Disentangling the impacts of climate change, land use change and irrigation on the Central Rift Valley water system of Ethiopia

Getnet, Mezegebu; Hengsdijk, H.; Ittersum, M.K. van

doi:10.1016/j.agwat.2014.02.014

Cited by 42 publications

(46 citation statements)

References 19 publications

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“…The work of Getnet et al. () and Jansen et al. () also indicated a significant expansion of cultivated land during the 1990–2007 period at the expense of grassland and woodlands.…”

Section: Introductionmentioning

confidence: 93%

“…Significant LULC changes have been occurring at different levels of intensity in different parts of Ethiopia (Dessie & Kleman, ; Jansen et al., ; Muluneh & Arnalds, ; Dinka, ; Kindu et al., ; Kibret et al., ; Yesuf et al., ; Minta et al., ). Studies conducted in the Central Rift Valley (CRV) of Ethiopia have also illustrated the existence of LULC changes (Jansen et al., ; Garedew et al., ; Meshesha et al., ; Getnet et al., ). In the Arsi Negele District, for example, a LULC study conducted on changes from 1973 to 2003 revealed a considerable decline in woodland and wooded grassland cover, while the cropland area almost doubled (Garedew et al., ).…”

Section: Introductionmentioning

confidence: 99%

“…Because of LULC changes, the area has been and is currently facing several challenges (Legesse & Ayenew, ; Meshesha et al, ; Getnet et al., ). A study covering a wider area of the Rift Valley Lake basin depicted expansion of land degradation at rate of 60 km 2 /year (Meshesha et al., ).…”

Section: Introductionmentioning

confidence: 99%

“…It also noted increased annual rates of soil erosion of 31, 38, and 56 t/ha in 1973, 1985 and 2006, respectively. The LULC changes were recognized to adversely affect water quality and aquatic biodiversity of Lake Zeway and soil productivity (Legesse & Ayenew, ; Getnet et al., ). A linearly increasing temperature was reported by Kassie (); subsequently, also increasing evapotranspiration in the CRV (Getnet et al., ) is a potential factor exacerbating the problem.…”

Section: Introductionmentioning

confidence: 99%

“…The LULC changes were recognized to adversely affect water quality and aquatic biodiversity of Lake Zeway and soil productivity (Legesse & Ayenew, ; Getnet et al., ). A linearly increasing temperature was reported by Kassie (); subsequently, also increasing evapotranspiration in the CRV (Getnet et al., ) is a potential factor exacerbating the problem. Increasing demands for the limited water resources, and expansion of irrigated agriculture with intensive use of agrochemicals (Jansen & Harmsen, ) in the area, have also affected the water quality of Lake Zeway (Teklu et al., ).…”

Section: Introductionmentioning

confidence: 99%

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Tempo‐spatial land use/cover change in Zeway, Ketar and Bulbula sub‐basins, Central Rift Valley of Ethiopia

2018

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Understanding tempo-spatial dynamics of land-use/cover (LULC) and its drivers is instrumental in synthesizing knowledge for informed natural resource management planning and associated decisions. The present study investigates tempo-spatial LULC changes, their drivers and the associated impacts in three sub-basins (Zeway, Ketar and Bulbula) in the Central Rift Valley (CRV) of Ethiopia. Satellite imageries of different periods in ArcGIS, field observations, focus group discussions (FGDs) and secondary data were used to analyse the LULC dynamics, their drivers and associated impacts from 1973 to 2014. The overall accuracy of 1973, 2003 and 2014 classification maps was 88.7%, 88.9% and 91.6%, respectively. The analysis results revealed a continuous increase of farmland and town built-up areas at the expense of grasslands, shrub-bush land and woodlands. It further indicated area of open irrigated agriculture, increasing from none to 2.61% of the total area. The FGDs demonstrated agricultural land expansion, resettlement and wood extraction were proximate causes of the observed LULC changes. Population increases, changes in land tenure system and decreased farmland productivity were determined to be the underlying causes of the changes. The FGDs further indicated these changes have negatively affected the natural resources. The present study findings indicate the need to reconsider land-use decision tradeoffs between economic, social and environmental demands, and their implications for other similar areas in Ethiopia and beyond. Quantitative analysis and periodic evaluation of the drivers of such change and the impacts of existing and emerging land-uses in the face of changing climate is recommended to facilitate sustainable use of the fragile ecosystems in the Ethiopian CRV. K E Y W O R D S GIS, Lake Zeway, land-cover, land-use, satellite image | 77 ABERA Et Al.

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“…The work of Getnet et al. () and Jansen et al. () also indicated a significant expansion of cultivated land during the 1990–2007 period at the expense of grassland and woodlands.…”

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tempo‐spatial land use/cover change in Zeway, Ketar and Bulbula sub‐basins, Central Rift Valley of Ethiopia

2018

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Land Use/Cover Change Impacts on Hydrology in Large River Basins

Cuo

2016

Geophysical Monograph Series

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Productivity nutritive value and economic potential of irrigated fodder in two regions of Ghana

et al. 2021

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An on‐farm study was conducted in the northern and Upper East regions of Ghana to investigate the productivity and nutritive value of irrigated ruzi grass [Urochloa ruziziensis (R. Germ. and C.M. Evrard) Crins] (syn. Brachiaria ruziziensis (R. Germ. and C.M. Evrard)] and forage sorghum (Sorghum almum) grasses as options against dry season feed scarcity and to understand associated market opportunities. Sixty participating farmers each established 100‐m2 plots which were sown at 15 kg ha–1 drilled in 60‐cm rows in the dry season of 2016 and 2017. Irrigation was by flooding of soil surface every alternate day throughout the period of the trial. At both regions, herbage accumulation and nutritive value of forage species were determined at four harvesting stages: 4, 8, 12, and 16 weeks after planting (WAP) followed by 4‐wk intervals between harvests. At the end of the trial, fresh biomass was weighed, bundled, and sold in major livestock feed markets to estimate market price. Allowing forages to establish for only 8 wk resulted in two 4‐wk regrowth harvests with dry matter accumulation (DMA) ranging from 4.5 to 8.1 Mg DM ha–1 from both species and in both regions. Generally, herbage nutritive values in terms of crude protein, metabolizable energy (ME) concentration, and in vitro digestible organic matter (IVDOM) declined (P < .05) while DMA increased linearly with delay in harvest. While both grasses adapted well in the regions under irrigation, 8 WAP harvests provided the best balance between nutritive value and DMA. Irrigated fodder must be marketed more effectively since currently market prices are not closely related to nutritive value.

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Disentangling the impacts of climate change, land use change and irrigation on the Central Rift Valley water system of Ethiopia

Cited by 42 publications

References 19 publications

Tempo‐spatial land use/cover change in Zeway, Ketar and Bulbula sub‐basins, Central Rift Valley of Ethiopia

Tempo‐spatial land use/cover change in Zeway, Ketar and Bulbula sub‐basins, Central Rift Valley of Ethiopia

Land Use/Cover Change Impacts on Hydrology in Large River Basins

Productivity nutritive value and economic potential of irrigated fodder in two regions of Ghana

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