Relationship between Pedodiversity and Geomorphologic Patterns Using Modified Fractal Dimension (Case Study: East of Isfahan, Central Iran)

Based on the obvious relationship between geoforms and soils, pedodiversity was investigated in this study through the Spatial Distribution Patterns (SDPs) of LandForms (LFs) using quantitative analysis of the irregular geometry of LFs in Zayandeh-Rud Valley. The main objectives of this research were to: (۱) Assess the applicability of fractal and modified fractal dimensions in quantifying the irregular geometry of LFs in the study area and (۲) Specify the relationship between the irregular geometry of LFs and the pedodiversity in the region. LF units were delineated using aerial photographs at a scale of ۱:۵۵,۰۰۰; and the geoform classification system was defined according to Zinck. After fieldwork and soil sampling, Soil Taxonomy was used for soil classification at the family level and determination of the geomorphic map units. The fractal Dimension (D) and modified fractal Dimension (Dm), as geometric indicators, and richness (S), Shannon diversity index (H′), maximum diversity (H′max), and Evenness (E), as pedodiversity measures, were determined for LFs. Results showed that D and Dm were appropriate indicators of geometric irregularity, with their high values corresponding to fluvial surfaces with intensive dissection and deposition processes, and their low values corresponding to the smoother and more stable landforms. Comparison of the pedodiversity indices with the geometric measures in the landscapes showed that Dm was a suitable alternative to D in presenting structure of landscapes with high D and Dm values relatively coinciding with high amounts of richness in the study area. In addition, Dm was more closely related to the diversity indices than D was to the discernment of the pedodiversity of LFs.

کلیدواژه ها:

Geoforms ، Geometric irregularity ، Landforms ، Shannon diversity index. ، سطوح زمین ریختی ، آنالیز کمی ، تنوع پوشش خاکی ، بعد فرکتالی تغییر یافته