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Regional Environmental Change

, Volume 15, Issue 6, pp 1105–1119 | Cite as

Impact of predicted changes in rainfall and atmospheric carbon dioxide on maize and wheat yields in the Central Rift Valley of Ethiopia

  • Alemayehu MulunehEmail author
  • Birhanu Biazin
  • Leo Stroosnijder
  • Woldeamlak Bewket
  • Saskia Keesstra
Original Article

Abstract

This study assesses potential impacts of climate change on maize and wheat yields in the Central Rift Valley (CRV) of Ethiopia. We considered effects of elevated atmospheric carbon dioxide (CO2) and changes in rainfall during the main (Kiremt) and the short (Belg) rainfall cropping seasons during the two future periods (2020–2049 and 2066–2095). The MarkSimGCM daily weather generator was used to generate projected rainfall and temperature data using the outputs from ECHAM5 general circulation model and ensemble mean of six models under A2 (high) and B1 (low) emission scenarios. Crop yield simulations were made with the FAO’s AquaCrop model. The projected rainfall during Kiremt increases by 12–69 % while rainfall during Belg decreases by 20–68 %. The combined effect of elevated CO2 and projected climate factors increases maize yield by up to 59 % in sub-humid/humid areas of the CRV, but could result in a decrease of up to 46 % in the semiarid areas under ECHAM5 model. However, the maize yield increases in all parts of the CRV under the ensemble mean of models. Wheat yield shows no significant response to the projected rainfall changes, but increases by up to 40 % due to elevated CO2. Our results generally suggest that climate change will increase crop yields in the sub-humid/humid regions of the CRV. However, in the semi-arid parts the overall projected climate change will affect crop yields negatively.

Keywords

Climate change Rainfall Belg Kiremt Elevated CO2 Crop yield 

Notes

Acknowledgments

The authors are grateful to the Netherlands Organization for International Cooperation in Higher Education (NUFFIC) and International Foundation for Science (IFS) for supporting the research financially. The authors would like to thank the Ethiopian National Meteorological Agency for providing the climate data. The authors are also thankful to Demie Moore for her language editorial support.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Alemayehu Muluneh
    • 1
    • 2
    Email author
  • Birhanu Biazin
    • 3
  • Leo Stroosnijder
    • 1
  • Woldeamlak Bewket
    • 4
  • Saskia Keesstra
    • 1
  1. 1.Soil Physics and Land Management GroupWageningen UniversityWageningenThe Netherlands
  2. 2.School of Biosystems and Environmental EngineeringHawassa UniversityHawassaEthiopia
  3. 3.International Livestock Research InstituteAddis AbabaEthiopia
  4. 4.Department of Geography and Environmental StudiesAddis Ababa UniversityAddis AbabaEthiopia

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