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ارزیابی مدلهای AquaCrop و SALTMED در تخمین عملکرد محصول ذرت و شوری خاک | ||
تحقیقات آب و خاک ایران | ||
مقاله 12، دوره 46، شماره 3، مهر 1394، صفحه 487-498 اصل مقاله (1.34 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2015.56738 | ||
نویسندگان | ||
محمد حسن لی1؛ پیمان افراسیاب2؛ حامد ابراهیمیان* 3 | ||
1دانشجوی دکتری آبیاری و زهکشی گروه مهندسی آب دانشگاه زابل | ||
2استادیار گروه مهندسی آب دانشگاه زابل | ||
3استادیار گروه مهندسی آبیاری و آبادانی دانشگاه تهران | ||
چکیده | ||
استفاده از مدلهای شبیهسازی یکی از راهکارهای مدیریت مصرف آب در کشاورزی و پیشبینی اثر آبهای شور بر عملکرد محصول و شوری خاک است. اخیراً فائو نسخة جدید مدل AquaCrop را ارائه کرده است که میتواند اثر آبیاری با آب شور را بر میزان عملکرد محصول و شوری خاک محاسبه کند. در این تحقیق دو مدل AquaCrop و SALTMED در شرایط استفاده از آب شور در تناوب با آب شیرین برای کشت گیاه ذرت علوفهای ارزیابی شد. بدین منظور آزمایش مزرعهای برای نُه تیمار (در شرایط مختلف کاربرد آب شور و شیرین) در منطقة کرج انجام شد و عملکرد محصول و شوری پروفیل خاک اندازهگیری و با دو مدل مذکور شبیهسازی شد. مقدار R2 برای شوری خاک و عملکرد محصول در مدل SALTMED به ترتیب برابر 843/0 و 733/0 و برای مدل SALTMED به ترتیب برابر 758/0 و 846/0 به دست آمد. خطای نسبی مدل AquaCrop در تخمین عملکرد محصول از 9/2 تا 8/30 درصد و در تخمین شوری خاک از 9/5 تا 8/45 درصد متغیر بود. همچنین خطای نسبی مدل SALTMED در تخمین عملکرد محصول از 9/0 تا 7/24 درصد و در تخمین شوری خاک از 2/2- تا 2/38 درصد متغیر بود. | ||
کلیدواژهها | ||
آبیاری قطرهای؛ ذرت علوفهای؛ شبیهسازی؛ کاربرد تناوبی آب شور | ||
مراجع | ||
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