Three urban-industrial sites were chosen for monitoring the development of soils and the dynamics of plant and animal populations. All study sites are located within the core of the urban-industrial agglomeration of the Ruhr. All were used formerly as coal mines and are now integrated into the Projekt Industriewald Ruhrgebiet, which ensures the future existence of the sites. The first is Zollverein coal mine (20 ha), located within the city of Essen. The other sites are within the city of Gelsenkirchen: the Rheinelbe coal mine (42 ha) and the Alma coal mine (26 ha). The area of each plot is 0.1 ha, including a subplot for vegetation relevees (100 m2). The other analyses of vegetation structure, soil profiles and faunistic sampling were done outside of this subplot. Table 1 gives further information on the studied plots. For five plots, the parent material for soil genesis was hard coal-mining spoil from a depth of more than 1,000 m; the ecosystem dynamics on the remaining plot started with building rubble.
Table 1. Location of the permanent plots (0.1 ha) on three sites (former Alma, Rheinelbe and Zollverein coal mines). The ecological features describe site and vegetation characteristics at the beginning of the investigation in 1999
|
Table 2. Methodological approaches for analysing chemical, physical, microbiological and zoological soil properties in the soil profiles with information on the planned repetitions (repetition intervals in brackets)
|
Gravimetric measurement of 500-cm3 soil samples
Combustion residue loss (gravimetric)
Oxygen uptake, a Sapromat (Schinner et al. 1993) Oxygen uptake after addition of glucose, Sapromat (Schinner et al. 1993)
Indirect estimation by conversion factor from substrate-induced respiration at 22°C (Anderson and Domsch 1978; Alef 1991)
With the substrate TTC incubated for 24 h; modified from Thalmann (Schinner et al. 1993) Litterbag method (Bocock and Gilbert 1957; Dunger and Fiedler 1989; Alef 1991)
Zoological (5 years)
Lumbricidae: species richness formalin expulsion/hand picking and abundance
Enchytraeidae: species rich – Wet extraction according (Dunger and Fiedler ness and abundance 1989)
Springtails (Collembola): de – Dry extraction by Berlese-Tullgren method
termination to genus level and
abundance