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برآورد رطوبت ظرفیت زراعی و نقطه پژمردگی دائم گیاه با استفاده از دادههای استوانههای دوگانه و حل عددی معکوس در بافتهای مختلف خاک | ||
تحقیقات آب و خاک ایران | ||
دوره 52، شماره 7، مهر 1400، صفحه 1753-1763 اصل مقاله (1.44 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2021.318649.668888 | ||
نویسنده | ||
پریسا مشایخی* | ||
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 | ||
آب قابل استفاده گیاه؛ استوانههای دوگانه؛ شبیهسازی؛ نرمافزار HYDRUD-2D/3D | ||
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 | ||
نویسندگان [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 | ||
مراجع | ||
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