An 3 Lysimetermonolithen unterschiedlichen Bodentyps (Braunerde -L5, Pseudogley -L7, Schwarzerde -L10) sowie an deren Herkunftsflächen (H5, H7, H10) wurden verschiedene bodenbiologische Parameter untersucht. Die mikrobiologischen Aktivitäten wiesen in allen Proben einen ausgeprägten Tiefengradienten auf und waren sogar z. T. bis in Tiefen von 175 cm noch nachweisbar (Biomasse, Basalatmung, DMSO-Reduktion, alkalische Phosphatase). Die metabolischen Quotienten für CO 2 waren auf den Herkunftsflächen meist deutlich niedriger als in den Lysimetern. Ob dieser Befund ebenso wie die etwas niedrigeren C mik /C org -Quotienten der Lysimeter auf einen verminderten C-Umsatz in den Lysimetern hinweisen könnte, muß durch weitere Untersuchungen geklärt werden. Die Erfassung der Mesofauna ergab größere Individuendichten für Collembolen und Milben (Braunerde) bzw. nur für Milben (Schwarzerde) in den Lysimetern, allerdings war hier das Untersuchungsmaterial für verallgemeinernde Aussagen nicht ausreichend. STICHWÖRTER: Boden, Lysimeter, Enzymaktivitäten, Mesofauna, mikrobielle Biomasse
BIOLOGICAL STUDIES ON SOIL SAMPLES FROM LYSIMETER MONOLITHS AND THEIR AREAS OF ORIGINSix layers of three different soil monoliths from lysimeters (Cambisol -L5, Stagnic Gleysol -L7, Pheozem -L10) and their areas of origin (H5, H7, H10) were investigated. Nearly in all samples microbiological activities, e.g. microbial biomass, basal respiration, DMSO reduction and alkaline phosphatase, could be detected up to a depth of 175 cm. Metabolic quotients for CO 2 in samples from the area of origin were lower than those from lysimeter samples. This could be an indication of a lower carbon turnover in lysimeters but these findings have to be verified in further experiments. Investigating mesofauna there were found higher abundances of springtails and mites (Cambisol) or of mites only (Chernozem) in lysimeter samples, but because of the limited sample material it is not possible to generalize these results.
The aim of this study was to test the effect of heavy-metal contamination (Cu, Zn) on the growth of Chlorella kessleri. Two soils (Chernozem and Podzoluvisol) were contaminated with several amounts of copper and zinc (100-3000 ppm), and the effects of the soil eluates on the growth of the alga were examined over several days. The soil eluates inhibited algal growth in dependence on metal concentration and soil properties. It was shown that this algal assay, which was first developed for aquatic samples, in principle seems to be suitable also in monitoring soil contamination.
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