Description: Das Projekt "Die Bedeutung des Bodenskeletts als Speicher für kurzfristig verfügbare Nährelemente" wird vom Umweltbundesamt gefördert und von Universität Freiburg, Institut für Geo- und Umweltnaturwissenschaften, Professur für Bodenökologie durchgeführt. For soil chemical analyses, the soil skeleton is normally rejected because this size fraction is considered to have no significant short-term nutritional potential. In order to revise this practice, the short-term potential for ion storage and ion mobilization of the isolated and cleaned soil skeleton was investigated by model experiments, using undisturbed and homogenized soil samples as references. The cleaned skeleton was embedded in an inert quartz-silt-matrix ('fine earth substituted soil systems'). The study considered different soil profiles on granite, gneiss and sandstone bedrock from Black Forest, Germany. The method allowed for the investigation of soil columns at a water status near field capacity. After the extraction of water soluble ions with deionized water, cation exchange properties were determined by percolation of the soil cores with ammonium chloride (NH4Cl). The results revealed site-specific ion mobilization potentials of the soil skeleton. Below the A-horizon, the skeleton fraction of the gneiss site plays the dominant role as a source for short-term base cation supply. The fine earth of the corresponding soil horizon had lost this function, since the base saturation was less than 5 %. More than 80 % of the exchangeable Ca and Mg in naturally layered soil cores originate from the skeleton. The skeleton of the granite site had much lower ion mobilization rates, but nevertheless, due to the high skeletal contents in soil the importance for ion mobilization must not be neglected. The soil skeleton of the sandstone site showed cation exchange capacities which were comparable to the gneiss site, but its ecological importance is less because of the low skeleton content in soil.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Freiburg ? Schwarzwald ? Ammoniumchlorid ? Ökologie ? Bundesrepublik Deutschland ? Bodenökologie ? Chemische Analyse ? Kationen ? Sandstein ? Granit ? Technosol ? Schluff ? Unterboden ? Bodenaustausch ? Gneis ? Austauschkapazität ? Bodenprobe ? Bodenprofil ? Bodenhorizont ? Bohrkern ? Eigentum ? Gewässerzustand ? Ionen ? Ionenaustausch ? Modellversuch ? Quarz ? Studie ? Versorgung ? Boden ? Perkolation ? Feldkapazität ? Versickerung ? Wald ? Gewässer ? Quellen ?
Region: Baden-Württemberg
Bounding box: 9° .. 9° x 48.5° .. 48.5°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1998-01-01 - 2000-12-31
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