Highly-resolved imaging in artificial and natural soils to yield dynamics and structure of interfaces from oxygen, pH and water content

在人造和天然土壤中进行高分辨率成像，根据氧气、pH 值和含水量得出界面的动态和结构

• 批准号: 40915647
• 负责人: Professor Dr. Sascha E. Oswald
• 金额: --
• 依托单位: Arbeitsgruppe Wasser- und Stofftransport in Landschaften
• 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 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/40915647?language=en
• 关键词: Highly; resolved; imaging; artificial; natural

In soils and sediments there is a strong coupling between local biogeochemical processes and the distribution of water, electron acceptors, acids, nutrients and pollutants. Both sides are closely related and affect each other from small scale to larger scale. Soil structures such as aggregates, roots, layers, macropores and wettability differences occurring in natural soils enhance the patchiness of these distributions. At the same time the spatial distribution and temporal dynamics of these important parameters is difficult to access. By applying non-destructive measurements it is possible to overcome these limitations. Our non-invasive fluorescence imaging technique can directly quantity distribution and changes of oxygen and pH. Similarly, the water content distribution can be visualized in situ also by optical imaging, but more precisely by neutron radiography. By applying a combined approach we will clarify the formation and architecture of interfaces induces by oxygen consumption, pH changes and water distribution. We will map and model the effects of microbial and plant root respiration for restricted oxygen supply due to locally high water saturation, in natural as well as artificial soils. Further aspects will be biologically induced pH changes, influence on fate of chemicals, and oxygen delivery from trapped gas phase.

在土壤和沉积物中，局部土壤地球化学过程与水、电子受体、酸、营养物和污染物的分布之间存在着强烈的耦合。两者从小到大，都是密切相关、相互影响的。土壤结构，如团聚体，根，层，大孔隙和润湿性差异发生在自然土壤中增强这些分布的斑块。与此同时，这些重要参数的空间分布和时间动态很难获得。通过应用非破坏性测量，可以克服这些限制。我们的非侵入性荧光成像技术可以直接定量氧气和pH值的分布和变化。同样，水含量分布也可以通过光学成像原位可视化，但更精确的是通过中子射线照相术。通过应用综合方法，我们将阐明由耗氧量，pH值变化和水分布引起的界面的形成和结构。我们将绘制和模拟微生物和植物根系呼吸的影响，由于局部高水饱和度，在自然以及人工土壤中的氧气供应受限。进一步的方面将是生物诱导的pH值变化，对化学品命运的影响，以及从捕获的气相中输送氧气。