| Abstract: | Ecological characteristica of soils which were transformed by urban and industrial impact of the Brücktor district in Oberhausen (Ruhr area) This paper presents the results of Urbic Anthrosols from eight different sites which contain partly alkalizing material of technogenic origin in an urban-industrial area of Oberhausen. The alkalinity of the technogenic material in the top soil layer (0–3 dm depth) would enable these Urbic Anthrosols to neutralize an annual H+-deposition of 0.2 mol per m2 for about 185 to 1630 years (median nearly 1000 years). The cation exchange potential of these soils is nearly always low and in the layers dominate ferrimagnetic Fe oxides which have a minor P-sorption capacity. Also these soils are deeply enriched with plant nutrients (up to > 2.5 kg N/m3, up to > 1 kg P/m3), which show high concentrations of plant available, mobile fractions. In the profiles with deposit layers of a coarse texture the root growth is prevented by cementation or actually limited to the upper 20 cm. Furthermore their usable field capacity for water of the rooting zone is low. Therefore the vegetation cannot take up the plant available nutrient fractions which can be leached through the profiles. |
