Degraded Forests in Eastern Africa

Bongers, Frans; Tennigkeit, Timm

doi:10.4324/9781849776400

Cited by 30 publications

(7 citation statements)

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“…Dry Afromontane forests are distributed across the Tigray highlands of northern Ethiopia 6) . This area of the Tigray highlands has suffered land degradation due to deforestation 20) .…”

Section: Introductionmentioning

confidence: 99%

Effects of biochar on the growth of Olea europaea subsp. cuspidata and Dodonaea angustifolia planted in Tigray, northern Ethiopia

et al. 2019

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In northern Ethiopia, revegetation is necessary for preventing land degradation. However, planting seedlings show high mortality under arid climate. Biochar has the capacity to enhance seedling survival and symbiosis with arbuscular mycorrhizal fungi. We planted Olea europaea subsp. cuspidata and Dodonaea angustifolia into soil treated with biochar made from Acacia etbaica. We could not confirm the effects of biochar on the growth of these species; however, biochar was increased colonization of arbuscular mycorrhizal fungi. We concluded that application of biochar enhanced symbiosis with arbuscular mycorrhizal fungi under arid climate and was efficient for the revegetation in northern Ethiopia.

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“…Dry Afromontane forests are distributed across the Tigray highlands of northern Ethiopia 6) . This area of the Tigray highlands has suffered land degradation due to deforestation 20) .…”

Section: Introductionmentioning

confidence: 99%

Effects of biochar on the growth of Olea europaea subsp. cuspidata and Dodonaea angustifolia planted in Tigray, northern Ethiopia

et al. 2019

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“…The changes affect and contribute to local, regional, and global aspects of earth system functioning [1][2][3]6]. In African landscapes, pastoralism, shifting cultivation, permanent or semi-permanent agriculture, and agroforestry have altered the environment to a point that the present landscape is the product of human-induced changes as much as natural variation in vegetation [7]. Over the last decades, anthropogenic impacts and competition over land have become issues of major concern [8,9].…”

Section: Introductionmentioning

confidence: 99%

Agricultural Expansion and Intensification in the Foothills of Mount Kenya: A Landscape Perspective

et al. 2017

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This study spatially assesses, quantifies, and visualizes the agricultural expansion and land use intensification in the northwestern foothills of Mount Kenya over the last 30 years: processes triggered by population growth, and, more recently, by large-scale commercial investments. We made use of Google Earth Engine to access the USGS Landsat data archive and to generate cloud-free seasonal composites. These enabled us to accurately differentiate between rainfed and irrigated cropland, which was important for assessing agricultural intensification. We developed three land cover and land use classifications using the random forest classifier, and assessed land cover and land use change by creating cross-tabulation matrices for the intervals from 1987 to 2002, 2002 to 2016, and 1987 to 2016 and calculating the net change. We then applied a landscape mosaic approach to each classification to identify landscape types categorized by land use intensity. We discuss the impacts of landscape changes on natural habitats, biodiversity, and water. Kappa accuracies for the three classifications lay between 78.3% and 82.1%. Our study confirms that rainfed and irrigated cropland expanded at the expense of natural habitats, including protected areas. Agricultural expansion took place mainly in the 1980s and 1990s, whereas agricultural intensification largely happened after 2000. Since then, not only large-scale producers, but also many smallholders have begun to practice irrigated farming. The spatial pattern of agricultural expansion and intensification in the study area is defined by water availability. Agricultural intensification and the expansion of horticulture agribusinesses increase pressure on water. Furthermore, the observed changes have heightened pressure on pasture and idle land due to the decrease in natural and agropastoral landscapes. Conflicts between pastoralists, smallholder farmers, large-scale ranches, and wildlife might further increase, particularly during the dry seasons and in years of extreme drought.

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“…Ethiopian is endowed with various landscape types resulted in different agroecological zones and vegetation types of the country. The vegetation types varied from tropical rain forest and cloud forests in the southwest to the desert scrubs in the east and northeast and diversified agroforestry practices and systems in the central highlands (Bongers and Tennigkeit, 2010). The structure and species composition of the natural vegetation types are also diverse due to the presence of wider physiognomic and climatic landscapes in the country.…”

Section: Ethiopian Forestsmentioning

confidence: 99%

“…More than 7000 species of plants, 240 species of mammals and 845 species of birds are found in the country. Among this 1150 species of plants, 22 species of mammals and 24 species of birds are endemic (Bongers and Tennigkeit, 2010). The vegetation are important for production, protection and conservation functions in the country.…”

Section: Ethiopian Forestsmentioning

confidence: 99%

Forest management options and carbon stock and soil rehabilitation in Chilimo Dry Afro-Montane forest, Ethiopia

Tesfaye¹

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Five studies were conducted in Central Highlands of Ethiopia to generate alternative forest management options for carbon stock and soil rehabilitation in Chilimo dry afro-montane forest and adjacent land uses. A screening trial for fuel wood and rehabilitation of degraded lands was performed for four years (2005-2009) using: Acacia decurrens, Acacia saligna, Chamaecytisus palmensis, Dombeya torrida, Eucalyptus globulus, Grevillea robusta and Hagenia abyssinica under three soil management: control, manure and manure plus mulch. The experimental design was split plot, species as the main plot and treatments as subplot with three replicates. Data on survival rate, height growth and root collar diamater growth were taken annualy for selection experiment. Composite soil sampling was taken before and after intervension using augering method. Systematic random sampling technique was used for Chilimo natural forest under three forest patches: Chilimo, Gaji and Gallessa. One time inventory was conducted using 35 sampling plots in Chilimo dry afro-montane mixed natural forest and 9 plots in plantation. Both biometric and soil sampling data were collected in these plots. Data required for aboveground biomass equation, carbon concentration and wood density for Allophyllus abyssinicus, Olea europea ssp. cuspidiata, Olinia rochetiana, Scolopia theifolia and Ruth glutinosa were generated using distructive sampling. Soil chemical analyzed for % C, total N, P, K, Ca, Mg, pH and CEC following appropriate procedures. Carbon con-Study II Aboveground biomass equations for sustainable production of fuel wood in a native dry tropical afro-montane forest of Ethiopia

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Degraded Forests in Eastern Africa

Cited by 30 publications

References 0 publications

Effects of biochar on the growth of <i>Olea europaea</i> subsp. <i>cuspidata</i> and <i>Dodonaea angustifolia</i> planted in Tigray, northern Ethiopia

Effects of biochar on the growth of <i>Olea europaea</i> subsp. <i>cuspidata</i> and <i>Dodonaea angustifolia</i> planted in Tigray, northern Ethiopia

Agricultural Expansion and Intensification in the Foothills of Mount Kenya: A Landscape Perspective

Forest management options and carbon stock and soil rehabilitation in Chilimo Dry Afro-Montane forest, Ethiopia

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