ارزیابی رابطه بارش تجمعی و عملکرد گندم و جو با استفاده از شاخص یکنواختی در منطقه نیمه‌خشک مشهد

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استاد گروه زراعت، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران

2 دانشجوی دکتری اگرواکولوژی، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران

3 دانشجوی دکتری هواشناسی کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران

4 دانشجوی دکتری هواشناسی کشاورزی، دانشگاه فردوسی مشهد، مشهد، اییران

چکیده

تحلیل تصویری پراکندگی الگوی بارندگی در هر مکانی منجر به اظهار نظرهای ذهنی و مبهمی می‌شود. بنابراین یافتن شاخص‌های مفید با توانایی توضیح و تفسیر بهتر پراکندگی و الگوی بارش به منظور افزایش درک ما از الگوی بارش، ضروری به نظر می‌رسد. در مطالعه اخیر، رابطه بین شاخص‌ها و عملکرد دو گیاه زراعی گندم و جو در طول دوره 30 ساله 1363 – 1392 در مشهد ارزیابی شده است. شاخص‌های یکنواختی برای دو دوره کاشت تا مرحله برداشت و مرحله بحرانی رشد گندم و جو (گرده‌افشانی) محاسبه شد. مرحله بحرانی محدود به یک دوره 30 روزه گرده‌افشانی گیاهان از می تا ژوئن (اواسط خرداد تا اوسط تیر) بود. نتایج بیانگر این است که عملکرد گندم و جو همبستگی معنی‌داری با شاخص ER (شیب خط یکنواختی: میانگین بارش روزانه در طول دوره رشد گیاه زراعی) (تا 5/0) دارد. در حالی­که همبستگی میان عملکرد گندم و جو با شاخص UR (شاخص توزیع نابرابر بارش) وجود نداشت. اما، هنگامی که شاخص یکنواختی بر اساس میانگین بارش روزانه وزن داده شد (UR/ER)، همبستگی منفی معنی‌داری (45/0-r=) مشاهده شد. همبستگی بین شاخص‌های یکنواختی (UR) و عملکرد گندم و جو در دوره بحرانی گرده افشانی در حدود 48/0 بود. که نشان‌دهنده بهبود دقت این شاخص در شرایط انتخاب درست دوره بحرانی و تاثیر بارندگی در این دوره بر عملکرد گیاهان زراعی می‌باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluating The Relationship Between Cumulative Rainfall and Yield of Wheata and Barley Using a Evenness Index in The Semi-Arid Region of Mashhad

نویسندگان [English]

  • Mohammad Bannayan 1
  • Sara Asadi 2
  • Hassan Salehi 3
  • Saeidehe Koozegaran 4
1 Professor, Faculty of Agriculture, Department of Agronomy, Ferdowsi University of Mashhad., Mashhad., Iran
2 PhD Student of Agroecoloy, Department of Agronomy, Ferdowsi University of Mashhad., Mashhad., Iran
3 Ph.D. student of Agricultural Meteorology, Ferdowsi University of Mashhad., Mashhad., Iran
4 Ph.D. student of Agricultural Meteorology., Ferdowsi University of Mashhad., Mashhad., Iran
چکیده [English]

Rainfall pattern in any location has its own distribution, while visual analysis of that can lead to subjective and vague statements. So, finding usefull indices which can explain rainfall distribution is an urgent to better interpret rainfall pattern. Some indices are calculated based on the distance between cumulative rainfall curves and the respective theoretical evenness rainfall lines, which join the lowest and highest cumulative rainfall values within the considered period. In present study the relationship between the indices and yield of two major crops (wheat and barley) are evaluated over a 30-year period (1984-2013) in Mashhad. The indices were applied for two periods (the planting to the harvest of crop and critical stage). Critical stage was limited to 30 days from May-Jun. Results showed that both crops were significantly related to ER (the slope of the evenness line) (up to 0.5), while they were not related to UR (uneven distribution index rainfall). When the evenness index was weighted on the mean daily rainfall, the slope of the evenness line declined (up to 0.45). Significant correlations were also found by calculating the indices over strategic short-term periods for crops (up to 0.48), which indicates that how the effectiveness of these indices may be improved by choosing appropriate periods for different crops.

کلیدواژه‌ها [English]

  • Cereal Yield
  • Cumulative precipitation
  • Evenness index

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