Measuring in Rhizosphere
Study plant root microenvironment
An example of a study in sea grass-vegetated sediment in the Philippines is shown below (data from Pedersen O, Borum J, and Greve TM). In this study, the microsensors for pH, oxygen, and sulfide gas were mounted on an autonomous profiling unit (Unisense MiniProfiler MP4) and operated from a boat.
The microsensors detected an oxygen penetration of about 8 mm. Deeper down some oxygen peaks were recorded where the micro-sensor encountered a root of the macrophyte. This influenced the sulfide concentration because sulfide oxidation occurs in these microzones. Without the use of microsensors it would have been very difficult to show this phenomenon
Hupfer et al (2003) completed microprofiles of oxygen, pH or redox around the roots of P. Crispus and E. Caradensis. Roots were fixed in a setup with a supporting frame. Unisense microsensors were placed directly at the roots surface and covered with homogenized and flooded sediment. After an adaption time of min. 30 minutes, vertical microprofiles of oxygen, redox and pH were measured with a spatial resolution of 100 µm.