Fırat ATALAY, Tülay TUNÇAY, İlhami ÜNVER, İlhami BAYRAMİN

Ağırlıklı Ters Uzaklık İnterpolasyon Yöntemiyle Çukurova'da Kimi Toprak Karakteristiklerinin Konumsal Dağılımının Tahmini

Bu çalışmada Çukurova Aşağı Seyhan Nehir Havzasındaki kimi toprak karakteristiklerinin konumsal dağılımının belirlenmesi için interpolasyon yöntemi kullanılmıştır. Bu toprak karakteristikleri tarımsal arazi yönetimini geliştirmede katkı sağlamaktadır. Çalışma alanında 150 m uzunluğa sahip, 5 m aralık ile 7 paralel transect seçilerek ve 104 adet toprak örneği alınmış ve bu örneklerde kalsiyum karbonat, organik madde, katyon değişim kapasitesi ve kil (tane büyüklüğü1. Introductiondağılımından) belirlemesi yapılmıştır. Sonuçlara ağırlıklı ters uzaklık interpolasyon yöntemi (ATU) ve CBS teknolojisi uygulanmıştır. ATU interpolasyon yönteminden elde edilen kalsiyum karbonat, organik madde, katyon değişim kapasitesi ve kil değerleri ile toprak analiz sonuçları benzerlik göstermiştir. İnterpolasyon tekniğinin doğruluğunu belirlemek için çapraz doğrulama yapılmıştır. Organik madde değerlerinin 30-60 cm derinliğindeki interpolasyonu, en yüksek ortalama değişim değeri (% 2.82) göstermiş, diğer parametrelerde bu durum gözlenmemiştir.

Assessment of Inverse Distance Weighting (IDW) Interpolation on Spatial Variability of Selected Soil Properties in the Cukurova Plain

This study attempts to evaluate interpolation technique for mapping spatial distribution of some soil characteristics at the Lower Seyhan River Basin in Cukurova (Turkey). These soil characteristics may help to improve agricultural land management practices. In the study area, 7 parallel transects each having 150 m of length were selected at 5 m intervals, and 104 soil samples were collected. In these samples, calcium carbonate, organic matter, cation exchange capacity and clay content (from particle size distribution) were determined. Inverse distance weighting (IDW) interpolation and employing of GIS technology were applied on the results. Calcium carbonate, organic matter, cation exchange capacity and clay content values derived from IDW interpolation were consistent with the results of the soil analysis. The verity of the interpolation technique was tested by employing cross validation. Interpolation of organic matter values showed a high mean error in 30-60 cm depth (2.82%) while this high deviation was not the case with the other parameters studied.

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