TY - GEN A1 - Tougma, Inès Astrid A1 - Van de Broek, Marijn A1 - Six, Johan A1 - Gaiser, Thomas A1 - Holz, Maire A1 - Zentgraf, Isabel A1 - Webber, Heidi T1 - AMPSOM: A measureable pool soil organic carbon and nitrogen model for arable cropping systems T2 - Environmental Modelling & Software N2 - Most cropping system models simulate conceptual soil organic matter (SOM) pools, such as active, passive and slow pools that cannot be measured, complicating model calibration. In reality, SOM can be described in terms of quantifiable pools of particulate organic matter (POM) and mineral-associated organic matter (MAOM) which respond differently to management and climate. We present the AMPSOM model, integrated in a cropping system modelling framework (SIMPLACE). AMPSOM simulates carbon and nitrogen dynamics in MAOM and POM in response to crop growth and management, as well as soil texture, water and nitrogen content and temperature. It also simulates the radiocarbon isotope (14C) of soil organic carbon (SOC) to constrain the turnover time of slowly cycling SOC pools. Model calibration and evaluation were performed for thirty six sandy and loamy arable soils in Brandenburg, Germany. Results show that AMPSOM can reproduce observed patterns of SOC and nitrogen stocks in POM and MAOM along depth profiles across different soil types. KW - Modelling KW - Soil organic matter KW - Measurable pools KW - Particulate organic matter KW - Mineral-associated organic matter KW - Radiocarbon isotope Y1 - 2025 U6 - https://doi.org/10.1016/j.envsoft.2024.106291 SN - 1364-8152 VL - 185 PB - Elsevier BV ER -