برآورد رطوبت ظرفیت زراعی و نقطه پژمردگی دائم گیاه با استفاده از داده‌های استوانه‌های دوگانه و حل عددی معکوس در بافت‌های مختلف خاک

نوع مقاله : مقاله پژوهشی

نویسنده

بخش تحقیقات خاک و آب، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان اصفهان، سازمان تحقیقات، آموزش و ترویج کشاورزی، اصفهان، ایران

چکیده

در این پژوهش از نرم­افزار HYDRUS- 2D/3D برای برآورد نقاط ظرفیت زراعی (FC) و نقطه پژمردگی دائم (PWP) با استفاده از رویکرد حل معکوس، استفاده شد. برای این منظور، داده­های نفوذ تجمعی اندازه­گیری­شده به روش استوانه­های دوگانه در 95 نقطه از مناطق مختلف استان اصفهان به عنوان ورودی مدل مورد استفاده قرار گرفت. خاک­های مورد مطالعه در هفت کلاس بافتی شامل لوم­شنی (SL)، رسی (C)، لوم (L)، لوم سیلتی (SiL)، لوم رسی (CL)، لوم رس سیلتی (SiCL) و رس سیلتی (SiC) قرار گرفتند. در اکثر نمونه­ها مقادیر شبیه­سازی­شده FC و PWP کمتر از مقدار اندازه­گیری­شده آنها بود. نتایج نشان داد که کمترین میزان خطا در برآورد نقاط FC  مربوط به بافت SL (884/0= R2 و 021/0=RMSE) و بیشترین خطای برآورد FC مربوط به بافت C (1/0= R2 و 122/0=RMSE) بود. همچنین کمترین خطای برآورد نقاط PWP  مربوط به بافت L (858/0= R2 و 003/0=RMSE) و بیشترین خطای برآورد PWP مربوط به بافت C (21/0= R2 و 025/0=RMSE) بود. در کل میزان خطای شبیه­سازی با افزایش میزان رس در خاک و سنگین­تر شدن بافت خاک افزایش پیدا کرد. همچنین در همه خاک­ها مقادیر PWP شبیه­سازی­شده نسبت به مقادیر FC شبیه­سازی­شده، همخوانی نسبتا بیشتری با مقادیر اندازه­گیری­شده آنها داشت. مقادیر ضریب تبیین برای FC و PWP در همه خاک­ها به ترتیب معادل 77/0 و 80/0 بود. در کل روش حل عددی معکوس از دقت قابل قبولی برای برآورد FC و PWP به ویژه در خاک­های دارای بافت سبک برخوردار بود.

کلیدواژه‌ها


عنوان مقاله [English]

Estimation of Field Capacity and Permanent Wilting Point of Plant Using Double-Rings Data and Inverse Numerical Solution in Different Soil Textures

نویسنده [English]

  • parisa MASHAYEKHI
Soil and Water Research Department, Isfahan Agricultural and Natural Resources Research and Education Center. Agricultural Research, Education and Extension organization (AREEO), Isfahan, Iran.
چکیده [English]

In this study, HYDRUS-2D/3D software was used to estimate the field capacity (FC) and permanent wilting point (PWP) using double-rings infiltration data via inverse solution. For this purpose, the double rings infiltration data obtained from 95 points of different regions in Isfahan were used as model input. The studied soils were classified into seven textural classes including Sandy Loam (SL), Clay (C), Loam (L), Silty Loam (SiL), Clay Loam (CL), Silty Clay Loam (SiCL), and Silty Clay (SiC). For most soil samples, the simulated values ​​of FC and PWP were less than the measured values. The results showed that the lowest error value in estimating FC was related to SL texture (R2 = 0.884 and RMSE = 0.021) and the highest error value for FC estimation was related to Clay texture (R2 = 0.1 and RMSE = 0.122). Furthermore, the lowest and the highest error values for PWP estimation were observed in Loam (R2 = 0.858 and RMSE = 0.003) and Clay (R2 = 0.21 and RMSE = 0.025) soils, respectively. In general, the simulation error increased with increasing clay content in the soil. The estimated PWP values ​​were relatively more consistent than the estimated FC values with their measured values, in all soil samples. Coefficients of determination (R2) were 0.77 and 0.80 for FC and PWP in all soils, respectively. In general, the inverse numerical solution method had acceptable accuracy for estimating FC and PWP, especially in light textured soils.

کلیدواژه‌ها [English]

  • Double Rings
  • HYDRUS-2D/3D
  • Plant available water
  • simulation
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