Toprak Termal Özellileri, Toprak Tekstürü ve Agregat Büyüklüğü Arasındaki Çoklu Etkileşimlerin Değerlendirilmesi

Öz

Toprakların termal özellikleri oldukça değişken olup, birçok faktör tarafından etkilenir. Ayrıca toprak termal özellikleri, toprak sıcaklığı ve sıcaklık rejimleri üzerinde de etkilidir. Toprağın termal özellikleri toprak su içeriği, toprağın yapısal bileşenleri ve agregasyon durumu tarafından önemli ölçüde etkilenir. Bu çalışmanın amacı, toprak tekstürüve agregat büyüklüğünün toprak ısısal özellikleri üzerindeki etkilerinin de Vries modeli ile değerlendirmektir. Bu çalışmada kaba, orta, ince tekstürlü ve farklı agregat büyüklüğüne (<4 mm, <2 mm ve <1 mm) sahip toprak örnekleri kullanılmıştır. Bu özelliklere sahip toprak örneklerinin, tarla kapasitesi koşullarında, termal iletkenlik, hacımsal ısı ve termal difüzivite gibi termal özellikleri hesaplanmıştır. Elde edilen sonuçlara göre, ısısal iletkenlik, hacımsal ısı ve ısısal yayınım açısından en yüksek değerler, toprak tekstürleri arasında, sırasıyla orta, ince ve kaba bünyeli topraklarda ortaya çıkmıştır. Termal iletkenlik ve termal difüzivite için en düşük değerler ise ince bünyeli toprakta tespit edilmiştir. Ayrıca, her bir toprak için en küçük agregatların (<1 mm) oluşturduğu örneklerde en düşük termal iletkenlik ve ısısal yayınım değerleri belirlenmiştir. Elde edilen sonuçlara göre, toprak tekstürü ve agregat büyüklüğünün toprağın ısısal özellikleri üzerinde önemli bir etkiye sahip olduğu belirlenmiştir. 

Anahtar Kelimeler

• Toprak tekstürü,termal özellikler,tarla kapasitesi,de Vries modeli

Assessment of Multiple Interactions between Soil Texture, Aggregate Size and Soil Thermal Properties

Abstract

Soil thermal properties are highly dynamics and is influenced by a multitude of factors. Soil thermal properties affect soil temperature and its thermal regime. Soil water content, soil contribution and state of aggregation affect significantly soil thermal properties. The aim of this study was to determine and evaluate the effects of soil texture and aggregate size on soil thermal properties using the de Vries model. Soil samples with different textures, separated into different aggregate size groups (<4 mm, <2 mm and <1 mm), were used. Thermal properties of soil samples including thermal conductivity, volumetric heat capacity and thermal diffusivity were estimated at field capacity. The results showed that the maximum values for the thermal conductivity, volumetric heat capacity, and thermal diffusivity occurred medium (MTS)>fine, (FTS)>coarse, (CTS) textured soils. In all textural groups thermal conductivity and thermal diffusivity were the smallest in aggregate size <1 mm. Results indicated that soil texture and aggregate size distribution have great effect on the soil thermal properties.

Keywords

• Soil textures,thermal properties,field capacity,de Vries model

Kaynakça

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