ادغام معیارهای چشم انداز و سنجش از دور شی گرا به منظور تعیین نوع محصول و ترتیب زمین های کشاورزی
الموضوعات :رضوان صفدری 1 , علی رضا سوفیانیان 2 , سعید پورمنافی 3
1 - دانشجوی دکتری محیط زیست، گروه محیط زیست، دانشکده منابع طبیعی و محیط زیست، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران. *(مسوول مکاتبات)
2 - دانشیار، گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان، ایران.
3 - استادیار، گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان، ایران.
الکلمات المفتاحية: قطعه بندی, سنجه های سیمای سرزمین, اصفهان, نوع کشت. ,
ملخص المقالة :
زمینه و هدف: این مطالعه به شناسایی نوع کشت و چیدمان مکانی اراضی کشاورزی در واحد هیدرولوژیک دشت سگزی در استان اصفهان، ایران پرداخته است.
روش بررسی: با توجه به تقویم رویشی و چرخه های فنولوژیکی محصولات عمده در منطقه مورد مطالعه شامل گندم، یونجه، درختان میوه و سبزیجات و همچنین اندازه اراضی کشاورزی، 3 تصویر سنجنده OLI ماهواره ی لندست در سال 2015 مورد استفاده قرار گرفت. پس از تصحیحات و پیش پردازشهای اولیه، از شاخص گیاهی NDVI و الگوریتم قطعه سازیMulti-resolution از سه معیار رنگ، مقیاس و شکل استفاده شد تا محدوده اراضی کشاورزی تعیین گردد. سپس با توسعه یک درخت تصمیم گیری بر مبنای شاخص NDVI، محصولات عمده شناسایی، نقشه سازی و صحت آنها مورد ارزیابی قرار گرفت. در ادامه از سنجه های سیمای سرزمین شامل تعداد لکه (NP)، متوسط اندازه لکه (MPS)، شاخص شکل (MSI)، نسبت محیط به مساحت (PARA) و متوسط نزدیکترین فاصله (MNN) استفاده شد تا به بررسی ساختار و چیدمان اراضی کشاورزی پرداخته شود.
یافته ها: نتایج این تحقیق نشان داد که سطح وسیعی از زمینهای کشاورزی (حدود 46 درصد) در منطقه به کشت گندم و کمتر از 8 درصد آن به کشت سبزیجات اختصاص یافته است. همچنین نتایج نشان داد که کلیه اراضی منطقه دارای شکل منظم هندسی با حداقل مقدار محیط به مساحت هستند.
بحث و نتیجه گیری: خروجی این مطالعه گویای حرکت سیمای سرزمین کشاورزی در منطقه به سمت تک کشتی است. همچنین کمبود منابع آبی در سالهای اخیر نیز یک سیمای سرزمین تکه تکه شده را تشکیل داده اند.
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