نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی طبیعت، دانشکده کشاورزی شیروان، دانشگاه بجنورد، بجنورد، ایران
2 گروه علوم و مهندسی محیط زیست. دانشکده کشاورزی و محیط زیست. دانشگاه اراک . اراک. ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Aim: Understanding the impact of drought on agricultural yields stands as a pivotal concern in the realm of food security. Consequently, this study utilized the drought identification index (RDI) and the effective drought identification index (eRDI), which integrates effective precipitation in its computations, to assess the output of dryland wheat in the province.
Material & Method: To incorporate effective precipitation, four distinct methods were applied, encompassing the approaches of the FAO, USBR, and two techniques adopted from the USDA. These metrics were applied using monthly rainfall and temperature data from meteorological stations within the province. A comparative analysis was conducted to evaluate the wheat production performance across various periods, and the correlation coefficient between these methods and wheat production yield was determined. Additionally, the yield trend of dryland wheat in different cities was studied using the Mann-Kendall test and Sen’s estimator.
Finding: The findings revealed minimal disparity among the diverse methods for determining effective precipitation. Moreover, the test statistic did not demonstrate a significant difference between the two examined metrics. Although the eRDI method displayed superior outcomes, the correlation coefficient analysis indicated that the production performance of each city is more sensitively affected by the precipitation values.
Conclusion: Similar outcomes to those of the investigated trends indicated an adverse trend in dryland wheat production at the Bojnord and Esfarayen stations, alongside an insignificant positive trend in other cities.
Innovation: This study's innovation lies in applying effective precipitation within the eRDI index and comparing various experimental methods to ascertain it for integration into the equations of the index. Given its unique climatic conditions and critical role in the nation's wheat production, this province assumes significant importance; however, limited research has been conducted on agricultural drought in this region thus far, highlighting the relevance of the issue in bolstering regional food security.
کلیدواژه‌ها [English]
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