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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.

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Sensors and electrodes

Frederiksen, Morten S. et al (2006), Oxygen dynamics in the rhizosphere of Zostera marina: A two-dimensional planar optode study, Limnology and Oceanography, 1072 - 1083, vol. 51 Read abstract

Hupfer, Michael et al (2003), Immobilisation of phosphorus by iron-coated roots of submerged macrophytes, Hydrobiologia, 635 - 640, vol. 506-509 Read abstract

Revsbech, N. P. et al (1999), Microsensor analysis of oxygen and pH in the rice rhizosphere under field and laboratory conditions, Biology and Fertility of Soils, 379 - 385, vol. 29 Read abstract

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