Short communication. The effect of freeze-thaw cycles on soil aggregate stability in different salinity and sodicity conditions


Sahin U., Anapali O.

SPANISH JOURNAL OF AGRICULTURAL RESEARCH, cilt.5, sa.3, ss.431-434, 2007 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 5 Sayı: 3
  • Basım Tarihi: 2007
  • Doi Numarası: 10.5424/sjar/2007053-267
  • Dergi Adı: SPANISH JOURNAL OF AGRICULTURAL RESEARCH
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.431-434
  • Anahtar Kelimeler: saline-sodic soils, soil properties, soil structure, HYDRAULIC CONDUCTIVITY, SODIUM
  • Atatürk Üniversitesi Adresli: Evet

Özet

Freezing and thawing affect soil aggregate stability. Understanding the effects of freezing and thawing processes on aaaregate stability is necessary for the development of strategies for managing saline-sodic soils. This study was performed to determine the effects of freezing and thawing cycles (two, four, and six) on wet aggregate stability ill six soils of different salinity and sodicity (54 dS m(-1), 11.7%; 49 dS m(-1), 11.8%; 53 dS m-1, 31.7%; 85 dS m(-1), 39.7%; 59 dS m(-1), 13.9%; 68 dS m(-1), 36.8%, respectively) and three different aggregate sizes (< 1, 1-2, and 2-4 mm). The experiments were conducted under laboratory conditions using disturbed and non-cropped soil samples. In soils with a high percentage of exchangeable sodium and high electrical conductivity, the effect of freeze-thaw cycles on the wet aaureuate stability was not significant. However, when the electrical conductivity was high and the percentage exchanaeable sodium relatively low, wet aggregate stability was significantly reduced by the freeze-thaw cycles. Moreover, for aggregate sizes of 1-2 and 2-4 rum, a significant reduction (P < 0.0 1) was seen in the wet aggregate stability of samples that underwent six freeze-thaw cycles compared to those that underwent two cycles.