen and obtain an indication of its phylogenetic placement within the Homobasidiomycetes. Isolates from all the native hosts recorded in this study, as well as from exotic Eucalyptus sp. and Acacia mearnsii, formed a strongly supported clade together with isolates from other parts of the world. Results confirmed that the pathogen in South Africa is Erythricium salmonicolor. Isolates from South Africa and Ethiopia grouped closely together, slightly different from E. salmonicolor isolates from the rest of the world. Our data also suggest that the genus name for E. salmonicolor possibly should be reconsidered because it groups separately from E. laetum or Corticium roseum. Phylogenetic analyses further indicated that the genus Erythricium is most closely related to Marchandiomyces aurantiacus, M. lignicola, C. roseum, E. laetum, Dendrothele maculata, D. roseacarneum, Vuilleminia comedens, V. macrospora, Punctularia strigoso-zonata and Galzinia incrustans. These genera form a separate subclade, the corticioid clade, within the Homobasidiomycetes. Pink disease is potentially important in South Africa because it affects a wide range of native and exotic tree species, and this study provides a foundation for further research.
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Bullock, Eric L., Sean P. Healey, Zhiqiang Yang, Phoebe Oduor, Noel Gorelick, Steve Omondi, Edward Ouko, and Warren B. Cohen. "Three Decades of Land Cover Change in East Africa." Land 10, no. 2 (February 3, 2021): 150. http://dx.doi.org/10.3390/land10020150.
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Population growth rates in Sub-Saharan East Africa are among the highest in the world, creating increasing pressure for land cover conversion. To date, however, there has been no comprehensive assessment of regional land cover change, and most long-term trends have not yet been quantified. Using a designed sample of satellite-based observations of historical land cover change, we estimate the areas and trends in nine land cover classes from 1998 to 2017 in Ethiopia, Kenya, Uganda, Malawi, Rwanda, Tanzania, and Zambia. Our analysis found an 18,154,000 (±1,580,000) ha, or 34.8%, increase in the area of cropland in East Africa. Conversion occurred primarily from Open Grasslands, Wooded Grasslands, and Open Forests, causing a large-scale reduction in woody vegetation classes. We observed far more conversion (by approximately 20 million hectares) of woody classes to less-woody classes than succession in the direction of increasing trees and shrubs. Spatial patterns within our sample highlight regional land cover conversion hotspots, such as the Central Zambezian Miombo Woodlands, as potential areas of concern related to the conservation of natural ecosystems. Our findings reflect a rapidly growing population that is moving into new areas, with a 43.5% increase in the area of Settlements over the three-decade period. Our results show the areas and ecoregions most impacted by three decades of human development, both spatially and statistically.
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Khurana, Ekta, and J. S. Singh. "Ecology of seed and seedling growth for conservation and restoration of tropical dry forest : a review." Environmental Conservation 28, no. 1 (March 2001): 39–52. http://dx.doi.org/10.1017/s0376892901000042.
