کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6773179 | 1431825 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Improved thermo-time domain reflectometry method for continuous in-situ determination of soil bulk density
ترجمه فارسی عنوان
روش بازتابنده دامنه دمای زمانی برای تعیین چگالی فله خاک در محدوده زمانی بهبود یافته است
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی
Quantifying the dynamics of surface soil bulk density (Ïb) is important for characterizing water, heat, and gas exchanges in agricultural and environmental applications. Unfortunately, very few approaches are available for continuous in-situ monitoring of Ïb. The soil heat capacity-based (C-based) thermo-time domain reflectometry (thermo-TDR) approach has been used to measure Ïb in-situ, but this approach gives Ïb estimates with relatively large errors. In this study, we present a new soil thermal conductivity-based (λ-based) thermo-TDR approach for continuous and automatic determination of Ïb variation in-situ. An error analysis, literature data, and field experiments were used to evaluate the performance of the C-based and λ-based approaches. The error analysis undertaken on hypothetical soils indicated that the new λ-based approach was less sensitive to errors in the measurement inputs than was the C-based approach when the same relative errors occurred, except on very dry soils. Thermo-TDR measurements reported in the literature on seven soils showed that the new λ-based approach provided more accurate and precise Ïb estimates, with coefficient of determination (R2) of 0.70 and root mean square error (RMSE) of 0.103â¯Mgâ¯mâ3, than did the C-based approach which gave Ïb with R2 of 0.32 and RMSE of 0.178â¯Mgâ¯mâ3. Two field experiments were conducted to test the performance of the new λ-based thermo-TDR approach for monitoring Ïb dynamics. The results showed that following tillage surface Ïb increased by about 35% within 40 days. The Ïb obtained by the λ-based thermo-TDR approach agreed well with independent core sampling measurements, with an average RMSE of 0.122â¯Mgâ¯mâ3. The C-based approach failed to give acceptable Ïb estimates in most cases because of probe deflection and environmental factors. We conclude that the new λ-based thermo-TDR approach is a promising method for continuous in situ measurements of Ïb.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil and Tillage Research - Volume 178, May 2018, Pages 118-129
Journal: Soil and Tillage Research - Volume 178, May 2018, Pages 118-129
نویسندگان
Zhengchao Tian, Yili Lu, Tusheng Ren, Robert Horton, Joshua L. Heitman,