A simulation model of organic matter and nutrient accumulation in mangrove wetland soils

摘要: The distribution and accumulation of organic matter, nitrogen (N) phosphorus (P) in mangrove soils at four sites along the Shark River estuary south Florida were investigated with empirical measures a process-based model. nutrient model (NUMAN) was developed from SEMIDEC marsh matter parameterized data wetlands. soil characteristics varied greatly both concentrations profiles carbon, N P. Organic decreased 82% upstream locations to 30% marine sites. Comparisons simulated observed results demonstrated that landscape gradients can be adequately modeled by accounting for plant production, litter decomposition export, allochthonous input mineral sediments. Model sensitivity analyses suggest root production has more significant effect on composition than fall. simulations showed greatest change N, P occurred surface 5 cm depth. rapid labile responsible this decrease matter. Simulated mineralization rates quickly depth, which corresponded increase content bulk density downstream compared those controlled mainly variation inputs mouth estuary, production. Research allochthonouns sediment situ mangroves is limited their significance understanding biogeochemistry these More accurate temporal patterns depth will depend including effects disturbance such as hurricanes redistribution biomass