بررسی رابطه عملکرد باغات انجیر دیم و مقادیر بارش موثر با استفاده از داده های سنجش از دور

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی آب، دانشکده فناوری کشاورزی، دانشکدگان کشاورزی و منابع طبیعی، دانشگاه تهران، تهران، ایران.

2 مؤسسه تحقیقات خاک و آب کرج، بخش آبیاری و فیزیک خاک، کرج، ایران.

10.22059/jwim.2024.372488.1146

چکیده

بارش مناسب می‌تواند در تأمین رطوبت خاک در انجیرستان‌های دیم بسیار مؤثر باشد. با این‌حال یکی از مشکلات در عمده مناطق دیم‌کاری کشاورزی، عدم در دسترس‌بودن داده‌های بارش می‌باشد که پایگاه داده‌های بارش ماهواره‌ای می‌تواند برای حل این مشکل کمک کند. محدوده جغرافیایی موردبررسی در این پژوهش انجیرستان‌های شهرستان استهبان بوده و از داده‌های بارش ایستگاه زمینی در مقاطع مختلف زمانی استفاده شد. در این پژوهش ابتدا ارتباط بین میزان عملکرد و توزیع شاخص بارش در مقیاس‌های گوناگون زمانی (ماهانه، فصلی و سالانه)، تعیین شد. سپس مقدار بارش ماهواره‌ای با استفاده از پایگاه داده‌های بارش شامل CHIRPS، ERA5، ERA5-Land، GPM، PERSIANN وGSMaP  تهیه شد و براساس این مقادیر میزان بارش مؤثر با استفاده از روش‌های مختلف شامل USDA، ET-Rainfall و بارش قابل اطمینان برای محدوده زمانی بین سال‌های 2005 الی 2021 برآورد شد. بر این اساس بارش در ماه‌های آوریل و سپس ماه می و نوامبر بیش‌ترین تأثیر را بر بهبود عملکرد محصول داشته است. هم‌چنین پیشنهاد می‌گردد در صورت اقدام به عمل آبیاری تکمیلی در ماه ابتدای بهار انجام گیرد. براساس معیارهای آماری موردبررسی، می‌توان گفت که GPM مناسب‌ترین پایگاه داده و روش USDA بهترین روش ارزیابی بارش مؤثر از بین گزینه‌های موردبررسی می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of the Relationship between Rainfed Fig Orchards Yield and Effective Precipitation using Remote Sensing Datasets

نویسندگان [English]

  • Faezeh Khoshrou 1
  • Behzad Azadegan 1
  • Shadman veysi 2
  • Mohammad Abdolahipour 1
1 Department of Water Engineering, Faculty of Agricultural Technology, College of Agriculture and Natural Resources, University of Tehran, Tehran, Iran.
2 Shadman Veysi, Soil and Water Research Institute, Agricultural Research, Education and Extension Organization, Karaj, Iran.
چکیده [English]

Appropriate precipitation can play a crucial role in providing soil water content in rainfed fig orchards. Meanwhile, one of the main problems in most rainfed agriculture areas is the unavailability of rainfall data, which satellite rainfall datasets can help to solve this problem. The area investigated in this research is rainfed fig orchards of Estahban and the rainfall data of the meteorological station located in the area was applied for different periods of time. In this research, first, the relationship between yield and distribution of precipitation values in different time scales (monthly, seasonal and annual) was determined. Then the amount of satellite-derived rainfall was found using the rainfall datasets (i.e. CHIRPS, ERA5, ERA5-Land, GPM, PERSIANN and GSMaP) and based on these values, the amount of effective rainfall was calculated using different methods including USDA, ET-Rainfall, and Dependable Rain for the time period range between 2005 and 2021. Results showed, the rainfall in the months of April and then in May and November has had the greatest effect on improving the yield of the crop. Additionally, it is recommended supplemental irrigation events at the beginning of spring to provide higher soil water content for fig orchards in drought conditions. Based on the analyzed statistical criteria, it can be said that GPM was the most suitable dataset and USDA was the best effective rainfall method among the investigated methods in the area.

کلیدواژه‌ها [English]

  • Effective precipitation
  • Estahban
  • GPM dataset
  • USDA method
  • Yield

مراجع

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مدیریت آب و آبیاری
دوره 14، شماره 3
آذر 1403
صفحه 615-627

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