بررسی تغییرات کاربری اراضی با استفاده از رویکرد اکولوژی سیمای سرزمین (مطالعه موردی: حوزه‌ی سد زاگرس در گیلانغرب)
محورهای موضوعی : ارزیابی پی آمدهای محیط زیستی
پریسا پیروزی نژاد
1
(دانشجوی کارشناسی ارشد ارزیابی و آمایش سرزمین، دانشکده کشاورزی و منابع طبیعی، دانشگاه اردکان، اردکان، ایران. )
مریم مروتی
2
(دانشیار گروه علوم و مهندسی محیط زیست، دانشکده کشاورزی و منابع طبیعی، دانشگاه اردکان، اردکان، ایران. *(مسوول مکاتبات))
نوشین پیروزی نژاد
3
(کارشناس مسئول اداره مطالعات آبخیزداری استان کرمانشاه، کرمانشاه،ایران.)
کلید واژه: توسعه کشاورزی, تغییرات کاربری اراضی, ارزیابی تغییرات, سد زاگرس, کرمانشاه.,
چکیده مقاله :
زمینه و هدف: حوزه آبخیز سد زاگرس در استان کرمانشاه در شهرستان‌های دالاهو، سرپل ذهاب، اسلام‌آباد غرب و گیلانغرب محصور است و در دهه گذشته تغییرات شدید کاربری اراضی را تجربه کرده است. هدف مطالعه، بررسی تغییرات کاربری اراضی با استفاده از سنجه¬های اکولوژی سیمای سرزمین، به علت تغییر جنگل¬های بلوط زاگرس و ارائه داده¬ها و نبود زمین کشاورزی و فرسایش خاک و سیلابی بودن منطقه بوده است. روش بررسی: در این مطالعه از تصاویر ماهواره لندست 8 در سال‌های 2010 و 2020 استفاده شد. پس از انجام پیش¬پردازش¬های لازم برای تصاویر، نمونه¬های تعلیمی به کمک تصاویر رنگی کاذب(FCC) و شاخص پوشش¬گیاهی(NDVI) شناسایی شدند. طبقه‌بندی به کمک 730 نقطه تعلیمی از طبقات کاربری کشاورزی، جنگل، مراتع و مناطق مسکونی به روش‌های شبکه عصبی -مصنوعی(ANN)، ماشین¬بردار پشتیبان(SVM) و تئوری حداکثر احتمال(Maximum Likelihood) انجام گرفت. سنجه‌های سیمای سرزمین در دو سطح کلاس و سیمای سرزمین به کار گرفته شد و تغییرات رخ‌داده در سیمای سرزمین کمی شد. پس از محاسبه تغییرات با استفاده زنجیرهMarkov پتانسیل تغییرات بین کاربری‌های مختلف برای سال 2030 به دست آمد. یافته¬ها: براساس نتایج، کاربری کشاورزی در سال 2010 مساحت 43/23933 هکتار داشت که به 09/25344 هکتار در سال 2020 افزایش پیدا کرد، که نشان‌دهنده غالبیت این کاربری در تغییرات رخ‌داده است. کاربری جنگل و مراتع روندی کاهشی داشتند. سنجه‌های سیمای سرزمین در حوزه نیز آشکارکننده تغییرات محسوس در سطح کلاس و سیمای سرزمین بود. متریک آنتروپی بی‌نظمی و آشفتگی در مرز کاربری‌های طبیعی مانند جنگل‌ها و مراتع از سال 2010 تا 2020 روندی افزایشی داشته است. سنجه تعداد لکه(NP) و سنجه پیوستگی(CONTAG) نشان دادند که تغییرات رخ‌داده در محدوده سد زاگرس به سمت تکه‌تکه-شدگی سیمای سرزمین و همچنین کاهش پیوستگی آن بوده است. بحث و نتیجه¬گیری: روند آینده تغییرات کاربری اراضی به سمت غالبیت کشاورزی و کاهش اراضی طبیعی میل خواهد کرد که لازم است دستگاه‌های اجرایی متولی کنترل بیشتری بر روی تخریب اراضی طبیعی حاشیه زمین‌های کشاورزی داشته باشند.
Background and Objective: The Zagros Dam watershed in Kermanshah Province is enclosed by the cities of Dalaho, Sarpol Zahab, Islamabad Gharb and Gilan Gharb and has experienced drastic land use changes in the last decade. The aim of the study was to investigate the changes in land use using land surface ecology measures, due to the change in Zagros oak forests and data provision, lack of agricultural land, soil erosion and flooding in the area. Material and Methodology: Landsat 8 satellite images from 2010 and 2020 were used in this study. After the necessary image pre-processing, educational patterns were identified using false-colour imagery (FCC) and vegetation index (NDVI). Classification was done using 730 training points from agricultural, forest, pasture and residential areas using Artificial Neural Network (ANN), Support Vector Machine (SVM) and Maximum Likelihood Theory. Land surface measurements were used at two levels of class and landscape, and the changes that occurred in the landscape were quantified. After calculating the changes using the Markov chain, the potential of changes between different land uses was obtained for the year 2030. Findings: ¬ According to the results, the area of agricultural land use in 2010 was 23,933.43 hectares, which increased to 25,344.09 hectares in 2020, indicating the dominance of this land use in the changes that occurred. Forest and pasture land use showed a decreasing trend. Field measurements of the land surface also revealed significant changes in the class level and the landscape. The entropy metric of disorder and disturbance at the boundary of natural land uses such as forest and pasture showed an increasing trend from 2010 to 2020. The measure of the number of patches (NP) and the measure of continuity (CONTAG) showed that the changes that occurred in the area of the Zagros Dam were towards the fragmentation of the landscape and also towards the reduction of its continuity. Discussion and Conclusion: The future trend of land use change will be towards the predominance of agricultural land use and the reduction of natural land use, so it is necessary for the relevant executive bodies to have more control over the destruction of natural land at the edge of agricultural land.
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