泥炭沼泽中酚类物质对铁有机共聚物再循环的影响及意义

项目名称： 泥炭沼泽中酚类物质对铁有机共聚物再循环的影响及意义

项目编号： No.41472316

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 地质学

项目作者： 向武

作者单位： 中国地质大学（武汉）

项目金额： 88万元

中文摘要： 铁是地壳中含量最丰富的元素之一，也是海洋中限制性营养元素。海洋中的铁源主要来自陆地，其中具有全球意义的泥炭沼泽湿地不仅是是陆地生态系统向海洋输出铁的重要来源，也是研究陆地铁/碳循环耦合作用的关键场所之一。各类沉积物物中含有大量铁有机共聚物，是具有固碳固铁作用的重要锈汇。泥炭沼泽中高含量的酚类物质可以通过化学还原、络合促溶、电子穿梭以及抑菌作用等多方面影响铁有机共聚物的再循环。若尔盖是世界上最大的高原泥炭沼泽聚集地，哈尼湿地是我国泥炭积累最深的泥炭沼泽之一，两区铁源丰富，是开展酚铁相互作用对比研究的理想场所。以若尔盖和哈尼湿地为研究对象，通过野外调查和室内试验，系统研究不同泥炭沼泽中酚类物质对铁有机共聚物再循环的影响和机制，不仅有利于揭示铁有机共聚物固铁固碳的稳定性，还有助于评估泥炭沼泽源铁有机共聚物输出后的生态环境效应，为深入了解全球铁循环和碳循环的耦合作用提供科学依据。

中文关键词： 泥炭沼泽；酚类物质；铁有机共聚物；再循环；环境效应

英文摘要： Iron is one of the most abundant crustal elements , but also the limiting nutrient element in ocean. The iron in the ocean mainly originate from land. Peatland is not only an important source of iron export from terrestrial ecosystems to ocean, but a key place for studying iron/carbon coupling cycle. Sediments contain a large number of various types of Fe-OM coprecipitate. Which is an important rust sink for carbon and iron sequestration. In peatand, higher level phenolic compounds can affect the recycle of Fe-OM coprecipitate by chemical reduction , complexation dissolution , electron shuttle and the antibacterial effect of phenolics. Ruoergai is the world's largest gathering highland peatland, and Hani wetland is one of t pealand with he deepest peat accumulation. Both of the two peatlands are the ideal place to study phenol iron interactions. Through field investigation and laboratory tests, in Hani and Ruoergai wetlands, we hope to learn more about the effect of phenolics on Fe-OM coprecipitate recycle and the corresponding mechanism, which will conducive not only to reveal the Fe-OM coagulation sequestration stability, but also help to assess the environmental effects of Fe-OM coprecipitate. It will provide a scientific basis for understanding the global coupling of iron and carbon cycles.

英文关键词： peatland;phenolics;Fe-OMcoprecipitate;recycle;environmental effect