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Dry forests are among the most threatened ecosystems and have been extensively converted into grasslands, secondary forest, savanna or agricultural land. Knowledge of seed germination and seedling establishment is required for the success of efforts on restoration of these forests. This review focuses on the ecological requirements at seed and seedling stages, and collates the current knowledge of seed viability, dormancy, germination pattern and seedling behaviour of dry tropical tree species. The spatio-temporal variations within the tropical dry forest biome in soil moisture, light, temperature, nutrients and intensity of predation, significantly affect the seed and seedling traits of component species. The majority of dry tropical species possess orthodox seeds which are characterized by dormancy, while a few have recalcitrant seeds which possess little or no dormancy. Seed coat dormancy, which can be overcome by mechanical or acid scarification or sometimes by transit through animal guts, is most prevalent in the dry tropical forest species. Persistent species dominating the undisturbed portions of the forest have bigger seeds compared to those that mostly occur in disturbed regions and require shade for the survival of their seedlings. Shade demand is associated with drought endurance, and may be absolute in species such as Guettarda parviflora and Coccoloba microstachya, or facultative as in Plumeria alba and Bursera simaruba. The fluctuation in temperature significantly affects seed germination in several species of dry Afromontane forest trees of Ethiopia. Seedling mortality is primarily a function of moisture stress during the dry period. Adaptive responses of seedlings to drought stress include increased chlorophyll content, for example in Acacia catechu, and root biomass, as in several dry forest species (for example Drypetes parvifolia, Teclia verdoornia) of Ghana. Mulching, application of fertilizers, interplanting of leguminous species and mycorrhizal inoculation are useful tools for promoting seedling establishment in nutrient-poor dry tropical soils. Periodic forest fires, and predation affect recruitment and seedling development according to their intensity. Many species experiencing frequent fires have evolved thick seed coats, produce fire-hardy seedlings, or escape the effect by temporal separation of seed dispersal and fire events. Predation may result in abortion of fruits or may enhance germination and recruitment by scarification and dispersal, as in most species of the Guanacaste dry forest. Exposure to elevated CO2 has increased relative growth rate, total leaf area and water use efficiency in most of the dry tropical seedlings tested, but the magnitude of the effect has varied markedly among species. Due to the availability of a large source of energy, large seeds show higher germination percentage, greater seedling survival and increased growth. Seeds originating from different provenances exhibit differences in germination and seedling growth (for example Prosopis cineraria, Albizia lebbeck, Eucalyptus camaldulensis and Acacia mangium), efficiency of nodulation (for example Acacia nilotica, A. auriculiformis), and stress resistance (for example Populus deltoides, Dalbergia sissoo). The review points out the need for coordinated, long-term, field-based studies for identification of multiple cues and niches for germination, on seed and seedling dynamics in response to fire, and on within-species genetic variability for selection of suitable provenances. Field-based studies at species and community levels are also needed to permit manipulations of biotic components to augment the recruitment of desired species and to suppress that of undesirable species.
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D. Awaritefe, O., and Danny Ochuko Ejemeyovwi. "Evaluating tourism potentials for site development tourism along River Ethiope, Abraka, Nigeria." Journal of Sustainable Tourism and Entrepreneurship 1, no. 2 (August 24, 2020): 151–64. http://dx.doi.org/10.35912/joste.v1i2.255.
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Purpose: The empirical research study evaluated environmental potentials of site locations for Tourism development along River Ethiope, Abraka Delta State, Nigeria, Four(4)sites’ 40 environmental features were considered important in the tourism sites evaluation. The primary data sources used include oral interview and administration of questionnaires. Research methodology: These are physical, biological and human components of tourism destinations, evaluated for each of the 4sites, and compared. Each of the 40 factors was measured using appropriate instruments like measuring tape and floater (for velocity). Students t test was undertaken to compare the evaluations of the two groups of professional and non-professional assessors. With a calculated value of 0.143, and table value of 0.283, with df2:3 at 0.05 level, the difference in site ranking between the first and second evaluation was not considered significant. High confidence or reliability can therefore be placed on the tourism site evaluation results obtained at the 0.05 significance level. The use of nominal or interval scales was to estimate variables, which were not subject to direct measurements in interval scale. Three groups of sites emerged from the preliminary survey of those selected: Natural or undeveloped sites, relate. Results: Result obtained showed that undeveloped and natural sites emerged most highly rated in environmental potentials for tourism site development compared to underdeveloped or highly developed sites. Limitation: The area lies within tropical equatorial rain forest vegetation which is an impenetrable ticket of under growth with trees and climbers. Moreover, dangerous reptiles especially (snakes and crocodile) as well as insect (Mosquitos and tsetse fly) are present and harmful to man in the environment. Contribution: The study concludes and suggests natural sites be accord priority in tourism site development along River Ethiope and invariably other related natural area worldwide for maximum patronage implications based on advocated research methodology. Keywords: Tourism, Site, Evaluation, Development, River Ethiope, Abraka
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Addi, Admassu, and Tura Bareke. "Review: Floral resources diversity of honeybees in important types of vegetation of Ethiopia." Asian Journal of Forestry 3, no. 2 (September 15, 2019). http://dx.doi.org/10.13057/asianjfor/r00300203.
