Greenhouse Gas Production From Woody Swamp and Saline Marsh Soils Under Different Electron Accepters.

Dynamics of Carbon (C) gas emission from wetlands influence global C cycling. In many wetland systems contents of NO₃^- and SO₄^2- have increased due to nutrient loading and saltwater intrusion.  This could affect C mineralization and the emission of the major greenhouse gases carbon dioxide (CO₂) and methane (CH₄). In this investigation, a laboratory microcosm study was carried out to elucidate the effects of NO₃^- and SO₄^2- on CO₂, CH₄ and N₂Oproduction from a woody swamp and saline marsh soils located in the Barataria Basin of Louisiana coast, which have been subjected to the Mississippi River diversion and seawater intrusion. Composite soil samples were collected from top 50 cm marsh profile, treated with different levels of NO₃^- or SO₄^2- concentrations, and incubated under anaerobic conditions. The poster will discuss how the added electron acceptors impacted greenhouse gas emissions from these soils