Investigation of some Soil Physico-Chemical along with Micromorphological Properties with Calcareous and Gypsiferous Parent Materials in Different Landscaping Units (Case study: Lorestan province, Alashtar)

Subject Areas : Farm water management with the aim of improving irrigation management indicators

kolsoum rahmansalari ¹ , Mohamad Amir Delavar ² , Mehrdad Esfandiari ³ , ebrahim pazira ⁴

1 - PhD Student, Soil Genesis and Classification, Faculty of Agriculture and Natural Resources, Science and Research Branch, Islamic Azad University, Tehran, Iran.
2 - Associate Professor, Department of Soil Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran.
3 - Professor, Department of Soil Science, Faculty of Agriculture and Natural Resources, Science and Research Branch, Islamic Azad University, Tehran, Iran.
4 - Professor, Department of Soil Science, Faculty of Agriculture and Natural Resources, Science and Research Branch, Islamic Azad University, Tehran, Iran.

Received: 2021-06-14 Accepted : 2021-10-25 Published : 2022-06-22

Keywords: Gypsum and calcareous soils, Physiographic Units, Pedogenic Effects, Micromorphology,

Abstract :

Background and Objectives: The optimum and sustainable use of soil is only possible with a correct and complete understanding of its properties. This study was conducted to investigate of should be omitted some physical, chemical, and micromorphology properties of soil formed on the should be added landscapes in the should be added semi-arid region of Lorestan province.Materials and Methods: For this study 5 profiles, a long, a should be omitted transect in the direction of slop (plateau, gravelly colluvial fan and pediment plain) were identified in the area, and divided into different physiographic unit based on the type of parent material. At each, physiographic units a profil was excavated, dissected sampled. Physicochemical together with micromorphological observations performed and Soil Taxonomy and WRB were used for soil classification.Results: The results showed that should be omitted low amounts of organic carbon in the surface and depths of the soil due to the high rate of decomposition of these substances in these areas. The equivalent calcium carbonate in all profiles showed an increasing trend with depth. Thin section investigation showed that there was not much difference between the horizons in terms of the type of voids and the relative distribution of large particles (C/F). Planar, vugh and cannel voids were the most dominant voids of the profiles. Accumulation of calcite was seen in various forms such as coating, infilling, needle- shaped calcite, and nodules calcite which indicates that secondary calcite, and caused a should be omitted crystallite calcite of kind b-fabric. Soil structure in most the horizons of kind angular blocky and sub angular blocky. Also, lenticular plates gypsum was observed on the Bky horizon on the of the gypsum physiographic units plateau. According According to the existence of pedogenic gypsum in the soils of the region, and the important of the gypsum horizon in the soil classification system and its important effect on plant growth. New great groups, and subgroups of Xerepts (Gypsic Calcixerepts) are suggested to be included in soil taxonomy.Conclusion: Results of the study showed raise in topography and parent material on the variability of soil properties in the area.

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