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Abstract. Addi A, Bareke T. 2019. Review: Floral resources diversity of honeybees in important types of vegetation of Ethiopia. Asian J For 3: 64-68. The high biodiversity of Ethiopia is attributed to its wide ranges of altitude and great geo-morphological diversity. This has resulted in the existence of the region has diverse floral resources of which majority of them are honeybee flora. In this paper bee resources identification and reviewing bee forages were made to determine types of bee plants, floral diversity, flowering period and food source offered by the plants. Moreover, pollen analysis of honey from different regions of Ethiopia was analyzed for determination of major and minor honey source plants. Accordingly, over 1500 species of indigenous and exotic of plants belongs to 105 bee plant families were identified. The growth form analysis of bee forage comprising 41.6% herb, 28.7% shrubs, 21.7% trees, and 8% climbers. The majority of bee plant species flowered from September to November and April to May resulting in two major honey flow periods in the country. Melissopalynological analysis of the honey samples indicated that Schefflera abyssinica, Croton macrostachyus, Syzygium guineense, Vernonia amygdalina and Coffea arabica contributed for 80%, 64%, 86%, 77% and 75% of the total pollen count respectively from southwest and southeastern part of the country while Becium grandiflorum, Hypoestes forskaolii, Leucas abyssinica and Acacia spp. an accounting for 71%, 75.1%, 62%, and 70.5%, respectively from northern Ethiopia. On the other hand, Eucalyptus globulus and Guizotia scabra honey were from central Ethiopia, contributing to 94% of the pollen frequency. From this information, Ethiopia has rich bee forage diversity different vegetation types however, further collection and documentation of bee flora are required in unaddressed areas of the country. Thus in situ conservation, by ecological restoration, and raising and planting of seedlings of bee forages should be promoted for sustainable honey production.
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BELAY, HIRUT, and TIGIST WONDIMU. "Functional food plants in Debre Markos district, East Gojjam, Ethiopia." Asian Journal of Ethnobiology 2, no. 1 (May 1, 2019). http://dx.doi.org/10.13057/asianjethnobiol/y020102.
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Abstract. Belay H, Wondimu T. 2018. Functional food plants in Debre Markos district, East Gojjam Ethiopia. Asian J Ethnobiol 2: 8-21. An ethnobotanical analysis of functional food plants was conducted in Debre Markos District, East Gojjam, Ethiopia, to record indigenous knowledge. Ethnobotanical methods were used to collect data from October 2015 to July 2016. Ten villages were chosen at random from the District's 21 villages to perform the analysis. A total of 80 informants (61 men and 19 women) ranging in age from 20 to 79 were chosen to participate in the study and provide information on functional food plants grown and used in the District. Twenty of the 80 informants were chosen (as key informants) on the basis of recommendations from elders and kebele administrators, while the rest were chosen at random. Semi-structured interviews and group discussions were used to gather ethnobotanical data. As functional food plants grown in the District, 29 species from 27 genera and 19 families were identified. The Poaceae and Fabaceae families proved to be the most diverse, with 5 and 4 species, respectively. Herbs (23), shrubs (3), and trees are the species' habits (growth forms) (3). Grains (23.4%) and leaves (23.4%) were the most commonly used plant components (13.8%). Cooking/boiling seeds was the most common form of preparation (23.4%), followed by raw/unprocessed seeds (12.9%). According to informant consensus, Lupinus albus L. (Gibto) was the most commonly recorded species (90%) followed by Eragrostis tef L. (Dabbo teff) (78.8%). Linum usitatissimum L. (Telba) was found to be the most favored species for preventing multiple diseases in a preference rating. Based on the general use-value of functional food plants, a direct matrix analysis showed that Eragrostis tef L. (Dabbo teff) was the most important species. Cinnamomum verum L. was identified by the fidelity level index. Lupinus albus L. (Kerefa) (Gibto) to have a high practical benefit in the prevention of diabetes mellitus and hypertension. The key threat to a few functional food plants such as Lupinus albus (Gibto) in the study area was the loss of agricultural lands due to new building construction. The woreda is the central city of East Gojjam Zone. As a result, stalk owners must focus their efforts on resolving the problem
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Adem, Abdi. "Evaluation of Hararge coffee (Coffea arabica L.) landraces for moisture stress tolerance." Journal of Plant Stress Physiology, June 30, 2021, 28–31. http://dx.doi.org/10.25081/jpsp.2021.v7.6413.
