title: Effect of long-term zinc pollution on soil microbial community resistance to repeated contamination.
abstract: The aim of the study was to compare the effects of stress (contamination trials) on the microorganisms in zinc-polluted soil (5,018 mg Zn kg(-1) soil dry weight) and unpolluted soil (141 mg Zn kg(-1) soil dw), measured as soil respiration rate. In the laboratory, soils were subjected to copper contamination (0, 500, 1,500 and 4,500 mg kg(-1) soil dw), and then a bactericide (oxytetracycline) combined with a fungicide (captan) along with glucose (10 mg g(-1) soil dw each) were added. There was a highly significant effect of soil type, copper treatment and oxytetracycline/captan treatment. The initial respiration rate of chronically zinc-polluted soil was higher than that of unpolluted soil, but in the copper treatment it showed a greater decline. Microorganisms in copper-treated soil were more susceptible to oxytetracycline/captan contamination. After the successive soil contamination trials the decline of soil respiration was greater in zinc-polluted soil than in unpolluted soil.
authors.affiliation: Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland. beata.klimek@uj.edu.pl
authors.forename: Beata
authors.initials: B
authors.lastname: Klimek
mesh_terms: D000222:Adaptation, Physiological; D000900:Anti-Bacterial Agents / Q000633:toxicity; D002215:Captan / Q000633:toxicity; D003300:Copper / Q000633:toxicity; D004352:Drug Resistance, Microbial / Q000187:drug effects / Q000502:physiology; D005659:Fungicides, Industrial / Q000633:toxicity; D010118:Oxytetracycline / Q000633:toxicity; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis / Q000633:toxicity*; D013312:Stress, Physiological; D015032:Zinc / Q000032:analysis / Q000633:toxicity*
chemical_list: D000900:Anti-Bacterial Agents; D005659:Fungicides, Industrial; D012987:Soil; D012989:Soil Pollutants; D003300:Copper; D002215:Captan; D015032:Zinc; D010118:Oxytetracycline