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Biogeochemical reactivity of Fe-organic matter coprecipitates

铁-有机物共沉淀物的生物地球化学反应性

基本信息

批准号：
168065308
负责人：
Professor Dr. Robert Mikutta
金额：
--
依托单位：
Professur für Bodenkunde und Bodenschutz
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/168065308?language=en
关键词：
Biogeochemical reactivity Fe organic matter

项目摘要

Iron(III) (hydr)oxide-organic associations in soils have been recognized to play an important role in the biogeochemical cycling of iron, carbon, and of nutrients like phosphate. In temporarily moist or water-logged soils such associations can form via the coprecipitation of dissolved organic matter (OM) with Fe(III) (hydr)oxides (FHOs). At present, it is generally unknown which factors control the formation and composition of Fe(III)-OM coprecipitates and how the structural properties translate into the cycling of the FHO and OM component involved. The objectives of the project are thus to elucidate (i) the structural properties of Fe(III)- OM coprecipitates under different environmental conditions, (ii) the subsequent stability of Fe(III)-OM coprecipitates against dissolution under both oxic as well as anoxic conditions, (iii) the changes in Fe(III)-OM coprecipitate composition upon redox oscillations, and (iii) their cumulative effects on oxyanion sorption. To achieve these goals, various batch experiments will be conducted. By using multiple analytical tools, this project will gain a fundamental understanding of the abiotic and biotic controls on the formation, structure, and biogeochemical reactivity of Fe(III)-OM coprecipitates in acidic and neutral temporarily moist soils and soils subject to redox oscillations.

土壤中的氧化铁-有机物结合体在铁、碳和磷等养分的生态地球化学循环中起着重要作用。在暂时潮湿或积水的土壤中，这种协会可以通过溶解的有机质（OM）与Fe（III）（氢）氧化物（FHO）的共沉淀形成。目前，它通常是未知的因素控制的Fe（III）-OM共沉淀物的形成和组成，以及如何将结构特性转化为循环的FHO和OM组件参与。因此，该项目的目标是阐明（一）在不同的环境条件下的Fe（III）- OM共沉淀物的结构特性，（二）随后的稳定性的Fe（III）-OM共沉淀物对溶解在两个好氧以及缺氧条件下，（iii）的变化，在Fe（III）-OM共沉淀物组成氧化还原振荡，和（iii）其累积效应对含氧阴离子吸附。为了实现这些目标，将进行各种批量实验。通过使用多种分析工具，该项目将获得对酸性和中性暂时潮湿土壤和氧化还原振荡土壤中Fe（III）-OM共沉淀物的形成，结构和生物地球化学反应性的非生物和生物控制的基本了解。