Document Type : پژوهشی
Authors
1 Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
2 Department of Physical Geography, Faculty of Earth Sciences, Shahid Beheshti University
3 epartment of Physical Geography Faculty of Earth Sciences Shahid Beheshti University (SBU)
Abstract
Dolines are one of the most important karst landforms and play an important role in soil formation. In this study, the morphometry of dolines and their relationship with the physicochemical characteristics of soil in Noakoh anticline were evaluated. Chemical and physical characteristics of 36 soil samples of dolines were collected and measured in the laboratory. Also, digital elevation model (DEM; 13 cm cell size) obtaining from UAV images, was used to measure the morphometric parameters of dolines. The results showed that large dolines have higher slope, depth and roundness, as well as sandy soils, and higher EC, pH, potassium, phosphorus, water holding capacity and soil organic carbon. Also, low- elevation dolines have large area, slope, depth, roundness and clay soils, and higher EC, PH, potassium, water holding capacity, organic carbon, and saturation percentage than high elevation dolines. The dolines located in the plunge of the anticline have large area, slope, depth, roundness and clay soils, as well as more EC, PH, potassium, water holding capacity, organic carbon and saturation percentage than the dolines in the central part. The mean of the most morphometric parameters and physicochemical characteristics of the soil in high-slope dolines is higher than in low-slope dolines. Therefore, the morphometric and pedological differences of dolines show that their formation and evolution are more at lower altitudes, plunge and steep slopes. In general, vegetation, elevation, slope and type of precipitation play an important role in morphometric differences and soils in dolines.
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