Reduction of iron and humic substances as a dominant respiratory process in arctic peat soils

铁和腐殖质的减少是北极泥炭土中主要的呼吸过程

• 批准号: 0808604
• 负责人: David Lipson
• 金额: $ 58.6万
• 依托单位: San Diego State University Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0808604&HistoricalAwards=false
• 关键词: Reduction; iron; humic; substances; dominant

AbstractProposal: Reduction of iron and humic substances as a dominant respiratory process in arctic peat soilsP.I.:David Lipson San Diego State UniversityLars T. Angenent Washington UniversityTheodore K. RaabStanford UniversityProposal # 0808604 Investigators from San Diego State University, Washington University, and Stanford University will collaborate to study the role of iron and humic substances as electron acceptors in anaerobic respiration in peat soils of drained thaw lake basins in the Arctic. The role of microbial physiology in carbon flux from Arctic soils has substantial implications of climate change, and the PIs will apply novel methods that promise new insights. The study will further our understanding of controls over and seasonal and spatial variability in of carbon fluxes from Arctic soils. The goals are to: (1) determine the specific mechanisms of exocellular electron transfer in Alaskan peat soils, and the microorganisms that mediate these processes, (2) quantify the importance of exocellular electron transfer to soil respiration in Arctic drained thaw lake basins, (3) determine the effects of polygon-induced microtopography on exocellular electron transfer, and (4) determine how age and complexity of soil humic materials along a soil age gradient affect rates of exo-electron transfer, and the conditions under which it occurs.

摘要提案：减少铁和腐殖质作为北极泥炭土壤中的主要呼吸过程主要负责人：David Lipson 圣地亚哥州立大学Lars T. Angenent 华盛顿大学Theodore K. Raab 斯坦福大学提案# 0808604 来自圣地亚哥州立大学、华盛顿大学和斯坦福大学的研究人员大学将合作研究铁和腐殖质作为电子受体在排水泥炭土厌氧呼吸中的作用北极湖盆融化。微生物生理学在北极土壤碳通量中的作用对气候变化具有重大影响，PI 将应用有望带来新见解的新方法。该研究将进一步了解北极土壤碳通量的控制以及季节和空间变化。目标是：（1）确定阿拉斯加泥炭土中细胞外电子转移的具体机制，以及介导这些过程的微生物，（2）量化细胞外电子转移对北极排水融湖盆地土壤呼吸的重要性，（ 3）确定多边形诱导的微地形对细胞外电子转移的影响，以及（4）确定土壤腐殖质材料的年龄和复杂性沿着土壤年龄梯度如何影响外电子的速率转移及其发生的条件。