Modelling scenarios of soil properties and managements in olive groves at the micro-catchment scale with the AnnAGNPS model to quantify organic carbon

摘要

Soil organic carbon (SOC) stock changes are crucial in identifying risk of desertification in fragile areas In this work, 108 scenarios were prepared with the model AnnAGNPS in a small catchment of extensive olive groves by considering 6 different soil types (with textures sandy, S; sandy loam, Slo; loam, L; clay loam, Clo; silty loam clay, SiLoC; clay, C), 3 different managements (no till, NT; conventional tillage, CT, and cover crop, SC), 3 types of fertilization (two organic at rates of 40 and 80 kg.ha 1, F2 and F3, and another inorganic F1 with 100 kg.ha(-1)), and 2 contrasting reach organic carbon half-life time (0.1 day-730 days). The consistency of simulated annual OC attached to sediment and variations in ground SOC (h = 200 mm) were evaluated and compared in the context of the region of Andalusia, Spain. In addition, the most significant parameters to consider in the subsequent calibration process were also identified.