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Journal of Mountain Science

, Volume 6, Issue 2, pp 162–172 | Cite as

Micromorphological evidences of climatic change in Yazd region, Iran

  • Ruhollah Taghizadeh MehrjardiEmail author
  • Shahla Mahmoodi
  • Ahmad Heidari
  • Ali Akbarzadeh
Article

Abstract

The fact of, present is the key of the past, will help us to use paleosols properties as indicators of the ecological characteristics of past time, particularly the paleoclimate. In this respect the micromorphological properties showed to be a very good indicator. Therefore, for investigating of climate change in Ardakan-Yazd plain, Central Iran 9 pedons were digged and described. Yazd has an arid climate with less than 100 mm annual precipitation and more than 22°C mean annual temperature (Aridic-hyper thermic soil moisture and temperature regions, respectively). Based on the morphological and physicochemical analysis Arglic, Calcic and Gypsic diagnostic horizons have been distinguished in these soils. Thin section studied showed that the illuviated form of clay includes, infillings on channel, coating on pendant, on nodules and on grains, at lower depths and also juxtaposed calcite needles on void argillan at upper part of the profiles. Mineralogical result showed fine clay in arglic horizon, too. Considering depth and forms of these pedofeatures, we concluded that, the observed illuviated clays at lower depth must be the result of the more humid climate of the past, where the carbonates have been removed completely as pendant, nodules or coating to considerable depth, following processes, clay has been dispersed and also trans located to these depths. In contrast to these features, the juxtaposed needle calcite at the shallower depth is probably the result of drier climate of today.

Keywords

Micromorphological indicators climate change Arglic horizon Yazd region 

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH 2009

Authors and Affiliations

  • Ruhollah Taghizadeh Mehrjardi
    • 1
    Email author
  • Shahla Mahmoodi
    • 1
  • Ahmad Heidari
    • 1
  • Ali Akbarzadeh
    • 1
  1. 1.Department of Soil Science, University College of Agriculture & Natural ResourcesUniversity of TehranTehranIran

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