title: [Effects of lead on the growth and reproduction of Eisenia fetida with aged soils].
abstract: In this study, effects of Pb (NO3)2 on the growth and reproduction of Eisenia fetida were investigated with artificial soils. The results showed that: compared with the control group, the growth of E. fetida in contaminated soil was inhibited significantly with increasing Pb (NO3)2 concentrations. But there were great differences in the extent of inhibition after 0, 7, 28 and 84 days of aging in the artificial soils. The most obvious effect occurred in 1000 mg x kg(-1) and 1500 mg x kg(-1) experimental groups. There was a very big difference in the effects of Pb (NO3)2 on reproduction of E. fetida with different aging times. The medium effective concentration (EC50)values of cocoon production inhibition were 1085.10, 1163.32, 1666.86 and 1606.94 mg x kg(-1). In addition, the EC50 values of the number of juvenile inhibition were 700.01, 703.88, 1 031.34 and 1 017.89 mg x kg(-1), respectively. This study indicates that soil aging which affects the toxicity of Pb (NO3)2 should be taken into consideration when toxicity tests of Pb (NO3)2 were carried out. The results could provide a scientific basis for the ecological risk assessment of aging soils and soil environmental quality standards.
authors.forename: Li-Hong
authors.initials: LH
authors.lastname: Chen
authors.forename: Zheng-Tao
authors.initials: ZT
authors.lastname: Liu
authors.forename: Zheng
authors.initials: Z
authors.lastname: Fang
authors.forename: Xiao-Nan
authors.initials: XN
authors.lastname: Wang
authors.forename: Wan-Hua
authors.initials: WH
authors.lastname: Wang
mesh_terms: D000818:Animals; D007854:Lead / Q000494:pharmacology*; D009566:Nitrates / Q000494:pharmacology; D009835:Oligochaeta / Q000187:drug effects / Q000254:growth & development*; D012098:Reproduction / Q000187:drug effects; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000494:pharmacology*
chemical_list: D009566:Nitrates; D012987:Soil; D012989:Soil Pollutants; D007854:Lead; C017461:lead nitrate