Evaluation of Pedotransfer Functions (PTFs) for Some Soil Physical Properties

Year 2019, Volume: 1 Issue: 1, 28 - 34, 31.12.2019

Pelin Alaboz , Ahmet Ali Işıldar

Abstract

In recent years, studies
on the estimation of another soil property using data on some soil properties
(Pedotransfer Functions, PTFs), are widely used. In this context, increased
interest in pedotransfer functions (PTFs) has been observed. In this study, the
pedotransfer functions created for some soil physical properties (hydraulic
properties, bulk density, penetration resistance, and aggregate stability) were
investigated. Textural fractions (% sand, silt, and clay) and organic matter
were determined as commonly used soil properties in the estimation models. In
addition, the inclusion of the bulk density increased the accuracy of
estimation in models of hydraulic conductivity and penetration resistance.
Previous research had determined that a high coefficient of determination (R2)
and low root means square error (RMSE) were used as important indicators
in assessing the usability of the estimation models obtained. The estimated accuracy level of the models can be affected by parameters such as soil properties, the climate of the region, methods of analysis, homogeneity of data.

Keywords

Pedotransfer Functions, Moisture Constants, Hydraulic Conductivity, Bulk Density, Aggregate Stability, Penetration Resistance

Pedotransfer Fonksiyonların (PTFs) Bazı Toprak Fiziksel Özellikleri için Değerlendirilmesi

Abstract

Son yıllarda, bazı toprak özelliklerine ilişkin veriler kullanılarak bir başka toprak özelliğinin tahmin edilmesine yönelik çalışmaların sıklaştığı ve bu kapsamda pedotransfer fonksiyonlara (PTFs) olan ilginin arttığı gözlenmektedir. Bu çalışmada, bazı toprak fiziksel özellikleri (hidrolik özellikler, hacim ağırlığı, penetrasyon direnci ve agregat stabilitesi) için oluşturulan pedotransfer fonksiyonlar değerlendirilmiştir. Söz konusu tahmin modellerinde, tekstürel fraksiyonlar (% kum, silt ve kil) ve organik madde ortak olarak kullanılan toprak özellikleri olarak belirlenmiştir. Ayrıca hidrolik iletkenlik ve penetrasyon direnci tahminlerinde, hacim ağırlığının modellere dahil edilmesinin doğruluk düzeyini arttırdığı gözlenmiştir. Geçmişte yürütülen araştırmalar; elde edilen tahmin modellerinin kullanılabilirliğinin değerlendirilmesinde, yüksek belirleme katsayısı (R2) ve düşük hata kareler ortalaması karekökünü (RMSE) önemli göstergeler olarak bildirmektedir. Modellerin tahmin doğruluk düzeyi; toprak özellikleri, bölgenin iklimi, analiz yöntemleri, verilerin homojenliği gibi parametrelerden etkilenebilmektedir.

Keywords

Pedotransfer fonksiyonlar, nem sabiteleri, hidrolik iletkenlik, hacim ağırlığı, agregat stabilitesi, penetrasyon direnci

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