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بررسی پاسخ ریشه ذرت به ترکیبات یونی مختلف با استفاده از توابع کاهش کلان | ||
| تحقیقات آب و خاک ایران | ||
| دوره 56، شماره 3، خرداد 1404، صفحه 685-700 اصل مقاله (1.85 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2025.384928.669833 | ||
| نویسندگان | ||
| ابوذر بذرافشان1؛ محمدحسین محمدی* 1؛ مهدی شرفا1؛ علی اصغر ذوالفقاری2 | ||
| 1گروه علوم و مهندسی خاک، دانشکده مهندسی و فناوری کشاورزی، دانشکدگان کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران | ||
| 2گروه بیابان‌زدایی، دانشکده کویرشناسی، دانشگاه سمنان، سمنان، ایران | ||
| چکیده | ||
| این تحقیق به منظور بررسی تنش شوری ترکیبات یونی کلرورسدیم+کلرورکلسیم و کلرورکلسیم بر وزن ریشه ذرت انجام شد. دو آزمایش گلخانه‌ای به طور موازی مربوط به هر ترکیب یونی در قالب طرح کاملا تصادفی با 4 تکرار انجام شد. سطوح شوری مختلف (0، 61، 126، 252 و 336 کیلوپاسکال) به صورت مشابه در هر دو ترکیب یونی اعمال شدند. بعد از شروع تیمارهای شوری، پتانسیل اسمزی گلدان‌ها ثابت نگه داشته شد. پاسخ ریشه ذرت با استفاده از پارامترهای شوری پتانسیل اسمزی، غلظت یون و قابلیت هدایت الکتریکی محلول خاک بررسی شد و سپس توسط مدل‌های خطی ماس-هافمن و غیرخطی ونگنوختن-هافمن ارزیابی شدند. تنش شوری به طور معنی‌دار وزن ریشه را در هر دو ترکیب یونی تحت تاثیر قرار داد. نتایج تحقیق نشان داد که پاسخ وزن ریشه ذرت به تنش شوری توسط پارامتر پتانسیل اسمزی بهتر از غلظت یون و قابلیت هدایت الکتریکی شرح داده می‌شود. بر اساس پتانسیل اسمزی مقدار حد آستانه شوری ترکیب یونی کلرورسدیم+کلرورکلسیم و ترکیب یونی کلرورکلسیم به ترتیب صفر و 49/2 کیلوپاسکال به دست آمد، که نشان‌دهنده تاثیر نوع یون بر حساسیت ریشه ذرت به تنش شوری می‌باشد. مقادیر وزن ریشه برآورد شده با استفاده از توابع کاهش نشان داد که دقت مدل نمایی ونگنوختن-هافمن در هر دو ترکیب یونی کلرورسدیم+کلرورکلسیم (71/4 (nRMSE = و کلرورکلسیم (69/5nRMSE = ) بالاتر از مدل خطی ماس-هافمن می‌باشد. همچنین کارایی برآورد مدل نمایی با 991/0 EF= بالاتر از مدل خطی با 98/0 EF=بود. | ||
| کلیدواژه‌ها | ||
| پتانسیل اسمزی؛ تنش شوری؛ قابلیت هدایت الکتریکی؛ غلظت یون | ||
| عنوان مقاله [English] | ||
| Investigation of maize root response to different ionic composition using macroscopic reduction functions | ||
| نویسندگان [English] | ||
| Abouzar Bazrafshan1؛ Mohammad Hosein Mohammadi1؛ Mahdi Shorafa1؛ Ali Asghar Zolfaghari2 | ||
| 1Department of Soil Science, Faculty of Agricultural Engineering and Technology, College of Agricultural and Natural Resources, University of Tehran, Karaj, Iran | ||
| 2Desertification Department, Faculty of Desert Science, University of Semnan, Semnan, Iran | ||
| چکیده [English] | ||
| In this study, our aim is to investigate the effect of salinity stress of NaCl+CaCl2 and CaCl2 ionic compositions in maize (Zea Mays L.) root mass. Two parallel greenhouse experiments were conducted in pots in a randomized complete design with 4 replicates. The different salinity levels (0, 61, 126, 252 and 336 kPa) were similarly applied in both ionic compositions. The osmotic potential in pots was kept constant after the treatment initiation. The maize root response was investigated using osmotic potential, ion concentration and electrical conductivity salinity parameters and then were evaluated by linear Maas-Hoffman and non-linear van Genuchten-Hoffman models. The imposed salinity stress significantly affected root mass in both NaCl+CaCl2 and CaCl2 ionic compositions. The results of this study revealed that osmotic potential is a more appropriate parameter than ion concentration and electrical conductivity for maize root response to salinity stress. Based on osmotic potential, the salinity threshold values of NaCl+CaCl2 and CaCl2 ionic compositions were obtained 0 kPa and 2.49 kPa, respectively which implies effect of ion type on sensivity of maize root mass to salinity stress. The estimated root mass values using reduction functions indicated that exponential model of van Genuchten-Hoffman in both NaCl+CaCl2 (nRMSE=4.71) and CaCl2 (nRMSE=5.69) ionic compositions had more accuracy than linear model of Maas-Hoffman. In addition, modeling efficiency of exponential model (EF=0.991) was larger than linear model (EF=0.98). | ||
| کلیدواژه‌ها [English] | ||
| electrical conductivity, ion concentration, osmotic potential, salinity stress | ||
| مراجع | ||
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