کاربرد و مقایسه توابع انتقالی بین‌المللی برای خاک‌های استان مازندران و آذربایجان شرقی

نویسندگان

1 دانشجوی کارشناسی ارشد گروه خاکشناسی، دانشکده کشاورزی، دانشگاه بوعلی سینا- همدان

2 دانشیار گروه خاکشناسی، دانشکده کشاورزی، دانشگاه بوعلی سینا- همدان

3 دانشجوی سابق کارشناسی ارشد گروه خاکشناسی، دانشکده کشاورزی، دانشگاه بوعلی سینا- همدان

چکیده

در این مطالعه قابلیت کاربرد 16 سری از توابع انتقالی ایجاد‌شده توسط محققان مختلف برای تخمین منحنی مشخصه آب خاک [1](SWCC) 57 نمونه خاک از استان­های مازندران و آذربایجان شرقی مورد بررسی قرار گرفت. درصد رس، شن، سیلت، جرم مخصوص ظاهری و حقیقی، درصد کربن آلی و عمق نمونه‌برداری به‌عنوان پارامتر­های زودیافت و مقدار رطوبت در مکش­های مختلف و پارامتر­های مدل ون­گنوختن و بروکس و کوری به‌عنوان پارامترهای دیریافت خاک در نظر گرفته شدند. مقادیر اندازه­گیری‌شده و برآورد‌شده رطوبت در مکش­های مختلف با همدیگر مقایسه و  توابع انتقالی توسط شاخص­های آماری ارزیابی گردیدند. نتایج نشان داد که درصد رس، کربن آلی و جرم مخصوص ظاهری دارای همبستگی معنی­داری با غالب ضرایب منحنی‌های رطوبتی بودند.تابع کمپل و شیوزاوا که تابع انتقالی پارامتریک با متغیر­های ورودی درصد رس، شن و جرم مخصوص ظاهری بود با انتگرال جذر میانگین مربعات خطا (IRMSE)[2]  و معیار اطلاعات آکایک[3] AIC)) به‌ترتیب (cm3cm-3) 0676/0 و 3600- و تابع انتقالی پارامتریک مایر و جارویس  با متغیر­های ورودی درصد شن، رس، سیلت، کربن آلی و جرم مخصوص ظاهری با IRMSE و AIC به‌ترتیب (cm3cm-3) 2452/0 و1900- به‌ترتیب بهترین و بدترین نتایج تخمین رطوبت را در دامنه مکش صفر تا 15000 سانتی‌متر داشتند. نتایج این پژوهش نشان داد که می‌توان از برخی توابع انتقالی بین‌المللی جهت تخمین رطوبت برای خاک­های ایران استفاده نمود.
 

کلیدواژه‌ها


عنوان مقاله [English]

Application and Comparison of International Pedotransfer Functions for Mazandaran and East Azarbaijan Soils

نویسندگان [English]

  • S Majidi Ganji 1
  • H Bayat 2
  • A Sedaghat 3
1 M.Sc. Student, Dept. of Soil Science, Faculty of Agric., Bu Ali Sina University, Hamedan, Iran
2 Assoc. Prof., Dept. of Soil Science, Faculty of Agric., Bu Ali Sina University, Hamedan, Iran
3 Former M.Sc. Student, Dept. of Soil Science, Faculty of Agric., Bu Ali Sina University, Hamedan, Iran
چکیده [English]

           In this study, the applicability of 16 series of the developed pedotransfer functions for estimating soil water characteristic curve (SWCC) of 57 soil samples from Mazandaran and East Azarbaijan provinces were examined. Clay, sand and silt percentages, bulk density, soil particle density, organic carbon percentage and depth of sampling were used as readily available soil parameters to estimate the water contents at different matric suctions, while parameters of Brooks and Corey and van Genuchten models were considered as difficult to measure soil parameters. The measured and estimated water contents at the different matric suctions were compared with each other and the pedotransfer functions were evaluated by statistical criteria. The results showed that clay and organic carbon percentages and bulk density had significant correlations with the most of the coefficients of the Brooks and Corey and van Genuchten models. The Campbell and Shiosawa parametric pedotransfer functions with the inputs of clay and sand percentages and bulk density had the amounts of IRMSE=0.0676 cm3cm-3 and AIC= -3600 (the best model) and Mayr and Jarvis parametric pedotransfer functions with the inputs of clay, silt, sand and organic matter percentages and bulk density had the amounts of IRMSE= 0.2452 cm3cm-3 and AIC= -1900 (worst model), for the 0 to 15000 cm matric suctions. The results showed that some of international pedotransfer functions could be used to estimate the water content of Iranian soils.

کلیدواژه‌ها [English]

  • Estimation
  • Iran
  • Pedotransfer functions
  • Readily‌‌ available soil properties
  • Soil‌ water characteristic curve
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