استفاده از سنجش از دور در ارزیابی و آشکارسازی تغییرات پوشش‌گیاهی (مطالعه موردی: منطقه حفاظت شده ماله‌گاله (مله‌گاله))

محورهای موضوعی : آمایش سرزمین

غلامرضا سبزقبائی ¹ ( استادیار گروه محیط زیست دانشگاه صنعتی خاتم‌الانبیاء بهبهان، بهبهان، ایران. )
محمدجواد احسان دوست ² ( کارشناس ارشد آلودگی‌های محیط زیست دانشگاه صنعتی خاتم‌الانبیاء بهبهان، بهبهان، ایران. )
سیده سولماز دشتی ³ ( دانشیار گروه محیط زیست، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران. *(مسوول مکاتبات) )
عاطفه میر ⁴ ( مربی گروه محیط زیست، دانشکده محیط زیست، زابل، ایران. )
فریبا هدایت زاده ⁵ ( کارشناس ارشد آلودگی‌های محیط زیست دانشگاه صنعتی خاتم‌الانبیاء بهبهان، بهبهان، ایران. )

تاریخ دریافت : 1395/05/23 تاریخ پذیرش : 1395/10/15 تاریخ انتشار : 1401/10/01

کلید واژه: ماله‌گاله, سنجش از دور, TerrSet‌, پوشش جنگلی, تغییر کاربری اراضی, شاخص پوشش گیاهی,

چکیده مقاله :

زمینه و هدف: تکنیک سنجش از دور به دلیل ویژگی‌های خاص خود در ارایه سریع و ارزان اطلاعات پایه از اهمیت ویژه‌ای برخوردار است. سنجش از دور امروزه در مسایل مهمی مثل ساخت نقشه‌های مناطق و تصمیم‌گیری‌های درست کاربرد دارد. هدف از انجام این مطالعه آشکارسازی تغییرات پوشش گیاهی منطقه حفاظت شده مله گاله بوده است. روش بررسی: در پژوهش حاضر از تصاویر ماهواره‌ای لندست 7 سنجنده ETM+، سال های 2000 و 2010 استفاده شد و به بررسی تغییرات پوشش گیاهی با استفاده از نرم افزار TerrSet بدون در نظر گرفتن باغات و زمین های کشاورزی منطقه حفاظت شده ماله گاله پرداخته شده است. در این مطالعه، پس از تهیه تصاویر ماهواره ای لندست ETM+ برای دو سال 2000 و 2010 و انجام تصحیحات هندسی لازم بر روی آن ها، جهت استخراج پارامتر پوشش گیاهی، از نقشه اولیه حاصل از بارزسازی تصاویر استفاده شد. سپس با در نظر گرفتن نقشه کاربری اراضی منطقه و نقشه طبقه بندی شده حاصل از شاخص NDVI و با در نظر گرفتن پارامتر حداکثر احتمال، نقشه واقعیت زمینی مربوط به دو سال 2000 و 2010 تهیه شد. در نهایت با انجام روش تفاضل دو تصویر، میزان و چگونگی تغییرات نسبت به هم بررسی گردید. یافته ها: کمیت تغییرات در سال‌های 2000 و 2010 بررسی شد و مشخص گردید که در فاصله 10 سال، سطح پوشش گیاهی حفاظتی از 5/5278 هکتار به 25/25211 هکتار افزایش پیدا کرده و با روش تفاضل بین نقشه های نهایی، مشخص شد که تراکم پوشش گیاهی منطقه به میزان مساحت 17/181 هکتار کاسته شده، پوشش گیاهی 48/3417 هکتار از منطقه بدون تغییر بوده و در 59/21739 هکتار از منطقه پوشش گیاهی رشد داشته است. بحث و نتیجه گیری: نتایج نشان می دهد که تصاویر ماهواره ای مجهز به سنجنده ETM+ از قابلیت لازم جهت استخراج پوشش گیاهی به خصوص پوشش گیاهی مناطق جنگلی برخوردار بوده است. در بازه زمانی ده ساله تقریبا نزدیک به زمانی که منطقه حفاظت شده ماله گاله در فهرست مناطق چهارگانه حفاظت محیط زیست ایران قرار گرفته است تا سال 2010 پوشش گیاهی حفاظتی این منطقه افزایش پیدا کرده است.

چکیده انگلیسی:

Background and Objective: Remote sensing techniques due to their specific features in providing rapid and inexpensive basic information is very important. Remote sensing is used these days in the important issues like making maps of the regions and the right decision making. The aim of this study was to changes detection in vegetation of Maleh Galle protected area. Material and Methodology: In this study, satellite images of Landsat 7 ETM+, 2000 and 2010 were used and the vegetation changes using TerrSet software were considered regardless of the gardens and agricultural lands of the of, Maleh Galle protected area. In this study, after the preparation of Landsat ETM+ images for years 2000 and 2010 and necessary geometric corrections on them, for extract the parameters of vegetation cover, the original map was derived from processing images. Then, taking into account the classified land use map and map of NDVI index and keeping in mind the maximum likelihood parameter, ground truth map was prepared for the two years 2000 and 2010. Finally with two images difference method, the rate and the changes relation to each other investigated.     Findings: The quantity changes between the years of 2000 and 2010 were examined and it was found that within 10 years, the level of protective vegetation cover has been increased from 5278/5 hectares to 2521/25 hectares. With the Difference method between final maps, it was found that the density of vegetation area has been reduced to 181/17 hectares. 3417/48 hectares of Vegetation area remained unchanged and 21739/59 hectares of vegetation area has been grown. Discussion and Conclusion: Results showed that satellite images equipped with Landsat ETM+ has sufficient capabilities to extract vegetation cover, particularly vegetation of forest areas. In this nearly ten-year period, when the area was included in the list of protected areas in Iran, by 2010, the protected vegetation of region has been increased.                         

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