Description: Das Projekt "Development and evaluation of micro push-pull tests to investigate rhizosphere processes" wird vom Umweltbundesamt gefördert und von Eidgenössische Technische Hochschule Zürich, Institut für terrestrische Ökosysteme, Ökosystemmanagement durchgeführt. The rhizosphere, the soil under the direct influence of active plant roots, differs in many aspects from the bulk soil due to root, microbial and fungal activities. Most mechanistic rhizosphere research has been undertaken in microcosms, often in the absence of soil. The understanding of mechanistic processes in the rhizosphere soil is therefore highly fragmented. The use of micro-techniques for the collection of soil solution enables non-destructive in situ observation of soil solution chemistry at high spatial and temporal resolution. Micro suction cups were used successfully in conjunction with rhizoboxes that allow observing the development of root systems through a transparent front plate and allow a localized sampling of soil solution. Suction cups cannot only be used to extract solution from soils but also to inject small amounts of solution. Single-well injection-withdrawal tests, called 'push-pull' tests, have been used since many years for the quantitative determination of a wide rang of aquifer physical, biological and chemical characteristics. In a push-pull test a prepared solution containing one or more solutes and a non-reactive tracer is injected into the aquifer using an existing well; the test solution/ groundwater mixture is then extracted from the same location. Similar to investigations of subsurface microbial activity in aquifers, the scientific community agrees that in situ techniques are needed for rhizosphere research. This project aims to combine micro-suction cups with the push-pull test to create a miniaturized system that will be applicable to study reactions in the rhizosphere. It also aims for the first time to apply a push-pull test to investigate soil solution under unsaturated conditions. These micro-push-pull tests will allow us to get not only concentrations of solutes in the rhizosphere but to study in situ reactions in the rhizosphere at defined distances from the root. This project is based on the combined expertise on rhizosphere sampling and reactions in the Soil Protection Group and the expertise of the Soil Biology group on aquifer push-pull tests and the in situ investigation of microbial activity. The new micro push-pull test is expected to yield new in situ information not only of concentrations in solution but especially of reaction and exudation rates under conditions as undisturbed as possible.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Biopharmazeutikum ? Blech ? Schluckbrunnen ? Zürich ? Bodenbiologie ? Pflanzensamen ? Tracer ? Brunnen ? Rhizosphäre ? Pflanzenwurzel ? Grundwasser ? Untergrund ? Absaugung ? Bewertung ? Bodenlösung ? Bodenschutz ? Grundwasserleiter ? Terrestrisches Ökosystem ? Stoffgemisch ? Studie ? Technik ? Mikroorganismen ? Pilz ? Boden ? Biologische Aktivität ? Chemische Stoffeigenschaft ? Bodenprobe ? Forschung ? Gutachten ? in situ ? Bedarf ? Konzentrat ? BESTEHEND ? BETRACHTUNG ? NICHT GESTOERT ? ASPEKT ? PROBE ? PROJEKT ? STANDORT ? EIN ? EINSATZ ? ENTWICKLUNG ? UNSATURIERT ? UNTER ? UNTERSUCHUNG ? ERFASSUNG ? GEMEINSCHAFT ? VERARBEITEN ? VERHAELTNIS ? GEMISCHT ? ABHOLEN ? WISSENSCHAFTLICH ? LOESUNG ? NEU ? GRUPPE ? Kleinmenge ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2007-01-01 - 2010-12-31
Accessed 1 times.