喷施硅铈溶胶缓解镉铅对小白菜毒害的研究

EFFECTS OF SPRAYING SILICON AND CERIUM SOLS ON RELIEVING TOXICITY OF Pb AND Cd IN THE CABBAGE

通过大田试验,在轻度镉-铅复合污染菜地向小白菜叶面喷施不同浓度的硅溶胶、铈溶胶及硅铈复合溶胶,研究其对产量、品质、抗氧化酶活性及Cd、Pb吸收的影响。结果表明,喷施硅铈溶胶均能促进小白菜生长,增加小白菜生物量和提高维生素C、可溶性糖的含量,降低亚硝酸盐的含量;显著增强抗氧化系统保护酶(SOD、POD)活性和降低小白菜地下部、地上部中镉、铅的含量及累积量。在不同浓度的施硅和施铈处理中,喷施0.50 g kg-1SiO2处理和0.20 g kg-1CeO2处理在增产、提升品质和缓解重金属对小白菜毒害上效果最佳,喷施硅铈复合溶胶虽效果显著,但与单独施硅、施铈相比无明显提高。

A field experiment of foliar application of silicon sol, cerium sol and silicon-cerium composite sol of different concentrations on cabbage in field mildly contaminated with cadmium and lead, was conducted to study effects of the application on yield, quality, antioxidant enzymes （SOD, POD） activities and Cd/Pb absorption, and hence to determine optimum concentration of the silicon sols and cerium sols to be sprayed for relieving toxicity of Cd and Pb. Results show that spraying both silicon and cerium sols could ＇promote growth of cabbage, increase contents of vitamin C and soluble sugar; reduce nitrite content, enhance activities of SOD and POD, the antioxidant enzymes, and decrease contents and accumulation of Cd and Pb in root and shoot. In conclusion, among the treatments of silicon sols and cerium sols different in concentration, the one of 0. 50 g kg-1（ Si02 ） silicon sols and/or 0.20 g kg-1（ Ce02 ） cerium sols was the most signifi- cant in effect, but no significant difference was observed between the treatment of spraying one single sol and the treatment of spraying both sols in combination.