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In Situ Soil Water Extraction: A Review

^a Agrosphere Inst., ICG-4, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
^b Inst. of Soil Science, Berlin Univ. of Technology, Salzufer 12, 10587 Berlin, Germany
^c Inst. of Soil Sciences, University Hannover, Herrenhäuser Straße 2, 30419 Hannover, Germany
^d current address, HortResearch, Tennent Drive, Palmerston North, New Zealand
^e Thüringer Landesanstalt für Landwirtschaft, Naumburger Strasse 98, 07743 Jena, Germany
^f The Helmholtz Centre for Environmental Research– UFZ, Department of Soil Physics, Lysimeter Branch, Dorfstrasse 55, 39615 Falkenberg, Germany
^g Fachgebiet Waldernährung und Wasserhaushalt, Technische Universität München, Am Hochanger 13, 85354 Freising, Germany

View larger version (13K): [in this window] [in a new window]   Fig. 1. Horizontal installation of a suction cup from a trench (a), installation of a shaftless suction cup (b), installation in 45° angle (c), and vertical installation with collar (d). (e) installed collar, (f) refilled soil, and (g) undisturbed soil.

View larger version (8K): [in this window] [in a new window]   Fig. 2. Schematical scetch of a suction plate with porous body (a), frame (b), and tube connection (c) (after Siemens and Kaupenjohann, 2003).

View larger version (37K): [in this window] [in a new window]   Fig. 3. Schematical scetch of a pan lysimeter and a humus lysimeter with funnel (a), filter body (b) and tube connection (c) respectively nylon mesh.

View larger version (15K): [in this window] [in a new window]   Fig. 4. Schematical scetch of a wick sampler with wick (a), sampling tube (b), and sampling bottle (c) (after Brandi-Dohrn et al., 1996).

View larger version (66K): [in this window] [in a new window]   Fig. 5. Exemplary sectional drawing of a resin box. Pipe (a), filling of quartz sand or silt (b), mixture of quartz sand or silt and exchange resin (c), mesh (d).

View larger version (25K): [in this window] [in a new window]   Fig. 6. The data target determines the observation period, level of information, time and effort, and selects the optimal sampling device.

View larger version (22K): [in this window] [in a new window]   Fig. 7. Flow chart for decision guidance of the appropriate sampling system.