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توانایی شاخصهای گیاهی حاصل از دادههای سنجش از دور به منظور شناسایی و تفکیک مناطق سوخته شده در مراتع نیمه استپی استان چهار محال بختیاری | ||
نشریه علمی - پژوهشی مرتع و آبخیزداری | ||
دوره 74، شماره 4، اسفند 1400، صفحه 837-850 اصل مقاله (1.09 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/jrwm.2021.323095.1588 | ||
نویسندگان | ||
علی محمدیان* 1؛ اسماعیل اسدی بروجنی2؛ عطاالله ابراهیمی2؛ پژمان طهماسبی2؛ علی اصغر نقی پور برج3 | ||
1دانشجوی دکتری علوم مرتع دانشکده منابع طبیعی و علوم زمین، دانشگاه شهرکرد | ||
2دانشیار و عضو هیات علمی دانشکده منابع طبیعی و علوم زمین، دانشگاه شهرکرد | ||
3استادیار و عضو هیات علمی دانشکده منابع طبیعی و علوم زمین، دانشگاه شهرکرد | ||
چکیده | ||
امروزه استفاده از تصاویر ماهوارهای از کم هزینهترین و سریعترین روشهای ارزیابی مراتع میباشد. شاخصهای گیاهی از مهمترین ابزارهای سنجش از دوری هستند که جهت نظارت و ارزیابی تغییرات پوشش گیاهی بخصوص در دورههای زمانی پس از آتشسوزی و تهیه نقشههای مناطق آتشسوزی شده در مراتع کاربرد فراوان دارند. پژوهش حاضر با توجه به اهمیت و وسعت مراتع همچنین افزایش تعدد آتشسوزیهای سالیان اخیر در مراتع نیمهاستپی کشور بویژه مراتع استان چهارمحال بختیاری انجام گردید. هدف از این پژوهش تفکیک و شناسایی مناطق سوخته شده در دورههای 3-1 و 5-3 سال پس از آتشسوزی با استفاده از شاخصهای طیفی بمنظور اتخاذ برنامه مدیریتی مناسب پس از آتشسوزی در این مناطق میباشد. پس از محاسبه شاخصهای طیفی، پارامتر آماری M بمنظور تعیین توان تفکیکپذیری مناطق آتشسوزی شده از مناطق مجاور محاسبه گردید. نتایج بدست آمده نشان میدهد که در مراتع نیمهاستپی کشور به منظور شناسایی و تفکیک محدوده مناطق سوخته شده که دارای قدمت 1 تا 3 سال پس از آتشسوزی میباشند کاربرد شاخصهای طیفی NBRT، NBR و CSI میتواند با توجه به کارآیی بالا و توانایی مناسب در تفکیک این محدودهها قابل توصیه باشد. همچنین برای شناسایی و تفکیک محدودههای سوخته شده که قدمت 3 تا 5 سال را دارا میباشند کاربرد شاخصهای طیفی T.C. Brightness و NBRT میتوانند نتایج قابل قبولی را ارائه دهند. شاخص NBRT از بین شاخصهای مورد بررسی برای هر دو قدمت آتش در مراتع نیمهاستپی مورد مطالعه بمنظور تفکیکپذیری مناطق سوخته شده از مناطق مجاور توانایی بالایی داشته و قابل توصیه میباشد. | ||
کلیدواژهها | ||
تفکیکپذیری؛ چهار محال بختیاری؛ شاخصهای طیفی؛ منطقه سوخته؛ نیمه استپی | ||
مراجع | ||
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