Data/hora: 16/06/2024 04:10:25

Biblioteca(s): | Embrapa Amazônia Oriental.
Data corrente: | 17/01/2017
Data da última atualização: | 20/05/2022
Autoria: | ARAYA, A.; GIRMA, A.; DEMELASH, T.; MARTORANO, L. G.; HAILESELASSIE, H.; ABRAHA, A. Z.
Afiliação: | A. Araya, Mekelle University; Atkilt Girma, Mekelle University; Tsedale Demelash, Mekelle University; LUCIETA GUERREIRO MARTORANO, CPATU; Hailay Haileselassie, Mekelle University; Amanuel Zenebe Abraha, Mekelle University.
Título: | Assessing impacts of climate change on tef (Eragrostis tef) productivity in Debrezeit area, Ethiopia.
Ano de publicação: | 2015
Fonte/Imprenta: | International Journal of Agricultural Science Research, v. 4, n. 3, p. 039-048, Mar. 2015.
Idioma: | Inglês
Conteúdo: | Tef is one of the major staple food crops in Ethiopia. Tef productivity in semi arid areas has been limited by climate variability. Drought and other extreme climatic events are expected to increase under the future climate. However, the impact of climate change on tef yield has not been adequately documented. The objective of this study was thus to assess the impacts of climate change on tef productivity. Climate outputs from five General Circulation Models (GCMs) ("ACCESS1-0", "bcc-csm1-1", "CCSM4", "GFDL-ESM2M", and "HadGEM2-ES") with two Representative Concentration Pathway (RCP4.5 and RCP8.5) scenarios over three time periods: near (2010 ? 2039), mid (2040 ? 2069) and end term (2070 ? 2099) periods were used as data input in a calibrated AquaCrop model for simulating future tef yield under three sowing dates: early (July 18), normal (July 28) and late (August 19). Results of the model simulation showed that tef yield under climate change varied substantially with sowing date, time period, RCPs and GCMs. Median yields increased and decreased by up to 10% and 39% for early and late sowing, respectively during the end term period whereas it reduced by up to 4% and 50% for early and late sowing, respectively during the near term period. The main reason for the slight increase in yield with early sowing was due to efficient use of rainwater over the growing period; relatively conducive early seedling establishment and better synchronization of the crop growing cycle with the rainy period. Contrarily, late sowing showed an overall significant yield reduction which could be attributed to poor synchronization of the rainy period with the growing cycle of the crop (especially exposure to long dry period after the reproductive period). Simulated yield for the end term period was also relatively higher compared to the mid and near term period. This could be due to the increased positive impacts of CO2 as a result of increased CO2 concentration towards the end term period. Among the climatic factors, rainfall distribution and amount will have the greatest impact on tef yield under future time period. Early sowing should be considered as an adaptation strategy for tef under future climate.
Palavras-Chave: | Etiopia.
Thesagro: | Mudança Climática.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Amazônia Oriental (CPATU)
Exemplares: | CPATU - (53203-1) - UPC - AP - DD -  -  -  - DIS