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Arabica Coffee is an important export commodity for Ethiopia, contributing 25 to 30 % of the country’s total foreign exchange earnings. Moisture stress is one of the major constraints of coffee production in Hararge, Eastern Ethiopia. Moisture stress affects the growth, yield and quality of coffee. Local coffee landraces are source of desirable traits including moisture stress tolerance. Accordingly, this study was conducted to evaluate Hararge coffee landraces for moisture stress tolerance. Treatments consisted of 200 coffee landraces (178 from seven districts of east Hararge Zone and 22 from two districts of west Hararge Zone). The coffee landraces were field planted in July 2005 at Mechara Agricultural Research Center using augmented design with six trees per plot or accessions. Moisture stress tolerance was recorded from three randomly selected coffee trees per plot, three times a day (in the morning, noon and night) from January 05 to 25, 2014. The stress tolerance was determined using 1-5 scale by visual scoring (1- all leaves green and turgid, 2- most leaves still turgid but younger leaves show leaf folding; 3- all leaves wilt or fold, 4- Leaves partially turning pales, and partly shed showing severe wilting and 5-leaves completely turning brown and dry, mostly dropping). The collected data were analyzed using descriptive statistics. The result of this study revealed that the coffee landraces varied in their level of tolerance to moisture stress. The 200 coffee landraces were grouped into seven clusters based on their level of tolerance to moisture stress. Nine coffee landraces (4.5%) were highly tolerant to moisture stress, 25 (12.5%) were tolerant, and 36 (18%) were moderately tolerant. On the other hand, 60 coffee landraces (30%) were less tolerant; while 57 (28.5%), 11(5.5%) and 2 (1%) were moderately sensitive, sensitive and highly sensitive to moisture stress, in that order. There was variation in coffee landraces for moisture stress tolerance both between and within areas of the collection. Hence, it is advisable to maintain and use promising coffee landraces in coffee breeding. Screening of the landraces under controlled conditions like green house and studying of mechanisms of moisture stress is also the way forward.
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TESEMA, ASFAW DEMEKE, and GETACHEW BERHAN. "Assessment of biodiversity conservation in Entoto Natural Park, Ethiopia for ecotourism development." Asian Journal of Ethnobiology 2, no. 1 (May 1, 2019). http://dx.doi.org/10.13057/asianjethnobiol/y020103.
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Abstract. Belay H, Wondimu T. 2018. Functional food plants in Debre Markos district, East Gojjam Ethiopia. Asian J Ethnobiol 2: 8-21. An ethnobotanical analysis of functional food plants was conducted in Debre Markos District, East Gojjam, Ethiopia, to record indigenous knowledge. Ethnobotanical methods were used to collect data from October 2015 to July 2016. Ten villages were chosen at random from the District's 21 villages to perform the analysis. A total of 80 informants (61 men and 19 women) ranging in age from 20 to 79 were chosen to participate in the study and provide information on functional food plants grown and used in the District. Twenty of the 80 informants were chosen (as key informants) on the basis of recommendations from elders and kebele administrators, while the rest were chosen at random. Semi-structured interviews and group discussions were used to gather ethnobotanical data. As functional food plants grown in the District, 29 species from 27 genera and 19 families were identified. The Poaceae and Fabaceae families proved to be the most diverse, with 5 and 4 species, respectively. Herbs (23), shrubs (3), and trees are the species' habits (growth forms) (3). Grains (23.4%) and leaves (23.4%) were the most commonly used plant components (13.8%). Cooking/boiling seeds was the most common form of preparation (23.4%), followed by raw/unprocessed seeds (12.9%). According to informant consensus, Lupinus albus L. (Gibto) was the most commonly recorded species (90%) followed by Eragrostis tef L. (Dabbo teff) (78.8%). Linum usitatissimum L. (Telba) was found to be the most favored species for preventing multiple diseases in a preference rating. Based on the general use-value of functional food plants, a direct matrix analysis showed that Eragrostis tef L. (Dabbo teff) was the most important species. Cinnamomum verum L. was identified by the fidelity level index. Lupinus albus L. (Kerefa) (Gibto) to have a high practical benefit in the prevention of diabetes mellitus and hypertension. The key threat to a few functional food plants such as Lupinus albus (Gibto) in the study area was the loss of agricultural lands due to new building construction. The woreda is the central city of East Gojjam Zone. As a result, stalk owners must focus their efforts on resolving the problem.
