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.

摘要普罗帕森：减少铁和腐殖质作为北极泥炭土壤中的主要呼吸过程。北极排水融化的湖泊盆地泥炭土壤中的厌氧呼吸。微生物生理在北极土壤中的碳通量中的作用具有气候变化的实质意义，PIS将采用新的方法来承诺新见解。这项研究将进一步理解对北极土壤碳通量的控制以及季节性和空间变化的理解。目标是：（1）确定阿拉斯加泥炭土壤中外细胞电子转移的特定机制，以及介导这些过程的微生物，（（2）量化北极液中北极液体溶液中的细胞细胞电子转移到土壤呼吸中的重要性的重要性沿土壤年龄梯度的腐殖质会影响外电子转移的速率及其发生的条件。