Modeling soil bulk density through a complete data scanning procedure: Heuristic alternatives
Por:
Shiri, Jalal, Keshavarzi, Ali, Kisi, Ozgur, Karimi, Sepideh, Iturraran-Viveros, Ursula
Publicada:
1 jun 2017
Categoría:
Water science and technology
Resumen:
Soil bulk density (BD) is very important factor in land drainage and
reclamation, irrigation scheduling (for estimating the soil volumetric
water content), and assessing soil carbon and nutrient stock as well as
determining the pollutant mass balance in soils. Numerous pedotransfer
functions have been suggested so far to relate the soil BD values to
soil parameters (e.g. soil separates, carbon content, etc). The present
paper aims at simulating soil BD using easily measured soil variables
through heuristic gene expression programming (GEP), neural networks
(NN), random forest (RF), support vector machine (SVM), and boosted
regression trees (BT) techniques. The statistical Gamma test was
utilized to identify the most influential soil parameters on BD. The
applied models were assessed through k-fold testing where all the
available data patterns were involved in the both training and testing
stages, which provide an accurate assessment of the models accuracy.
Some existing pedotransfer functions were also applied and compared with
the heuristic models. The obtained results revealed that the heuristic
GEP model outperformed the other applied models globally and per test
stage. Nevertheless, the performance accuracy of the applied heuristic
models was much better than those of the applied pedotransfer functions.
Using k-fold testing provides a more-in-detail judgment of the models.
(C) 2017 Elsevier B.V. All rights reserved.
Filiaciones:
Shiri, Jalal:
Univ Tabriz, Water Engn Dept, Fac Agr, Tabriz, Iran
Keshavarzi, Ali:
Univ Tehran, Dept Soil Sci, Lab Remote Sensing & GIS, POB 4111, Karaj 3158777871, Iran
Kisi, Ozgur:
Int Black Sea Univ, Ctr Interdisciplinary Res, Tbilisi, Rep of Georgia
Int Black Sea Univ, Ctr Interdisciplinary Res, Tbilisi, Georgia
Karimi, Sepideh:
Univ Tabriz, Water Engn Dept, Fac Agr, Tabriz, Iran
Iturraran-Viveros, Ursula:
Univ Nacl Autonoma Mexico, Dept Matemat, Fac Ciencias, Circuito Escolar, Cd Univ, Mexico City 04510, DF, Mexico
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