Sensitivity analysis and calibration of CN-SIM to simulate the mineralisation of liquid dairy manures

摘要: Abstract Scientific knowledge of carbon and nitrogen dynamics incorporated into soil organic matter (SOM) dynamic simulation models can be tested using experimental data from decomposition experiments. This possibility is particularly interesting for liquid animal manures, which are very heterogeneous materials. CN-SIM a SOM model that was successfully applied the short- long-term C N in soil. The objective this research to test results 180-d laboratory incubation five dairy manures three soils. Initial sensitivity analysis indicated parameters mostly impact net CO2 mineral concentration (SMN) those allocate manure pools, their constants describe microbial biomass its residues. Automatic parameter optimisation carried out with downhill simplex method separately 15 by combinations. After optimisation, respiration well simulated entire period, while SMN overestimated after day 40. Simulations remineralisation immobilised first weeks. Simulated initial immobilisation only match decrease SMN, 40 necessary enable good respired CO2. Further work needed whether these simulations improved adding sinks (such as denitrified clay-fixed ammonium).