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

在土壤和沉积物中，局部生物地球化学过程与水、电子受体、酸、营养物质和污染物的分布之间存在很强的耦合。二者密切相关，从小到大都相互影响。天然土壤中的团聚体、根、层、大孔隙和润湿性差异等土壤结构增强了这些分布的斑块性。同时，这些重要参数的空间分布和时间动态难以获取。通过应用非破坏性测量，有可能克服这些限制。我们的无创荧光成像技术可以直接显示氧和ph的数量分布和变化。同样，通过光学成像也可以原位显示水的含量分布，但通过中子射线照相更精确。通过应用综合方法，我们将澄清由氧气消耗、pH变化和水分布诱导的界面的形成和结构。我们将绘制和建模微生物和植物根呼吸的影响，以限制氧气供应，由于局部高水饱和度，在自然和人工土壤。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，以及被困气相的氧气输送。

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.