تبیین ضریب وزنی برای محدودیت شوری در مفهوم گنجایش جمعی آب (IWC)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مهندسی علوم خاک، دانشکده مهندسی و فناوری، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

2 گروه مهندسی علوم خاک، دانشکده مهندسی و فناوری، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

3 گروه مهندسی علوم خاک، دانشکده مهندسی و فناوری، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج ، ایران

چکیده

 هدف از این پژوهش، ارائه یک ضریب وزنی جهت لحاظ­کردن محدودیت شوری در جذب آب توسط گیاه (ωsi) برای مفهوم گنجایش جمعی آب خاک (IWC) می‌باشد. این آزمایش در شرایط گلخانه و شامل کشت گیاه ذرت در دو نوع خاک، سه سطح شوری (5/1، 4 و 8 دسی­‌زیمنس بر متر) و سه تکرار می‌باشد. پس از استقرار کامل گیاهان، همه گلدان‌ها با شوری مشخص به طور پیوسته آبیاری شدند. مقادیر تعرق، از اختلاف مقادیر آبیاری، وزن گلدان‌ها و مقادیر آب زهکشی­شده در زمان‌های مختلف به­ دست آمد. تعرق تجمعی در هر زمان محاسبه و در برابر شوری آب زهکشی در همان زمان ترسیم شد. سپس با استفاده از مشتق عددی منحنی‌های تعرق تجمعی، منحنی شدت تعرق به ­دست آمد. با برازش یک مدل لگاریتمی و نسبی­سازی آن‌ها، تأثیر محدودیت شوری بر تعرق محاسبه و به ‌عنوان یک ضریب وزنی جدید شوری پیشنهاد شد. نتایج حاصل از ωsi به‌دست‌آمده نشان داد که جذب آب نسبی با افزایش شوری به صورت لگاریتمی کاهش می‌یابد و حدود تحمل به شوری گیاه ذرت در خاک‌های با خصوصیات مختلف، متفاوت است و نمی‌‌توان یک مقدار ثابت را به عنوان حد تحمل به شوری گزارش نمود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Explanation of the Weighting Factor for Salinity Constraint in the Integral Water Capacity Concept (IWC)

نویسندگان [English]

  • zahra asadi 1
  • Mohammad Hosein Mohammadi 2
  • MEDI SHORAFA 3
  • Mohsen Farahbakhsh 3
1 Department of Soil Science., University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
2 Department of Soil Science., University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
3 Department of Soil Science., University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
چکیده [English]

The purpose of this study is to present a weighting factor for considering limitation of salinity on plant water uptake (ωsi) for the concept of Integral Water Capacity (IWC). The experiment was conducted under greenhouse conditions and included corn planting in two soil types, three salinity levels (1.5, 4, and 8 dS m-1), and three replications. After the plants were fully established, all pots were continuously irrigated with a specific salinity. The transpiration values were obtained from the weight differences of pots considering water mass balance components at different times. Cumulative transpiration was calculated at each time step and they were plotted against the drainage water salinity at the same time. Then, using the numerical derivative of the cumulative transpiration curves, the transpiration intensity curve was calculated. By fitting a logarithmic model and their relativization, the effect of salinity constraint on the transpiration was calculated and a new salinity weighting coefficient was proposed. The results of ωsi showed that the relative water uptake decreased logarithmically with increasing salinity and the salinity tolerance of corn varied in soils with different properties and a constant value cannot be reported as salinity tolerance.

کلیدواژه‌ها [English]

  • water uptake
  • Salinity stress
  • Available water
  • Corn
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