Inter-rill sediment yield and erodibility in parts of Esfahan Segzi-Kuhpayeh rangelands using rainfall simulator

In order to investigate rangelands erodibility erodibility and sediment yield, a part of Segzi-Kuhpayeh subcatchment located in Zayandeh-Roud Drainage Basin was chosen. In this land use unit, field rainfall simulator for production of runoff and sediment and measuring sediment yield was used. Erodibility was estimated using K-factor in USLE model. For investigating effective factors in sediment production and erodibility, soils were sampled adjacent to each rainfall simulator plot and some of physical and chemical parameters of soils were measured and analyzed. According to the results, erodibility was relatively low in these lands (mean K value is 0.23 t.h/ MJ.mm) which can be related to coarse grained texture of the soils. According to the results of regression models and correlation coefficients, silt, very fine sand, silt+very fine sand, moisture and calcium carbonate parameters have the highest effect on sediment production and erodibility.