ارزیابی کیفی تناسب اراضی برای کاشت نخل خرمای کبکاب در استان فارس

نوع مقاله : مقالات پژوهشی

نویسندگان

1 موسسه تحقیقات علوم باغبانی،پژوهشکده خرما و میوه های گرمسیری

2 دانشگاه شهرکرد

چکیده

چکیده
 در روش فائو برای ارزیابی تناسب اراضی از منطق دو ارزشی بولین استفاده و اهمیت خصوصیت­های اراضی برای تعیین کلاس تناسب یکسان در نظر گرفته می­شود. در روش تحلیل سلسله مراتبی، معیارهای تأثیرگذار بر ارزیابی شناسایی و تأثیر نسبی هر کدام به صورت وزن نسبی تعیین می­شود. در روش تحلیل سلسله مراتبی فازی، به­منظور مدل­سازی عدم  قطعیت­ها، مجموعه­های فازی با مقایسه­های زوجی در فرآیند تحلیل سلسله مراتبی ترکیب می­گردد. این تحقیق با هدف ارزیابی کیفی تناسب اراضی برای کاشت نخل خرمای کبکاب با استفاده از دو روش فائو و ارزیابی چند معیاره در استان فارس اجرا گردید. نخلستان­های­ دارای نخل خرمای رقم کبکاب، به عنوان واحدهای اراضی انتخاب و در هرکدام از آنها کلاس­های کیفی تناسب تعیین و دقت روش­های به­کارگرفته شده مقایسه گردید. نتایج نشان داد متوسط درجه حرارت مرحله گل‌دهی و همچنین بافت خاک، کربن آلی، آهک و پتاسیم قابل جذب به ترتیب از مهمترین عوامل محدود کننده  اقلیم و خاک برای کاشت نخل خرما در منطقه مورد مطالعه محسوب می­گردند. در روش فائو (پارامتریک -فرمول ریشه دوم)، 10% و 90% نخلستان­ها به ترتیب در کلاس­های S2 و S3 قرار ­گرفتند. طبق روش‌ تحلیل سلسله مراتبی،  90% و  10% واحدهای اراضی به ترتیب در کلاس­های S1 و S2 و در روش‌ تحلیل سلسله مراتبی فازی، 100% آن­ها، در کلاس S2، طبقه­بندی ­شدند. ضرایب همبستگی بین مقادیر عملکرد واقعی و شاخص اراضی محاسبه شده برای روش­های تحلیل سلسله مراتبی فازی، تحلیل سلسله مراتبی و فائو به ترتیب 78/0، 57/0 و 38/0 بدست آمد.

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