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

Yıl 2018, , 157 - 162, 12.07.2018

Leila Imanparast , Mustafa Yıldırım Canbolat

https://doi.org/10.17097/ataunizfd.335531

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

Öz

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.

Anahtar Kelimeler

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

Kaynakça

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