Evaluation of pedotransfer functions for estimating the soil water retention points
- Authors: Bahmani O.1, Palangi S.2
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Affiliations:
- Assistant professor, Department of Science and Water Engineering, Faculty of Agriculture
- M.S. Student, Department of Science and Water Engineering, Faculty of Agriculture
- Issue: Vol 49, No 6 (2016)
- Pages: 652-660
- Section: Soil Physics
- URL: https://journals.rcsi.science/1064-2293/article/view/223406
- DOI: https://doi.org/10.1134/S1064229316060028
- ID: 223406
Cite item
Abstract
Direct measurement of soil moisture has been often expensive and time-consuming. The aim of this study was determining the best method to estimate the soil moisture using the pedotransfer functions in the soil par2 model. Soil samples selected from the database UNSODA in three textures include sandy loam, silty loam and clay. In clay soil, the Campbell model indicated better results at field capacity (FC) and wilting point (WP) with RMSE = (0.06, 0.09) and d = (0.65, 0.55) respectively. In silty loam soil, the Epic model had accurate estimation with MBE = 0.00 at FC and Campbell model had the acceptable result of WP with RMSE = 0.03 and d = 0.77. In sandy loam, Hutson and Campbell models had a better result to estimation the FC and WP than others. Also Hutson model had an acceptable result to estimation the TAW (Total Available Water) with RMSE = (0.03, 0.04, 0.04) and MBE = (0.02, 0.01, 0.01) for clay, sandy loam and silty loam, respectively. These models demonstrate the moisture points had the internal linkage with the soil textures. Results indicated that the PTFs models simulate the agreement results with the experimental observations.
About the authors
Omid Bahmani
Assistant professor, Department of Science and Water Engineering, Faculty of Agriculture
Author for correspondence.
Email: omid.bahmani@basu.ac.ir
Iran, Islamic Republic of, Hamedan
Sahar Palangi
M.S. Student, Department of Science and Water Engineering, Faculty of Agriculture
Email: omid.bahmani@basu.ac.ir
Iran, Islamic Republic of, Hamedan