Biogeochemical Processes Governing Production and Emission of Reduced Sulfur Gases along a Salinity Gradient in Gulf Coast Wetlands

控制墨西哥湾沿岸湿地盐度梯度上减少的硫气体的生产和排放的生物地球化学过程

• 批准号: 9107555
• 负责人: Ronald DeLaune
• 金额: $ 25万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-11-01 至 1996-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9107555&HistoricalAwards=false
• 关键词: Biogeochemical; Processes; Governing; Production; Emission

Drs. DeLaune, Patrick, and Lindau propose to conduct a field and laboratory study of gaseous sulfur production and emissions from Gulf Coast wetlands. Studies of sulfur gas emissions in coastal wetlands have not been extensive enough to establish the biogeochemical conditions and magnitude of sulfur gas production. The site of this study will be Barataria Basin, Louisiana. This basin encompasses one of the largest and most productive estuaries in the United States, with wetland types ranging from salt marsh to fresh marsh. This research will quantify the seasonal and diurnal gaseous fluxes to the atmosphere of H2S and organic sulfur compounds from the wetland types. Sulfur gases trapped in soils will be measured and related to the atmospheric emissions. The role of sediment redox conditions and organic carbon in the formation of gaseous sulfur forms in fresh, brackish, and salt marshes will also be studied using sediment redox controlled microcosms in the laboratory. Gaseous sulfur compounds produced from decomposition of added soil organic matter will be compared to compounds produced from bacterial sulfate reduction. The role of wetland vegetation in production of gaseous sulfur will also be investigated. Drs. DeLaune, Patrick and Lindau are leading researchers in the area of wetland biogeochemistry. The institutional facilities for this research are excellent.

DeLaune博士、帕特里克博士和林道博士建议进行实地考察， 气体硫的产生和排放的实验室研究 墨西哥湾沿岸湿地。 沿海含硫气体排放研究 湿地还没有广泛到足以建立 含硫气体生成的地球化学条件和规模。 本研究的地点为路易斯安那州巴拉塔里亚盆地。 这 这个盆地包含了世界上最大和最多产的河口之一 在美国，湿地类型从盐沼到 新鲜的沼泽。 这项研究将量化季节性和 H2S和有机硫的日气体通量 湿地类型的化合物。 土壤中的含硫气体 将被测量并与大气排放量相关。 的 沉积物氧化还原条件和有机碳在 气态硫在新鲜、半咸和盐中形成 还将利用沉积物氧化还原控制技术研究沼泽 实验室里的微观世界 产生的气态硫化物 添加土壤有机质的分解将进行比较 涉及由细菌硫酸盐还原产生的化合物。 的作用 湿地植被在生产气态硫中的作用也将被 研究了 德劳恩博士，帕特里克和林道博士 湿地生态地球化学领域的研究人员。 的 进行这项研究的机构设施非常好。