Effects of slope gradient and changes in land use/cover on selected soil physico-biochemical properties of the Gerado catchment, north-eastern Ethiopia

Asmamaw, Legass; Assen, Mohammed

doi:10.1080/00207233.2012.751167

Cited by 32 publications

(40 citation statements)

References 14 publications

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“…Upper elevations contained more sand and silt particles, while the lower elevations were dominated by clay particles (Table 2). Asmamaw and Mohammed (2012) reported similar results. A Pearson correlation coefficient analysis confirmed that clay, silt and sand fractions were significantly correlated with elevation: r=0.76 (p<0.01), r=0.60 (p<0.01) and r=0.46 (p<0.05) respectively.…”

Section: Impacts Of Lc Types and Topographic Position On Soil Physicasupporting

confidence: 63%

Impact of land cover changes and topography on soil quality in the Kasso catchment, Bale Mountains of southeastern Ethiopia

Warra

Ahmed

Nicolau

2015

Singap J Trop Geogr

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This study assessed land cover change and topographic elevation on selected soil quality parameters in the Kasso catchment, southeastern Ethiopia. Twenty-seven soil samples collected from 0-30cm depth under four land cover types across three elevation gradients were analysed for selected soil quality parameters. Results indicated that soil particle size distribution is different (p<0.001) in the catchment because of the effect of land cover change and elevation. Most cultivated lands occupy lower elevations where clay accumulates as a result of its movement from higher to lower elevations. Ploughing accentuates weathering, making cultivated lands richer in finer materials. Cation exchange capacity and exchangeable magnesium and potassium negatively correlated with elevation, total nitrogen and available phosphorous. Conversion of natural vegetation to cropland contributed to changes in pH (p<0.05), exchangeable calcium (p<0.01), potassium (p<0.001), available phosphorous (p<0.01) and nitrogen (p<0.01) contents. Parameter soil degradation index results showed that soil organic carbon, nitrogen, available phosphorous and exchangeable potassium contents declined and bulk density increased because of the land cover change. This negative effect on agricultural development and environmental health of the catchment makes an integrated land resource management approach indispensable for sustaining agricultural productivity and the environmental health of the Kasso catchment.

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Section: Impacts Of Lc Types and Topographic Position On Soil Physicasupporting

confidence: 63%

Impact of land cover changes and topography on soil quality in the Kasso catchment, Bale Mountains of southeastern Ethiopia

Warra

Ahmed

Nicolau

2015

Singap J Trop Geogr

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“…The impact of LULC and elevation variations on SQ indicators is site specific (Teferi et al, 2016), and hence, there is discrepancy in the findings. Some studies revealed that LULC variation has adverse impacts on SQ indicators (Gebrelibanos, Assen, 2013;Asmamaw, Mohammed, 2013;Lemenih, Itanna, 2004). Conversely, some others reported that LULC variation has no impact on some SQ indicators.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Selected Soil Quality Indicators in Response to Land Use/Cover and Elevation Variations in Wanka Watershed, Northwestern Ethiopian Highlands

Abera

Assen

2019

Ekológia (Bratislava)

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Abera W., Assen M.: Dynamics of selected soil quality indicators in response to land use/cover and elevation variations in Wanka watershed, northwestern Ethiopian highlands. Ekológia (Bratislava), Vol. 38, No. 2, p. 126-139, 2019. Soil quality (SQ) dynamics assessment vis-à-vis land use/land cover (LULC) and elevation variations in Ethiopia is desirable as elevation impact on land use is highly pronounced. This study examined SQ indicators dynamics across LULC and elevation variations. For this, surface soil samples (0−20 cm) were collected from the recognized LULC categories of different elevations in Wanka watershed, northwestern Ethiopian highlands. Both disturbed and undisturbed soil samples that were taken from three adjacent LULC (natural forest, grazing and cultivated lands) and elevation (2238-2300, 2400-2600, and 2700-2800) classes analysed for the selected physicochemical SQ indicators. Two-way ANOVA, Tukey's multiple comparison test and SQ deterioration index were computed. The impact of LULC and elevation was found significant on key SQ indicators. In cultivated and grazing lands, soil organic matter (SOM) and soil nutrients like total nitrogen declined significantly (p < 0.01). Conversely, bulk density increased significantly (p < 0.01). The divalent basic cations (Ca 2+ and Mg 2+ ), cation exchange capacity and pH significantly (p < 0.01) decreased in upper elevation. Synergetic effect of LULC and elevation variations was found significant (p < 0.01) on SOM, total nitrogen, available phosphorus, water content at field capacity and soil particle distribution (silt and clay). Thus, elevation specific land management strategies that improve these SQ indicators need to be emphasized.

