تعیین حد آستانۀ کاهش عملکرد ریحان و ارزیابی مدل‌های جذب آب تحت شرایط تنش شوری

آب و خاک

مقاله 3، دوره 30، شماره 1 - شماره پیاپی 45، فروردین 1395، صفحه 30-40   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.v30i1.35583

نویسندگان

مهدی سرائی تبریزی¹؛ حسین بابازاده^{* 1}؛ مهدی همایی²؛ فریدون کاوه¹؛ مسعود پارسی نژاد³

¹دانشگاه آزاد اسلامی؛ واحد علوم وتحقیقات تهران

²تربیت مدرس

³دانشگاه تهران

چکیده

شوری منابع آب و خاک از چالش‌های مهم بخش کشاورزی در ایران است. در زمینه چگونگی پاسخ گیاهان به تنش‌ شوری، چند مدل‌ ریاضی وجود دارد. لیکن اغلب این مدل‌ها در شرایطی خاص کاربرد دارند. هدف از این پژوهش، برآورد آستانۀ کاهش عملکرد ریحان، مدل‌سازی واکنش گیاه ریحان به شوری و نیز ارزیابی کارآیی مدل‌های ریاضی موجود در برآورد عملکرد این گیاه بود. به همین منظور، آزمایشی با 13سطح مختلف شوری شامل شوری‌های 2/1، 8/1، 2، 2/2، 5/2، 8/2، 3، 5/3، 4، 5، 6، 8 و 10 دسی‌زیمنس بر متر انجام شد. تیمارهای شوری با استفاده از اختلاط آب رودخانه شور با آب شرب تهیه شد. به منظور کمّی کردن اثر شوری بر عملکرد محصول، از هفت مدل‌ ریاضی استفاده شد. نتایج نشان داد آستانه کاهش عملکرد ریحان نسبت به شوری خاک 25/2 دسی‌زیمنس بر متر و شیب خط کاهش عملکرد، 2/7 درصد بر دسی‌زیمنس بر متر می‌باشد. مدل ون‌گنوختن و هافمن (48) در شبیه‌سازی تابع کاهش عملکرد ریحان به شوری عصاره اشباع دقتی بیشتر نسبت به دیگر مدل‌ها داشت. به طور کلی، نتایج این پژوهش نشان داد که مدل‌های ون‌گنوختن و هافمن (48)، استپوهن و همکاران (44) و همایی و همکاران (13) برای شبیه‌سازی واکنش عملکرد ریحان به شوری عصاره اشباع خاک از دقتی مناسب برخوردارند.

کلیدواژه‌ها

توابع کاهش؛ مدل‌سازی؛ مدل‌های ریاضی

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