title: Long-term effects of heavy metals and microelements on nematode assemblage.
abstract: Effects of Cd, Cr, Se and Zn at a maximum rate of 270 mg kg(-1) were studied on a nematode assemblage after 6-10 years of application. Winter wheat, sunflower, sorrel, barley and rape were grown on the experimental field. Cd had a moderate effect on nematodes in spite of the fact that this element significantly decreased plant biomass. Cr was harmful to plants only in the first year of the study. However, Cr decreased Aporcelaimellus density and maturity index, increased Pratylenchus density and bacterial-fungal ratio, changed the c-p structure and feeding type composition. Se proved to be very toxic at a concentration of 11 mg kg(-1) (NH(4)-acetate+EDTA soluble form). Some advantageous effects of Zn were found in the first year. These disappeared later on. Remarkable between-year fluctuations of the nematode assemblage composition were observed.
authors.affiliation: Department of Zoology and Ecology, Szent István University, H-2103, Páter K. u. 1, Gödöllo, Hungary.bakonyi@fau.gau.hu
authors.forename: Gábor
authors.initials: G
authors.lastname: Bakonyi
authors.forename: Péter
authors.initials: P
authors.lastname: Nagy
authors.forename: Imre
authors.initials: I
authors.lastname: Kádár
mesh_terms: D000383:Agriculture; D000818:Animals; D001419:Bacteria / Q000187:drug effects; D019216:Metals, Heavy / Q000032:analysis / Q000494:pharmacology*; D009348:Nematoda / Q000187:drug effects*; D012722:Sewage; D012989:Soil Pollutants / Q000032:analysis / Q000494:pharmacology*
chemical_list: D019216:Metals, Heavy; D012722:Sewage; D012989:Soil Pollutants