Organic matter and trace gas turnover in northeast Siberian permafrost: First soil studies on the impact of climate change on carbon mineralization

拟议的研究项目的目的是提高我们的有机质周转的碳丰富的东北西伯利亚永久冻土及其对全球变化的潜在响应的理解。永久冻土（永久冻土）是北方大约四分之一地区的地貌特征。在西伯利亚东北部，永久冻土层含有大量的有机物质。目前观察到的全球温度上升导致更深的永久冻土融化，使以前冻结的有机物暴露于微生物降解。目前对深层冻土有机质碳矿化率的估计是高度不确定的，北方冻土景观的痕量气体排放测量是稀缺的。现场和实验室实验计划量化的碳矿化和微量气体周转在东北西伯利亚永久冻土的不同深度，年龄和成分。将使用不同的培养方法和基于稳定同位素的技术在好氧和缺氧条件下对矿化率进行量化。研究结果将增加我们对冻土退化对痕量气体通量影响的认识。

The objective of the proposed research project is to improve our understanding of organic matter turnover in the carbon rich northeast Siberian permafrost soils and its potential response to global change. Permanently frozen ground (permafrost) characterises the landscape of about one quarter of the northern hemisphere. In northeast Siberia, permafrost deposits contain huge amounts of organic matter. The currently observed global temperature rise results in deeper permafrost thawing exposing formerly frozen organic matter to microbial degradation. Current estimates about carbon mineralization rates of deep permafrost organic matter are highly uncertain and trace gas emissions measurements from northern permafrost landscapes are scarce. Field and laboratory experiments are planned to quantify carbon mineralization and trace gas turnover in northeast Siberian permafrost of different depth, age, and composition. Mineralization rates will be quantified under oxic and anoxic conditions using different incubation methods and stable isotope based techniques. The results will increase our knowledge about the impact of permafrost degradation on trace gas fluxes.