Evaluation and Development of Pedo-Transfer Functions for Predicting Soil Saturated Hydraulic Conductivity in the Alpine Frigid Hilly Region of Qinghai Province

In recent years, Pedo-Transfer Functions (PTFs) have become a commonly used tool to predict the hydraulic properties of soil. As an important index to evaluate the function of forest water conservation, the prediction of saturated hydraulic conductivity (<i>K<sub>S</sub></i>)...

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Main Authors: Yafan Zuo, Kangning He
Format: Article
Language:English
Published: MDPI AG 2021-08-01
Series:Agronomy
Subjects:
Online Access:https://www.mdpi.com/2073-4395/11/8/1581
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spelling doaj-8068d0a0a16f4532aacb95c97dc3b3be2021-08-26T13:25:54ZengMDPI AGAgronomy2073-43952021-08-01111581158110.3390/agronomy11081581Evaluation and Development of Pedo-Transfer Functions for Predicting Soil Saturated Hydraulic Conductivity in the Alpine Frigid Hilly Region of Qinghai ProvinceYafan Zuo0Kangning He1Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing Engineering Research Center of Soil and Water Conservation, Engineering Research Center of Forestry Ecological Engineering of Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, ChinaKey Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing Engineering Research Center of Soil and Water Conservation, Engineering Research Center of Forestry Ecological Engineering of Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, ChinaIn recent years, Pedo-Transfer Functions (PTFs) have become a commonly used tool to predict the hydraulic properties of soil. As an important index to evaluate the function of forest water conservation, the prediction of saturated hydraulic conductivity (<i>K<sub>S</sub></i>) on the regional scale is of great significance to guide the vegetation construction of returning farmland to forest area. However, if the published PTFs are directly applied to areas where the soil conditions are different from those where the PTFs are established, their predictive performance will be greatly reduced. In this study, 10 basic soil properties were measured as input variables for PTFs to predict <i>K<sub>S</sub></i> in the three watersheds of Taergou, Anmentan, and Yangjiazhai in the alpine frigid hilly region of Qinghai Province, China. The parameters of the eight published PTFs were modified by the least-squares method and new PTFs were also constructed, and their prediction performance was evaluated. The results showed that the <i>K<sub>S</sub></i> of coniferous and broad-leaved mixed forests and broad-leaved pure forests in the study area were significantly higher than those of pure coniferous forests, and grassland and farmland were the lowest (<i>p</i> > 0.05). Soil Organic Matter plays an important role in predicting <i>K<sub>S</sub></i> and should be used as an input variable when establishing PTFs. The Analysis-Back Propagation Artificial Neural Network (BP ANN) PTF that was established, with input variables that were, Si·SOM, BD·Si, ln<sup>2</sup>Cl, SOM<sup>2</sup>, and SOM·lnCl had a better predictive performance than published PTFs and MLR PTFs.https://www.mdpi.com/2073-4395/11/8/1581least-square methodMultiple Linear Regressionprincipal component analysisArtificial Neural Networks
collection DOAJ
language English
format Article
sources DOAJ
author Yafan Zuo
Kangning He
spellingShingle Yafan Zuo
Kangning He
Evaluation and Development of Pedo-Transfer Functions for Predicting Soil Saturated Hydraulic Conductivity in the Alpine Frigid Hilly Region of Qinghai Province
Agronomy
least-square method
Multiple Linear Regression
principal component analysis
Artificial Neural Networks
author_facet Yafan Zuo
Kangning He
author_sort Yafan Zuo
title Evaluation and Development of Pedo-Transfer Functions for Predicting Soil Saturated Hydraulic Conductivity in the Alpine Frigid Hilly Region of Qinghai Province
title_short Evaluation and Development of Pedo-Transfer Functions for Predicting Soil Saturated Hydraulic Conductivity in the Alpine Frigid Hilly Region of Qinghai Province
title_full Evaluation and Development of Pedo-Transfer Functions for Predicting Soil Saturated Hydraulic Conductivity in the Alpine Frigid Hilly Region of Qinghai Province
title_fullStr Evaluation and Development of Pedo-Transfer Functions for Predicting Soil Saturated Hydraulic Conductivity in the Alpine Frigid Hilly Region of Qinghai Province
title_full_unstemmed Evaluation and Development of Pedo-Transfer Functions for Predicting Soil Saturated Hydraulic Conductivity in the Alpine Frigid Hilly Region of Qinghai Province
title_sort evaluation and development of pedo-transfer functions for predicting soil saturated hydraulic conductivity in the alpine frigid hilly region of qinghai province
publisher MDPI AG
series Agronomy
issn 2073-4395
publishDate 2021-08-01
description In recent years, Pedo-Transfer Functions (PTFs) have become a commonly used tool to predict the hydraulic properties of soil. As an important index to evaluate the function of forest water conservation, the prediction of saturated hydraulic conductivity (<i>K<sub>S</sub></i>) on the regional scale is of great significance to guide the vegetation construction of returning farmland to forest area. However, if the published PTFs are directly applied to areas where the soil conditions are different from those where the PTFs are established, their predictive performance will be greatly reduced. In this study, 10 basic soil properties were measured as input variables for PTFs to predict <i>K<sub>S</sub></i> in the three watersheds of Taergou, Anmentan, and Yangjiazhai in the alpine frigid hilly region of Qinghai Province, China. The parameters of the eight published PTFs were modified by the least-squares method and new PTFs were also constructed, and their prediction performance was evaluated. The results showed that the <i>K<sub>S</sub></i> of coniferous and broad-leaved mixed forests and broad-leaved pure forests in the study area were significantly higher than those of pure coniferous forests, and grassland and farmland were the lowest (<i>p</i> > 0.05). Soil Organic Matter plays an important role in predicting <i>K<sub>S</sub></i> and should be used as an input variable when establishing PTFs. The Analysis-Back Propagation Artificial Neural Network (BP ANN) PTF that was established, with input variables that were, Si·SOM, BD·Si, ln<sup>2</sup>Cl, SOM<sup>2</sup>, and SOM·lnCl had a better predictive performance than published PTFs and MLR PTFs.
topic least-square method
Multiple Linear Regression
principal component analysis
Artificial Neural Networks
url https://www.mdpi.com/2073-4395/11/8/1581
work_keys_str_mv AT yafanzuo evaluationanddevelopmentofpedotransferfunctionsforpredictingsoilsaturatedhydraulicconductivityinthealpinefrigidhillyregionofqinghaiprovince
AT kangninghe evaluationanddevelopmentofpedotransferfunctionsforpredictingsoilsaturatedhydraulicconductivityinthealpinefrigidhillyregionofqinghaiprovince
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