铅镉复合污染对土壤和水稻叶片生理生化特性的影响

Effects of Compound Pollution of Pb and Cd on Soil and Physiological and Biochemistrical Characteristics of Rice Leaves

采用盆栽试验,研究了不同程度的铅镉复合污染对水稻叶片生理生化特性的影响。结果表明,铅镉污染导致土壤pH显著降低;玉香油占(Y)在低浓度污染下有机质显著下降,然后随着重金属污染程度升高。天优998(T)在低浓度污染下有机质变化不明显,然后显著降低;除了玉香油占在分蘖期低浓度下SPAD有显著增加,铅镉胁迫显著降低了叶片SPAD值,天优998分蘖期在高浓度下SPAD值显著下降,孕穗期SPAD随重金属污染程度增加而显著增加,灌浆结实期SPAD随重金属污染程度增加而显著降低;水稻叶片抗氧化酶活性在低度铅镉胁迫下活性增加,高度胁迫下活性下降,POD对铅镉胁迫比SOD具有较强的敏感性;MDA含量与铅镉污染程度成正相关。

Effects of compound pollution of Pb and Cd on soil and physiological and biochemistrical Characteristics of rice leaves were studied by pot experiment with cultivating rice. The results showed that, compound pollution of Pb and Cd led to a significant reduction in soil pH; soil organic matter contents declined significantly at low concentrations and then increased with the degree of heavy metal pollution for Y, and it did not change significantly under low contaminated, and then significantly reduced for T; SPAD had significantly reduced under compound pollution of Pb and Cd except for that SPAD has significantly increased under low contaminated at tillering stage for Y, SPAD values decreased significantly in high concentrations at tillering stage, increased significantly with the levels of heavy metal pollution at booting stage, reduced significantly at filling stage. Antioxidant enzyme activities in rice leaves increased in the low degree of Po and Cd pollution and decreased under high levels of pollution , POD has a strong sensitivity to has a strong sensitivity to than SOD; It showed a positive correlation between MDA content and the degree of pollution with Po and cd.