Diversity and production of Ethiopian dry woodlands explained by climate- and soil-stress gradients

Eshete, Abeje; Sterck, Frank J.; Bongers, Frans

doi:10.1016/j.foreco.2011.01.021

Cited by 68 publications

(80 citation statements)

References 42 publications

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“…Sasikumar et al (2002) indicated that the phenolic acids and volatile oils released from the leaves, bark, and roots of certain Eucalyptus species have deleterious effects on other plant species. This finding is similar to Eshete et al (2011) who reported that most of Eucalyptus species have acidifying effect on the soil properties. On the other hand, the higher acidity (lower pH) in cultivated land compared with forest land was probably due to continuous removal of basic cations by crops, crops' harvest enhanced leaching of basic cations, and washed away of exchangeable bases by soil erosion.…”

Section: Effect Of Land Use Change On Soil Chemical Properties Soil Psupporting

confidence: 92%

Soil organic carbon variation in relation to land use changes: the case of Birr watershed, upper Blue Nile River Basin, Ethiopia

2018

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Background: This study investigated the variation of soil organic carbon in four land cover types: natural and mixed forest, cultivated land, Eucalyptus plantation and open bush land. The study was conducted in the Birr watershed of the upper Blue Nile ('Abbay') river basin. Methods: The data was subjected to a two-way of ANOVA analysis using the general linear model (GLM) procedures of SAS. Pairwise comparison method was also used to assess the mean difference of the land uses and depth levels depending on soil properties. Total of 148 soil samples were collected from two depth layers: 0-10 and 10-20 cm. Results: The results showed that overall mean soil organic carbon stock was higher under natural and mixed forest land use compared with other land use types and at all depths (29.62 ± 1.95 Mg C ha − 1 ), which was 36.14, 28.36, and 27.63% more than in cultivated land, open bush land, and Eucalyptus plantation, respectively. This could be due to greater inputs of vegetation and reduced decomposition of organic matter. On the other hand, the lowest soil organic carbon stock under cultivated land could be due to reduced inputs of organic matter and frequent tillage which encouraged oxidation of organic matter. Conclusions: Hence, carbon concentrations and stocks under natural and mixed forest and Eucalyptus plantation were higher than other land use types suggesting that two management strategies for improving soil conditions in the watershed: to maintain and preserve the forest in order to maintain carbon storage in the future and to recover abandoned crop land and degraded lands by establishing tree plantations to avoid overharvesting in natural forests.

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Section: Effect Of Land Use Change On Soil Chemical Properties Soil Psupporting

confidence: 92%

Soil organic carbon variation in relation to land use changes: the case of Birr watershed, upper Blue Nile River Basin, Ethiopia

2018

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“…Due to its use in the production of perfumes and pharmaceuticals, frankincense is internationally traded and is one of the export commodities of Ethiopia, Sudan and Eritrea (Coppen 2005;Lemenih 2005;Ogbazghi et al 2006;Abtew et al 2012). In Ethiopia, B. papyrifera tree stands occur mainly in the North, Northeast, Northwest and Western parts of the country (Eshete et al 2011;Girma et al 2013) and in Combretum-Terminalia and Acacia-Commiphora woodlands. B. papyrifera is a widespread, slow growing and long-lived (>100 years) species (Tolera et al, 2013).…”

Section: Study Speciesmentioning

confidence: 99%

“…In many areas in Ethiopia, the natural stands of B. papyrifera now consist of fragmented patches of trees because of land-use changes, grazing, fire and adult mortality. Populations in Northern (Abergele) and Northwestern (Metema) Ethiopia are suffering from lack of saplings and small trees (Abiyu et al 2010;Eshete et al 2011;Groenendijk et al 2012;Tolera et al 2013). In these Boswellia populations, non-permanent seedlings (seedlings of which the shoots die back during the dry season and reappear in the rainy season) are abundant, but they do not develop to the sapling stage mainly because of the impacts of frequent forest fire and intensive grazing in the area (Groenendijk et al 2012;Tolera et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Fine-scale spatial genetic structure in the frankincense tree Boswellia papyrifera (Del.) Hochst. and implications for conservation

Addisalem

Duminil

Wouters

et al. 2016

Tree Genetics & Genomes

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The fine-scale genetic structure and how it varies between generations depends on the spatial scale of gene dispersal and other fundamental aspects of species' biology, such as the mating system. Such knowledge is crucial for the design of genetic conservation strategies. This is particularly relevant for species that are increasingly fragmented such as Boswellia papyrifera. This species occurs in dry tropical forests from Ethiopia, Eritrea and Sudan and is an important source of frankincense, a highly valued aromatic resin obtained from the bark of the tree. This study assessed the genetic diversity and fine-scale spatial genetic structure (FSGS) of two cohorts (adults and seedlings) from two populations (Guba-Arenja and Kurmuk) in Western Ethiopia and inferred intrapopulation gene dispersal in the species, using microsatellite markers. The expected heterozygosity (H E ) was 0.664-0.724.The spatial analyses based on kinship coefficient (F ij ) revealed a significant positive genetic correlation up to a distance of 130 m. Spatial genetic structure was relatively weak (Sp = 0.002-0.014) indicating that gene dispersal is extensive within the populations. Based on the FSGS patterns found, we estimate indirectly gene dispersal distances of 103 and 124 m for the two populations studied. The high heterozygosity, the low fixation index and the low Sp values found in this study are consistent with outcrossing as the (predominant) mating system in B. papyrifera. We suggest that seed collection for ex situ conservation and reforestation programmes of B. papyrifera should use trees separated by distances of at least 100 m but preferably 150 m to limit genetic relatedness among seeds from different trees. Communicated by F. GugerliElectronic supplementary material The online version of this article

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“…The population of Kaftahumera has grown significantly from 48,690 in 1994 to over 110,000 in 2014 more than double in a period of two decades [CSA, 2014]. The woody vegetation of northwest Ethiopia is characterized by the association of Combretum-Terminalia and Acacia-Commiphora woodlands [WBISPP, 2004;Eshete et al, 2011] of which B. papyrifera is the most abundant tree species within the Combretum-Terminalia woodland. The current study area is a corridor of the SudanoSahelian Zone, which is known for its recurrent drought, high dust movement and low rainfall [Middleton, 1985].…”

Section: Study Areamentioning

confidence: 99%

Remote Sensing based multi-temporal land cover classification and change detection in northwestern Ethiopia

Zewdie¹,

Csaplovies²

2015

European Journal of Remote Sensing

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Diversity and production of Ethiopian dry woodlands explained by climate- and soil-stress gradients

Cited by 68 publications

References 42 publications

Soil organic carbon variation in relation to land use changes: the case of Birr watershed, upper Blue Nile River Basin, Ethiopia

Soil organic carbon variation in relation to land use changes: the case of Birr watershed, upper Blue Nile River Basin, Ethiopia

Fine-scale spatial genetic structure in the frankincense tree Boswellia papyrifera (Del.) Hochst. and implications for conservation

Remote Sensing based multi-temporal land cover classification and change detection in northwestern Ethiopia

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