Abstract
The performance of a micro soil solution sampling device was tested in a laboratory examination and in a field experiment. The instrument allows detection of temporal and spatial changes in soil solution chemistry at a spatially high resolution. The flexible tube of the suction cell is made of a porous polymer with a diameter of 2.3 mm. To achieve more stability and to minimize disturbance of the instrument during field installation, the original device was modified by embedding the suction cell in a stainless steel and pressure absorbing corpus. During a laboratory test the new sampling system was compared to ceramic P-80 suction cells. Solution samples taken with the new device adapted more quickly to the given concentrations compared to the ceramic suction cells. In a field test, micro samplers were implanted in an existing soil solution monitoring plot, equipped with standard ceramic samplers. Bi-weekly sampling using the micro cells indicated high temporal and spatial variation, and in June 1995 it was possible, to identify a distinct nitrification. However, in a statistical comparison of the entire sampling period and respective sub-sampling areas the two sampler types indicated identical concentration ranges for nitrate. It is concluded that the new micro samplers can help to identify processes in soils which may cause short-term changes in the soil solution chemistry, whereas the standard sampling technique with ceramic cells seems to be still a suitable tool if long-term mean soil solution concentrations are to be measured.
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Spangenberg, A., Cecchini, G. & Lamersdorf, N. Analysing the performance of a micro soil solution sampling device in a laboratory examination and a field experiment. Plant and Soil 196, 59–70 (1997). https://doi.org/10.1023/A:1004213006295
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DOI: https://doi.org/10.1023/A:1004213006295