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بررسی روند تغییر پوششگیاهی در فلات مرکزی ایران به کمک سریهای زمانی ماهوارهای بین سال های 2002 -2018 | ||
نشریه محیط زیست طبیعی | ||
دوره 75، شماره 4، آبان 1401، صفحه 613-627 اصل مقاله (1.68 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/jne.2022.340325.2409 | ||
نویسندگان | ||
مریم ذوالفقاری1؛ بهزاد رایگانی* 2؛ باقر نظامی بلوچی1؛ حمید گشتاسب2؛ علی جهانی2 | ||
1گروه محیط زیست طبیعی و تنوع زیستی، دانشکده محیط زیست کرج، کرج، ایران | ||
2گروه ارزیابی و مخاطرات محیط زیستی، پژوهشکده محیط زیست و توسعه پایدار، سازمان حفاظت محیط زیست، تهران، ایران | ||
چکیده | ||
پوشش گیاهی از مجموعههایی که بهصورت خود به خود در حال رشد هستند، تشکیل شده است. محصولات شاخص پوششگیاهی مودیس (MODIS (VI)) در چندین مطالعه سیستم رصد زمین (EOS)، نقش عمدهای ایفا میکنند. هدف از پژوهش حاضر، ارزیابی روند تغییرات پوشش گیاهی در محدودة فلات مرکزی ایران با استفاده از سری زمانی دادههای سنجش از دور است. استفاده از این دادهها که مربوط به سنجندة مودیس (MOD13A2) MODIS) و ماهواره ترا (Terra) هستند، 16 روزه بوده و با قدرت تفکیک مکانی 1 کیلومتر ارائه میشوند، در طی سالهای 2018 -2002 انجام پذیرفت. برای این منظور از معنیداری روشهای منکندال و همبستگی خط پارامترهایی مانند حداکثر پوشش گیاهی ماهانه و حداکثر پوشش گیاهی سالانه بر اساس حداکثر پوشش گیاهی ماهانه در سطح 1 درصد استفاده شد. این دو روش بررسی معنیداری، نتایج مشابهی نشان دادند، از اینرو، بررسی روند تغییرات پوشش گیاهی با استفاده از هر دو آنها امکانپذیر است. با توجه به خشک و نیمهخشک بودن منطقه، براساس مطالعات مشابه، شاخص پوشش گیاهی PVI1 مناسبترین شاخص پوششگیاهی در منطقة مورد مطالعه تشخیص داده شد. بررسی روند معنیداری این شاخص پوشش گیاهی نشان داد در محدودة فلات مرکزی ایران، افزایش معنیداری پوششگیاهی در استانهای قم، سمنان، خراسان جنوبی، اصفهان و یزد قابل مشاهده است (مقادیر ضریب همبستگی، بزرگتر از 0/18+ برای تصاویر ماهانه و اعداد بیشتر از 0/606+ برای تصاویر سالانه (سطح معنیداری یک درصد)). چنین کاهش معنیداری پوششگیاهی در استانهای خراسان رضوی، قم، اصفهان و یزد مشاهده گردید (مقادیر ضریب همبستگی کمتر از 0/18- برای تصاویر ماهانه و اعداد کوچکتر از 0/606- برای تصاویر سالانه (سطح معنیداری یک درصد). نتایج این مطالعه مناطق حساس و آسیب دیدة فلات مرکزی ایران را بهخوبی نشان داد که در آینده میتواند در مدیریت بهتر پوششگیاهی موثر باشد. | ||
کلیدواژهها | ||
تحلیل روند؛ ماهوارة ترا؛ معنیداری منکندال؛ معنیداری همبستگی خطی؛ مودیس | ||
عنوان مقاله [English] | ||
Investigating the trend of vegetation change in the Central Plateau of Iran with the help of remotely sensed time series between 2002-2018 | ||
نویسندگان [English] | ||
Maryam Zolfaghary1؛ Behzad Rayegani2؛ Bagher Nezami Balouchi1؛ Hamid Gostasb2؛ Ali Jahani2 | ||
1Department of Biodiversity and Natural Environment , College of Environment, Karaj, Iran | ||
2Department of Assessment and Environment Risks, Research Center of Environment and Sustainable Development, Tehran, Iran | ||
چکیده [English] | ||
Vegetation consist of collections with spontaneous growing. MODIS vegetation index plays an essential role in several studies about EOS (Earth Observation System). The aim of this research is evaluation of vegetation trends in Central Plateau of Iran. This aim was done by remote sensing data and time series. Using the data are related to (MOD13A2) MODIS sensor and Terra satellite and they are 16 days with spatial resolution 1km during 2002 to 2018. For this purpose, we used from significance of Mann Kendall and linear correlation parameters such as maximum monthly vegetation maximum annually vegetation based on maximum monthly vegetation at 1% level were used. Analyses show the similarity between two significant methods, so considering of vegetation trend is possible with using both of them. Regarding arid and semiarid of the region, based on similar study, PVI1 vegetation trend is considered as a suitable vegetation in the area of study. Considering significant trend of this vegetation indicates that in Central Plateau of Iran, increasing of significant in vegetation in Qom, Semnan, South Khorasan, Esfahan and Yazd provinces are visible (Values greater than +0.18 for monthly images and numbers greater than +0.606 for annual images). Also, decreasing significant of vegetation was observed in Khorasan-e Razavi, Qom, Esfahan and Yazd provinces (Values less than -0.18 for monthly images and numbers smaller than -0.606 for annual images). Result of this study indicates sensitive and vulnerable regions in Central Plateau of Iran that can be effective in better management of vegetation in the future. | ||
کلیدواژهها [English] | ||
Trend evaluation, Terra, Mann-Kendall, Significant of linear correlation, MODIS | ||
مراجع | ||
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