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Gebregeorgis, Eyob Gebrehiwot, Justyna Boniecka, Marcin Pia̧tkowski, Iain Robertson, and Cyrille B. K. Rathgeber. "SabaTracheid 1.0: A Novel Program for Quantitative Analysis of Conifer Wood Anatomy — A Demonstration on African Juniper From the Blue Nile Basin." Frontiers in Plant Science 12 (March 18, 2021). http://dx.doi.org/10.3389/fpls.2021.595258.
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Knowledge about past climates, especially at a seasonal time scale, is important as it allows informed decisions to be made to mitigate future climate change. However, globally, and especially in semi-arid Tropics, instrumental climatic data are scarce. A dendroclimatic approach may fill this gap, but tropical dendrochronological data are rare and do not yet provide fine resolution intra-annual information about past climates. Unlike in the Tropics, in the Mediterranean, temperate, alpine, and arctic regions, dendroanatomy and quantitative wood anatomy (QWA) are progressing fast attaining an intra-annual resolution, which allows a better understanding of seasonal climate dynamics and climate–growth relationships. The existing dendroanatomical and QWA methods aren’t suitable for tropical trees because they do not consider the high variation in tree ring width and the frequent occurrence of micro-rings containing only a few tracheids per radial file. The available tracheid analysis programs generally fail to provide multiple sectors for micro-rings and they are unable to compute most of the useful dendroanatomical parameters at fine temporal resolutions. Here, we present a program (SabaTracheid) that addresses the three main standard tasks that are necessary for QWA and dendroanatomy before running a climate analysis: (1) tracheidogram standardization, (2) sectoring, and (3) computing QWA and dendroanatomical variables. SabaTracheid is demonstrated on African Juniper (Juniperus procera Hochst. ex Endl), but it is potentially able to provide fine-resolution QWA and dendroanatomic data that could be used for dendroanatomical studies in all regions of the world. SabaTracheid is a freeware that quickly and accurately standardizes tracheidograms, divides tree rings into multiple regular sectors, computes useful dendroanatomic and QWA variables for the whole tree rings, early- and latewood portions, and each sector separately. This program is particularly adapted to deal with high inter-annual growth variations observed in tropical trees so that it assures the provision of complete sectoral QWA and dendroanatomical data for micro-rings as well. We demonstrate SabaTracheid using a dataset of 30 Juniperus procera tree rings from the Blue Nile basin, in Ethiopia. SabaTracheid’s ability to provide fine resolution QWA and dendroanatomic data will help the discipline develop in tropical as well as in the Mediterranean and temperate regions.
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Hishe, Hadgu, Louis Oosterlynck, Kidane Giday, Wanda De Keersmaecker, Ben Somers, and Bart Muys. "A combination of climate, tree diversity and local human disturbance determine the stability of dry Afromontane forests." Forest Ecosystems 8, no. 1 (February 22, 2021). http://dx.doi.org/10.1186/s40663-021-00288-x.
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Abstract Background 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, even though identifying the important factors associated with the stability of the dryland forests 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 and resistance 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 local human disturbance, obtained from a systematic grid of field inventory plots, using boosted regression trees in R. Results Resilience and resistance were adequately predicted by these factors with an R2 of 0.67 and 0.48, respectively, but the model for growth stability was 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 important, 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. Precipitation of the wettest month was the most important factor explaining 43.52% of the growth stability variation. Conclusion A combination of climate, topographic factors and local human disturbance controlled the stability of the dry forest. Also tree diversity is an important stability 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.
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Kidane, Leul, and Alemu Kejela. "Food security and environment conservation through sustainable use of wild and semi-wild edible plants: a case study in Berek Natural Forest, Oromia special zone, Ethiopia." Agriculture & Food Security 10, no. 1 (May 17, 2021). http://dx.doi.org/10.1186/s40066-021-00308-7.
