واسنجی و اعتبارسنجی مدل WAVE در شبیه‌سازی اجزای بیلان نیتروژن خاک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد آبیاری وزهکشی، مهندسی آب، دانشگاه گیلان، رشت، ایران

2 استادیار، گروه مهندسی آب، دانشگاه گیلان، رشت، ایران

چکیده

کاربرد مدل­ها در توصیف روابط آب، خاک و گیاه تحت شرایط مختلف، باعث سهولت بررسی سناریوهای گوناگون مدیریتی و تعیین حالت بهینه به­منظور استفاده حداقل از نهاده­های گران­قیمت تولید برای دستیابی به حداکثر عملکرد شده است. با توجه به اینکه مطالعات مزرعه­ای زمان­بر و هزینه­بر هستند و گاهی اوقات نتایج آن تحت تأثیر شرایط غیرقابل کنترل محیطی قرار می­گیرند بنابراین استفاده از مدل­های کارآمد در توصیف فرآیندهای پیچیده ناشی از اثرات متقابل آب، خاک و گیاه می­تواند راهگشا باشد. هدف از این تحقیق کاربرد مدل WAVE[1] به­منظور تعیین اجزای بیلان نیتروژن و شبیه­سازی ذخیره رطوبت خاک در طول فصل زراعی ذرت در سال 2007 و همچنین اجزای بیلان نیتروژن خاک بدون پوشش از زمان برداشت محصول ذرت تا زمان کشت فصل زراعی بعد (میان فصل 2008-2007) است. این تحقیق در موسسه تحقیقاتی ایرستیا در شهر مونپلیه فرانسه در دوره زمانی 2008-2007 صورت گرفت. مقادیر خروجی مدل شامل شاخص سطح برگ (95/0r2= )، ذخیره آب خاک (96/0r2= ) و میزان نیتروژن نهایی خاک (اختلاف حداکثر 6/0 کیلوگرم در هکتار) با مقادیر اندازه­گیری شده تطابق قابل قبولی را نشان داد. همچنین براساس شاخص­های آماری nRMSE[2] و NSE[3] در خصوص واسنجی ذخیره آب خاک که به­ترتیب معادل 7 درصد و 95/0 حاصل شدند، کارایی مدل در رده عالی ارزیابی می­گردد.



[1] .Water and Agrochemicals in the soil, crop and Vadose Environment


[2] .Normalozed Root Mean Square Error


[3] .Nash- Sutcliffe Efficiency

کلیدواژه‌ها

عنوان مقاله [English]

Calibration and Validation of WAVE Model for Simulating Components of Soil Nitrogen Balance

نویسندگان [English]

  • N. Zare 1
  • M.R. Khaledian 2
1 M. Sc. student of irrigation and drainage, University of Guilan
2 Assistant Professor., Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran
چکیده [English]

Using models to interpret soil-water-plant relationships under different conditions enable us to study the different management scenarios and then determine the optimum option, which help us to reduce the costs and to improve the benefits. As experimental studies are time consuming and expensive and the results are often affected by uncontrollable environmental conditions, using models to describe the complicated relationships between soil, water, and plant can be a suitable solution. The aim of this study was to use WAVE Model to predict nitrogen balance components and simulation of soil water reserve over a corn crop season in 2007 and also in the period between 2007 harvest and the next crop of 2008.  This study was done in the Irstea experimental station in the Southern France in 2007-2008 period.  Results showed an appropriate agreement between measured and model simulations of leaf area index (r2=0.95), soil water reserve (r2=0.96), and final soil nitrogen content (by maximum difference of 0.6 kg N.ha-1). Also, in calibration process for soil water reserve simulation, according to nRMSE and NSE indices, which were, respectively, 7 % and 0.95, the performance of the model was excellent.

کلیدواژه‌ها [English]

  • Water movement
  • Solute transport in soil
  • Modeling
  • Nitrate leaching

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پژوهش های خاک
دوره 28، شماره 1
شهریور 1393
صفحه 101-111

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