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

建议：还原铁和腐殖质是北极泥炭土壤中主要的呼吸过程P.I.：David Lipson圣地亚哥州立大学Lars T.Angenent Washington University西奥多·K·拉布斯坦福大学#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将合作研究铁和腐殖质在北极解冻后的湖盆泥炭土壤中作为电子受体在厌氧呼吸中的作用。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将应用有望获得新见解的新方法。这项研究将进一步加深我们对北极土壤碳通量的控制以及季节和空间变化的理解。其目标是：(1)确定阿拉斯加泥炭土壤中细胞外电子转移的具体机制，以及调节这些过程的微生物；(2)量化细胞外电子转移对北极融化湖盆土壤呼吸的重要性；(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)确定土壤腐殖质沿土壤年龄梯度的年龄和复杂性如何影响细胞外电子转移速率，以及它发生的条件。

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.