تخمين نقطه اي منحني مشخصه آب خاك با استفاده از سطح ويژه و ميانگين هندسي قطر ذرات خاك (گزارش كوتاه علمي)

Point estimation of soil moisture characteristic curve based on soil specific surface area and mean geometric soil diameter

Measurement of soil moisture characteristic (SMC) curve is costly and time consuming. Point pedotransfer functions is one of the simple methods for estimating SMC curve. In this study, 20 soils were gathered from Marvdasht and Fasa regions in Fars province. Then, the SMC curve at suctions of 0, 3, 6, 9, 12, 30, 100, 500, 1000 and 1500 kPa, soil texture and soil specific surface area (SSA) of each soil were measured, and the mean geometric soil diameter (dg) of each soil was calculated. Then, regression equations were established for soil moisture content at mentioned suctions based on SSA and dg, separately. The results indicated that the point pedotransfer functions for suctions of 0-1500 kPa are appropriate.