论文部分内容阅读
本试验以豇豆为试材,采用土培法,研究了土壤中不同浓度的外源铬(0、2、8、15、25mgkg-1)对豇豆幼苗生长及生理生化特性的影响。结果表明,外源Cr6+浓度为2mgkg-1时,促进了豇豆幼苗的生长;浓度为15mgkg-1时却显著抑制了幼苗的生长;浓度达25mgkg-1时出苗迟缓,子叶不能展开,茎明显增粗,且有黑根及死苗现象。对SOD活性的影响表现为随着Cr6+浓度的增大,先升高后降低。说明,低浓度的外源铬促进了豇豆幼苗的生长,高浓度的外源铬抑制了幼苗的生长。
In this experiment, cowpea was used as test material to study the effects of different concentrations of exogenous chromium (0, 2, 8, 15, 25mgkg-1) in soil on the growth and physiological and biochemical characteristics of cowpea seedlings. The results showed that the exogenous Cr6 + concentration of 2mgkg-1 promoted the growth of young cowpea seedlings; while the concentration of 15mgkg-1 significantly inhibited the growth of young seedlings; when the concentration reached 25mgkg-1, the emergence was delayed, the cotyledons could not be expanded, Crude, and black root and dead seedlings phenomenon. The effect on SOD activity showed as Cr6 + concentration increased, then increased and then decreased. The results showed that low concentration of exogenous chromium promoted the growth of cowpea seedlings and the high concentration of exogenous chromium inhibited seedling growth.