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Abstract Background Wild edible plants (WEPs) have an important role for rural communities in safeguarding food security, nutritive variation and continued earnings. Their significance, management and utilization are not fully documented. Objectives are to identify and document wild and semi-wild edible plants (WSWEPs) and their conservation status in Berek natural forest, Oromia special zone. Methods Various data collection tools were employed to gather data on WSWEPs. Ethnobotanical data were collected from 142 household representatives (77 men and 65 women) being at least 14 years old. Most of them (73.9%) had not received formal education. Data were analyzed using descriptive and inferential statistics, preference ranking, paired comparison, direct matrix ranking and informant consensus factor. Results A total of 34 useful WSWEP species belonging to 32 genera and 24 families were collected and identified. The family Rosaceae had the highest number of species (five species, 14.7%), followed by Anacardiaceae and Solanaceae with three species (8.8%) each. Growth form analysis showed that the majority of the species were trees (14 species; 41.2%), followed by herbs and shrubs (10 species each, 29.4%. These edible plants were available in different seasons; 15 (44%) of the plant species reached maturity in spring season while seven species (20.6%) were found in all seasons and eight (23.6%) species were able to reach maturity in autumn and winter. Although most of the local communities have an intimate relationship with their natural environment, there are common threats to WSWEPs and their habitat, particularly through overgrazing, fragmentation of the vegetation for agricultural expansion, introduction of exotic species, selective logging for construction purpose and charcoal making. Conclusion WSWEPs are valuable resources for improving the environment, food and nutritional security and income of households in rural areas. Moreover, to sustainably use edible plant species of the study area local communities and the Forest Administration should collaborate in managing these resources before becoming critically endangered.
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Berihun, Mulatu Liyew, Atsushi Tsunekawa, Nigussie Haregeweyn, Mitsuru Tsubo, and Ayele Almaw Fenta. "Changes in ecosystem service values strongly influenced by human activities in contrasting agro-ecological environments." Ecological Processes 10, no. 1 (July 22, 2021). http://dx.doi.org/10.1186/s13717-021-00325-1.
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Abstract Background Evaluating the impacts of land-use/land-cover (LULC) changes on ecosystem service values (ESVs) is essential for sustainable use and management of ecosystems. In this study, we evaluated the impact of human activity driven LULC changes on ESVs over the period 1982–2016/17 in contrasting agro-ecological environments: Guder (highland), Aba Gerima (midland), and Debatie (lowland) watersheds of the Upper Blue Nile basin, Ethiopia. Results During the study period, the continuous expansion of cultivated land at the expense of natural vegetation (bushland, forest, and grazing land) severely reduced the total ESV by about US$ 58 thousand (35%) in Aba Gerima and US$ 31 thousand (29%) in Debatie watersheds. In contrast, the unprecedented expansion of plantations, mainly through the planting of Acacia decurrens, led, from 2006, to a ESV rebound by about US$ 71 thousand (54%) in Guder watershed, after it had decreased by about US$ 61 thousand (32%) between 1982 and 2006. The reduction in natural forest area was the major contributor to the loss of total ESV in the study watersheds, ranging from US$ 31 thousand (63%) in Debatie to US$ 96.9 thousand (70%) in Guder between 1982 and 2016/17. On an area-specific basis, LULC changes reduced the average ESV from US$ 560 ha−1 year−1 (1982) in Guder to US$ 306 ha−1 year−1 (2017) in Debatie watersheds. Specific ESVs such as provisioning (mainly as food production) and regulating services (mainly as erosion control and climate regulation) accounted for most of the total ESVs estimated for the study watersheds. Conclusions In most cases, the total and specific ESVs of the watersheds were negatively associated with the population growth, which in turn was positively associated with the expansion of cultivated land over the study period. In Guder, however, ESVs were positively associated with population growth, especially after 2012. This is mainly due to the expansion of Acacia decurrens plantations. Our results suggest, therefore, that future policy measures and directions should focus on improving vegetation cover through planting multipurpose trees such as Acacia decurrens to prevent future loss of ESV in the midland and lowland regions of the Upper Blue Nile basin and beyond. However, caution must be taken during plantation of invasive species as they may have undesirable consequences.