【摘要】 采用盆栽试验研究了潮褐土中施用水杨酸和半胱氨酸对土壤中重金属Cd、Zn和Pb的活化影响,以及对油菜吸收和生长的影响。结果表明,两种有机酸在一定的添加浓度范围内,可以缓解重金属对油菜地上部的毒害,但浓度较高时,却使油菜生物量显著下降。在一定程度上,水杨酸不但可以促进土壤中Cd的活化,还可以提高油菜地上部对Cd的吸收,两者呈显著正相关。当水杨酸与土壤中Zn的摩尔比大于1时,能有效的促进土壤中Zn的活化。土壤中有效态Pb含量则与水杨酸添加量呈显著正相关,同时水杨酸也提高了油菜地上部对Zn、Pb的吸收;随半胱氨酸添加量的增加,土壤中有效态Cd、Zn、Pb含量与油菜地上部重金属含量均有所提高,在摩尔比半胱氨酸/Pb=1时,半胱氨酸不但促进了土壤中Pb的活化,同时也提高了油菜地上部对Pb的吸收。更多还原

【Abstract】 The effects of both organic acids (salicylic acid and cysteine) on mobilization of Cd, Zn and Pb were studied in meadow cinnamon and its accumulation in shoot of rape through pot experiments. The results showed that the two organic acids at lower concentrations could reduce the toxicity of heavy metals. However, when the contents of the two organic acids were higher, the biomass of rape decreases remarkably. Salicylic acid could enhance both mobilization of Cd2+ and Cd uptake in shoot of rape to some extent, and there was an obviously positive correlation between them. When the molar ratio of salicylic acid/Zn was above 1, salicylic acid could enhance the mobilization of Zn. The content of available Pb in soil showed an obviously positive correlation with the amount of salicylic acid, while salicylic acid could also increase the Zn and Pb absorption in shoot of rape. With cysteine increasing, the available Cd, Zn, Pb in the soil and heavy metals uptake in shoot of rape would increase too.When the molar ratio cysteine/Pb was 1,cysteine enhanced both mobilization of Pb in soil and amount of Pb in shoot of rape.更多还原