DOI: 10.1016/j.agwat.2020.106064
论文题名: Impacts of drought, food security policy and climate change on performance of irrigation schemes in Sub-saharan Africa: The case of Sudan
作者: Ahmed S.M.
刊名: Agricultural Water Management
ISSN: 3783774
出版年: 2020
卷: 232 语种: 英语
英文关键词: Aquacrop
; Eastern Africa region
; Optimization
; Regional climate models
Scopus关键词: Cotton
; Crops
; Drought
; Food supply
; Global warming
; Irrigation
; Optimization
; Rain
; Water management
; Water supply
; Agricultural policies
; Aquacrop
; Eastern Africa
; Increased temperature
; Management practices
; Reference evapotranspiration
; Regional climate models
; Scientific results
; Climate models
; agricultural policy
; air temperature
; cash cropping
; climate change
; cotton
; drought
; evapotranspiration
; food policy
; food security
; global warming
; irrigation system
; management practice
; optimization
; performance assessment
; rainfall
; regional climate
; soil fertility
; sustainability
; water management
; Gezira
; Sub-Saharan Africa
; Sudan
; Gossypium hirsutum
; Triticum aestivum
英文摘要: Owing to contradicted scientific results, trends in drought due to global warming have been assigned with medium confidence. Drought will likely continue inputting immense pressure on food security in fragile ecosystems like Sub-saharan Africa (SSA). As an adaptation measure to severe drought events since the 1980s, the overall goal of irrigated schemes (foreign exchange earnings) thus has been shifted to sustain food security. This study assessed the impacts of such drought-driven agricultural policy and future climate change on the performance of large irrigated schemes in SSA, with special emphasis on the Gezira scheme, GS (0.88 mha), Sudan. The optimized scenario of the baseline period, developed in GAMS (the general algebraic modeling system), showed that the expansion of food crops on the expensive of cash crops resulted in a reduction of 83 % in gross net benefits and loss of 63 % in irrigation water in the GS since the severe drought of 1984. The biased corrected rainfall and temperature outputs of three randomly selected regional climate models (RCMs) under unmitigated pathways (RCP 8.5), suggested increased rainfall of 40 mm, increased temperature of 3.3 °C and 5 % increase in reference evapotranspiration for the period 2040–2070, compared to the baseline (1960–1990). The predicted conditions experienced neither extreme drought nor extreme wet events; however, severe and moderately drought events remain a challenge up to 2060. Due to climate change and current water management practices, the FAO-Aquacrop predicted reductions in crop yields and water productivity, especially for cotton and sorghum of 40 and 29 % respectively. Optimized future crop scenarios indicate that food crops such as sorghum and wheat are not viable. Cash (cotton) and soil fertility maintenance crops (groundnuts) would be better for sustaining economic viability. The agricultural policy and water management practices thus should be revisited to keep pace with future climate changes. © 2020 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158451
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Water Management and Irrigation Institute, University of Gezira, P.O. Box 20, Wadmedani, Sudan
Recommended Citation:
Ahmed S.M.. Impacts of drought, food security policy and climate change on performance of irrigation schemes in Sub-saharan Africa: The case of Sudan[J]. Agricultural Water Management,2020-01-01,232