Terrestrial environment

Single and joint stress of acetochlor and Pb on three agricultural crops innortheast China


CHAO Lei , ZHOU Qi-xing , CHEN Su , CUI Shuang , WANG Mei-e

DOI:

Received July 31, 2006,Revised October 30, 2006, Accepted , Available online

Volume 19,2007,Pages 719-724

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In order to evaluate ecological risk of agrochemicals in agricultural environment, single and joint toxic e ects of an important herbicide and a typical heavy metal on root elongation of crops were investigated. Seeds of the three crops including wheat (Triticum aestivum), Chinese cabbage (Brassica pekimensis) and soybean (Glycine max) as the main crops in northeast China were exposed to acetochlor as a herbicide and lead (Pb) as a heavy metal using the pot-culture method, and meadow brown soil as one of the main soils distributed in northeast China was applied in the investigation. The results indicated that the interactive e ects of the two pollutants on root elongation of the three crops were very complicated although they had markedly significant (P<0.01) linear interrelationships based on the regression analyses. When the concentration of added Pb2+ reached 200 mg/kg, acetochlor and Pb had an antagonistic e ect on the inhibition of root elongation of the three crops. However, acetochlor and Pb had significantly (P<0.05) synergic e ects on the inhibition of root elongation when concentration of added Pb2+ was up to 1000 mg/kg. At the low concentration of added Pb, joint toxicity of acetochlor and Pb was more dependent on the concentration of Pb. Among the three crops, wheat was the most sensitive to the toxicity of Pb and Chinese cabbage was the most sensitive to the toxicity of acetochlor.

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