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“…The LULC maps are used in a variety of application areas. These include watershed management (40), hydrology (31), lowland management (21), highland management (20), urban studies (12), social studies (12), forest management (6) and agriculture (4). This implies that authors find the LULC analysis quite important for water-related applications such as watershed management or surface and groundwater hydrology in Ethiopian river basins like the Upper Blue Nile, Tekeze, Awash, Baro, Ghibe and Rift Valley Lakes basins.…”

Section: Systematic Literature Reviewmentioning

confidence: 99%

“…Of the 146 publications, 36 were from peer reviewed journals with environmental themes such as Science of the Total Environment [37][38][39][40]; Agriculture, Ecosystems and Environment [41][42][43]; Environmental Monitoring and Assessment [7,41,[44][45][46]; Environmental Systems Research [47][48][49]; Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 23 July 2018 doi:10.20944/preprints201807.0431.v1…”

Section: Systematic Literature Reviewmentioning

confidence: 99%

“…This implies that authors find the LULC analysis quite important for water-related applications such as watershed management or surface and groundwater hydrology in Ethiopian river basins like the Upper Blue Nile, Tekeze, Awash, Baro, Ghibe and Rift Valley Lakes basins. Most studies were done in Upper Blue Nile River basin [37,40,43,45,47,[55][56][57][58][59][60][61][62], followed by studies in the Central and Rift Valley Lakes basin [63][64][65][66][67]. Given most of the reviewed studies focus on mid-to high-altitude regions, we evaluated the accuracy of six of the available national to global scale LULC products in the BMNP area, which ranges between 1,500 and 4,385 m a.s.l (see Table 4, Fig.…”

Section: Systematic Literature Reviewmentioning

confidence: 99%

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Availability of Global and National Scale Land Cover Products and Their Accuracy in Mountainous Areas of Ethiopia: A Review

Hailu

Fekadu

Nauß

2018

Preprint

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A large variety of remote sensing-based land use/land cover (LULC) products are currently available on national and global scales. This literature review and in-situ validation study evaluates the suitability of these products for local scale applications in the complex terrain of the Ethiopian mountains. For the review, 146 research papers were analyzed. Most studies (73%) have been published since 2013 and are based on individually computed maps. Not a single study relied on readily available LULC products. Nine readily available LULC products with 20, 30, 300, 500 and 1,000 m spatial resolution have been identified at national and global scales. To complement and extend this body of research, the recent (since 2013) LULC products were validated using 185 ground truth points collected in the Bale Mountains National Park between 1,500 and 4,385 m a.s.l. The results indicate a rather poor overall accuracy (<50%).

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Effects of slope gradient and changes in land use/cover on selected soil physico-biochemical properties of the Gerado catchment, north-eastern Ethiopia

Cited by 32 publications

References 14 publications

Impact of land cover changes and topography on soil quality in the Kasso catchment, Bale Mountains of southeastern Ethiopia

Impact of land cover changes and topography on soil quality in the Kasso catchment, Bale Mountains of southeastern Ethiopia

Dynamics of Selected Soil Quality Indicators in Response to Land Use/Cover and Elevation Variations in Wanka Watershed, Northwestern Ethiopian Highlands

Availability of Global and National Scale Land Cover Products and Their Accuracy in Mountainous Areas of Ethiopia: A Review

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