Mineralization rates of peat from eroding peat islands in reservoirs

摘要: Reservoirs are sources of greenhouses gases to the atmosphere, primarily due organic carbon mineralization in flooded plants and soils dioxide (CO2) methane (CH4). Floating peat islands common reservoirs that inundated peatlands. These can decompose on mass, or small pieces erode from water column bottom reservoirs. Here we used large 450 liter sealed enclosures measure rates larger blocks collected floating islands. Mineralization were calculated by quantifying dissolved inorganic (DIC), CO2 CH4 accumulation within headspace over time. We found did under water, but not different than blocks. ranged between 59 l40 μg C g−1 d−1. Peat acidified shifting bicarbonate equilibrium almost exclusively CO2, which was then readily able flux atmosphere. estimated 2.4–5.6% mineralized annually, suggesting fluxes flood peatlands could last at minimum 18–42 years this source alone.