In situ surface shear strength as affected by soil characteristics and land use in calcareous soils of central Iran

摘要: Abstract Soil surface shear strength is an important input parameter in the process-based soil erosion models, but its direct measurement at watershed scale difficult, time-consuming and costly. This study was conducted to predict situ of using multiple-linear regression (MLR). The land use impact on examined as well. A box constructed measure (cohesion, c angle internal friction, φ) Semirom region located Isfahan province, central Iran. device consisted a circular (with 10 cm diameter height 1 cm), S-shaped load cell for measuring horizontal (shear) stress electric motor applying stress. normal acting failure adjusted by adding weights box. determined 100 locations under three systems grassland, irrigated farming dryland farming. particle size distribution (clay, silt, sand fine clay), organic matter content (OM), carbonate content, bulk density gravel were predictors strength. Normalized difference vegetation index (NDVI) also calculated satellite images. MLR employed (i.e. two groups variables: i) easily-available properties (pedotransfer functions, PTFs) ii) NDVI (soil spatial prediction SSPFs). strong negative correlation (r = − 0.72, p