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پایش تغییرات زمانی و مکانی پوشش‌گیاهی و ارتباط آن با متغیرهای اقلیمی (مطالعه موردی: استان فارس) | ||
| نشریه علمی - پژوهشی مرتع و آبخیزداری | ||
| دوره 75، شماره 3، آذر 1401، صفحه 409-427 اصل مقاله (2.16 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jrwm.2022.337022.1637 | ||
| نویسندگان | ||
| بهناز آصف جاه1؛ یحیی اسماعیل پور* 2؛ ام البنین بذرافشان3؛ حسین زمانی4 | ||
| 1دانشجوی دکتری مدیریت و کنترل بیابان، دانشکده مهندسی کشاورزی و منابع طبیعی،دانشگاه هرمزگان، بندرعباس، ایران | ||
| 2استادیار گروه مهندسی منابع طبیعی، دانشکده کشاورزی و منابع طبیعی دانشگاه هرمزگان، بندرعباس | ||
| 3دانشیار گروه مهندسی منابع طبیعی،دانشکده مهندسی کشاورزی و منابع طبیعی، دانشگاه هرمزگان، بندرعباس، ایران | ||
| 4استادیار گروه آمار ،دانشکده علوم پایه، دانشگاه هرمزگان، بندرعباس، ایران | ||
| چکیده | ||
| در دهه گذشته شاهد انقلابی بزرگ در پایش پوشش گیاهی با استفاده از تصاویر ماهواره‌ای بودیم که در نتیجه آن شاخص های کمی پوشش گیاهی با یک پردازش‌گر حرفه‌ای در یک محیط توسعه تعاملی مبتنی بر وب در دسترس کاربران قرار گرفت. در این مطالعه با استفاده از تولیدات MOD13A1 و MOD13Q1 سنجنده مودیس روند تغییرات زمانی و مکانی شاخص‌های NDVI و EVI استان فارس در بازه زمانی 16 روزه از سال 2000 تا 2020 به صورت ماهیانه در سامانه گوگل ارث انجین کد نویسی و مورد پردازش قرار گرفت. نتایج این مطالعه نشان داد نمایه میانگین شاخص NDVI از حداقل میانگین0.11- تا حداکثر 0.495 و نمایه میانگین شاخص EVI عدد 0.1 می‌باشد. بر اساس نتایج بدست آمده در این تحقیق در تمامی سال‌ها از 2000 تا 2020 در ماه ژانویه مقادیر NDVI وEVI نسبت به ماه‌های دیگر دارای بیشترین مقدار بود بطوریکه در ژانویه 2019 و ژانویه 2020 بیشترین مقدارEVI به طورمیانگین 0.22 و مقدار NDVI 0.18 برآورد گردید. کمترین مقادیر میانگین ماهانه هر دوشاخص در سال‌های 2000 تا 2005 اتفاق افتاده که نشان می دهد در این سال‌ها پوشش‌گیاهی به شدت تخریب یافته است. نتایج نشان داد ضریب همبستگی بین بارش و شاخص گیاهی NDVI مثبت و26/0 و ضریب همبستگی بین بارش و شاخص گیاهی EVI ،02/0 می‌باشد که نشان دهنده ارتباط مستقیم بین این دو متغییر بود. نتایج ضریب همبستگی دما و شاخص پوشش گیاهی NDVI 33/0- و شاخص EVI ، 07/0- نشان داد که رابطه بین شاخص پوشش گیاهی و دما غیر مستقیم می باشد | ||
| کلیدواژه‌ها | ||
| سنجنده MODIS؛ شاخص گیاهی؛ NDVI؛ EVI | ||
| عنوان مقاله [English] | ||
| Monitoring temporal and spatial changes of vegetation and its relationship with climatic variables (case study: Fars province) | ||
| نویسندگان [English] | ||
| Behnaz Asefjah1؛ Yahya Esmaeilpour2؛ Ommolbanin bazrafshan3؛ Hossein Zamani4 | ||
| 1PhD Student in Desert Management and Control, Faculty of Agricultural Engineering and Natural Resources, Hormozgan University, Bandar Abbas, Iran | ||
| 2Assistant Professor, Department of Natural Resources Engineering, Faculty of Agriculture and Natural Resources, University of Hormozgan, Bandar Abbas | ||
| 3Associate Professor, Department of Natural Resources Engineering, Faculty of Agricultural Engineering and Natural Resources, Hormozgan University, Bandar Abbas, Iran | ||
| 4Assistant Professor, Department of Statistics, Faculty of Basic Sciences, Hormozgan University, Bandar Abbas, Iran | ||
| چکیده [English] | ||
| The past decade has seen a major revolution in vegetation monitoring using satellite imagery, resulting in quantitative indicators of vegetation with a professional processor in a web-based interactive development environment. In this study, using MOD13A1 and MOD13Q1 products of Modis sensor, the trend of temporal and spatial changes of NDVI and EVI indices in Fars province in a period of 16 days from 2000 to 2020 was coded and processed monthly in Google Earth engine system. The results of this study showed that the average index of NDVI index is from minimum 0.11 to maximum 0.495 and the average index of EVI index is 0.1. According to the results obtained in this survey, in all the years from 2000 to 2020 in January, NDVI and EVI values had the highest values compared to other months, so that in January 2019 and January 2020, the highest EVI values averaged 0.22 and the NDVI values Was estimated to be 0.18. The lowest monthly average values of both indices occurred between 2000 and 2005, which indicates that the vegetation has been severely degraded during these years. The results of spatial changes using EVI index showed that the level of vegetation in Fars province in different months varied from 10,000 square kilometers to 22,000 square kilometers and from the perspective of NDVI index from 15,000 square kilometers to 30,000 square kilometers. | ||
| کلیدواژه‌ها [English] | ||
| MODIS sensor, Vegetation index, NDVI, EVI | ||
| مراجع | ||
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