The role of mobile organic matter and biocolloids for the properties of and interactions with biogeochemical interfaces in soil

移动有机物和生物胶体对土壤中生物地球化学界面的性质及其相互作用的作用

• 批准号: 41017844
• 负责人: Professor Dr. Kai Uwe Totsche
• 金额: --
• 依托单位: Lehrstuhl für Hydrogeologie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/41017844?language=en
• 关键词: role; mobile; organic; matter; biocolloids

Soil‘s function as filter and transformer of matter input is controlled by the interplay of physical, chemical and biological interactions at biogeochemical interfaces (BGIs). Properties of these BGIs at the local scale are decisive for interactions of dissolved and colloidal substances including biocolloids. Local scale processes (e.g. (de)sorption, pore-diffusion, adhesion of microorganisms, biodegradation) seem to govern the macroscopic phenomena of retardation and transformation at the continuum scale. The objectives of this proposal are thus to (I) explore the role of mobile organic matter including biocolloids for the properties of BGIs, to (II) quantify the proportion of the immobile void volume (PIVV), to (III) unravel the rates and processes of interactions of dissolved and colloidal compounds with BGIs and PIVV on the local, and to (IV) link it with the phenomena of retardation and transformation on the continuum scale in mechanistic ways. Organic and inorganic solutes with different molecular properties will serve as “process tracers” to probe PIVV as well as interactions with and properties of BGIs. The fundamental challenge will be to integrate the information obtained at different scales – nano-scale and molecular information by spectro-microscopy and computational chemistry, aggregate-scale information, and 3D-structural core scale information by tomography – into a general framework of flow, transport and transformation of organic chemicals on the pedon scale.

土壤作为物质输入的过滤器和Transformer的功能是由土壤地球化学界面上的物理、化学和生物相互作用控制的。这些BGI在局部尺度上的性质对溶解和胶体物质（包括生物胶体）的相互作用具有决定性作用。局部尺度的过程（如（脱）吸附，孔隙扩散，微生物的粘附，生物降解）似乎支配的宏观现象的阻滞和转化在连续尺度。因此，本提案的目的是（I）探索移动的有机物（包括生物胶体）对BGI性质的作用，（II）量化非移动的空隙体积（PIVV）的比例，（III）揭示溶解和胶体化合物与BGI和PIVV在局部的相互作用速率和过程，（IV）以机械的方式将其与连续统尺度上的阻滞和转化现象联系起来。具有不同分子性质的有机和无机溶质将作为“过程示踪剂”来探测PIVV以及与BGI的相互作用和BGI的性质。根本的挑战将是整合在不同的尺度上获得的信息-纳米尺度和分子信息的光谱显微镜和计算化学，聚合物规模的信息，和三维结构的核心规模的信息断层扫描-到一个一般框架的流动，运输和转换的有机化学品的土壤规模。