TUĞRUL YAKUPOĞLU, Ayfer Özge ŞİŞMAN, Mehmet KARAGÖKTAS, ÖMER FARUK DEMİR

Toprakların doygun koşullardaki hidrolik iletkenlik değerlerinin pedotransfer eşitlikler le tahminlenmesi

Üç fazlı ve gözenekli bir sistem olan toprakta suyun hareketinin bilinmesi S-matriksin karakteri hakkında önemli ipuçları vermektedir. Bu nedenle toprak fizikokimyasal özelliklerine dogrudan etki eden suyun toprakta iletiminin ölçümü son derece önemlidir. Laboratuarda Mariotte düzenegi ile doygun kosullarda yapılan kullanıssız hidrolik iletkenlik testleri arastırmacı için çogunlukla zaman alıcı ve usandırıcı olmaktadır. Bu çalısmanın amacı, bazı temel toprak fiziksel özellikleri ve nem sabiteleri kullanılarak olusturulan pedotransfer esitlikler (PTFs) yardımıyla toprakta doygun kosullardaki düsey hidrolik iletkenlik degerinin (Ks) tahminlenmesidir. Bu amaç dogrultusunda Kahramanmaras-Narlı Ovasından 25 adet yüzey toprak örnegi (0-15 cm) alınmıstır. Rutin toprak özellikleri, nem sabiteleri ve Ks bilinen yöntemlerle ölçülmüstür. Daha sonra veri kümesi istatistiksel olarak degerlendirilmis ve çoklu lineer regresyon yöntemi kullanılarak Ksyi tahminlemede kullanılacak PTFs olusturulmustur. Bilinen yöntemlerle ölçülen ve gelistirilen PTFs ile tahminlenen Ks degerlerinin karsılastırılmasında determinasyon katsayısı (R2) kullanılmıs ve en yüksek R2 degeri 0,846 olarak elde edilmistir. Bu arastırmanın sonuçları Kahramanmaras-Narlı Ovasında Ks degerlerinin tahmin edilmesinde gelistirilen pedotransfer modellerin kullanılabilecegini göstermektedir.

Predicting of saturated hydraulic conductivity values of soils with pedotransfer functions

Known of water movement into soil that a porous media with three-phase gives important clues about character of S-matrix. Water directly affects on soil physicochemical properties thus, measuring of water conductivity into soil is extremely important. Under laboratory conditions, cumbersome saturated hydraulic conductivity tests conducted by using Mariotte bottle which is usually time-consuming and tedious for researchers. The objective of this study was to predict of saturated vertical hydraulic conductivity values (Ks) of soils with pedotransfer functions (PTFs) generated by some basic soil physical properties and water constants. For this purpose, twenty-five surface soil samples (0-15 cm depth) were collected from Kahramanmaras-Narlı Plain. Routine soil properties, water constants and Ks were measured. Then, the data set was statistically evaluated and PTFs were generated by multiple linear regression method to estimate Ks. In order to compare the measured Ks values by traditional method and predicted Ks values with generated PTFs, determination coefficient (R2) was used, and the highest R2 was obtained as 0.846. The results of this research pointed out that generated pedotransfer models can be used with the aim of predicting Ks in Kahramanmaras-Narlı Plain.

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