Research article |
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Assessing the response of dryland barley yield to climate variability in semi-arid regions, Iran |
Mohammad KHEIRI1, Jafar KAMBOUZIA1,*(), Reza DEIHIMFARD1, Saghi M MOGHADDAM2, Seyran ANVARI1 |
1Department of Agroecology, Environmental Sciences Research Institute, Shahid Beheshti University, Tehran 1983963113, Iran 2Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Prague 16500, Czech Republic |
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Abstract Precipitation and temperature are the most abiotic factors that greatly impact the yield of crop, particularly in dryland. Barley, as the main cereal is predominantly cultivated in dryland and the livelihood of smallholders depends on the production of this crop, particularly in arid and semi-arid regions. This study aimed to investigate the response of the grain yield of dryland barley to temperature and precipitation variations at annual, seasonal and monthly scales in seven counties of East and West Azerbaijan provinces in northwestern Iran during 1991-2010. Humidity index (HI) was calculated and its relationship with dryland barley yield was evaluated at annual and monthly scales. The results showed that the minimum, maximum and mean temperatures increased by 0.19°C/a, 0.11°C/a and 0.10°C/a, respectively, while annual precipitation decreased by 0.80 mm/a during 1991-2010. Climate in study area has become drier by 0.22/a in annual HI during the study period. Negative effects of increasing temperature on the grain yield of dryland barley were more severe than the positive effects of increasing precipitation. Besides, weather variations in April and May were related more to the grain yield of dryland barley than those in other months. The grain yield of dryland barley was more drastically affected by the variation of annual minimum temperature comparing with other weather variables. Furthermore, our findings illustrated that the grain yield of dryland barley increased by 0.01 t/hm2 for each unit increase in annual HI during 1991-2010. Finally, any increase in the monthly HI led to crop yield improvement in the study area, particularly in the drier counties, i.e., Myaneh, Tabriz and Khoy in Iran.
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Received: 24 March 2021
Published: 10 September 2021
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Corresponding Authors:
*Jafar KAMBOUZIA (E-mail: J_Kambouzia@sbu.ac.ir)
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