磷营养元素与水稻幼苗镉吸收关系研究

以籼稻（Oryza sativa L.）9311为试验材料，水培法培养水稻幼苗，通过施加不同浓度梯度的磷、镉，研究水稻的生长发育状况。通过石墨炉原子吸收光谱分别检测水稻幼苗吸收镉的含量，发现当镉浓度为0.05 mmol/L时，随着磷浓度的增加，水稻幼苗镉含量与0.05 mmol/L 处理相比，分别增加了9.6%，21.8%和43.5%，但磷镉同时处理水稻地上部分镉含量比镉单独处理水稻的镉含量降低了25.7%，说明磷能降低镉由地下部分向地上部分的转移率。研究还表明，相同镉处理的情况下，水稻的干物质量随着磷浓度的增高先上升后下降，超氧化物歧化酶（SOD）等同工酶的活性呈先降低后升高的趋势，且312 mg/kg 磷浓度为最适处理量。

Relationship between phosphorus and cadmium absorption of rice seedlings

Taking Indica rice 9311 as material, this paper cultured rice seedlings by hydroponics, and studied the growth and development condition of rice under different concentration of phosphorus and cadmium, then used graphite furnace atomic absorption spectrometry to detect cadmium content in rice seedlings. The results showed that, when the content of adding cadmium was 0.05 mmol/L, the cadmium content of rice increased by 9.6%, 21.8% and 43.5% respectively with the increase of phosphorus content, but the phosphorus can inhibit the cadmium transportation from underground part to aerial part. When the cadmium concentration was the same, the dry weight of rice treated by different phosphorus concentration decreased after rising firstly, the activity of SOD decreased firstly and then increased, and 312mg/kg phosphorus concentration was the optimal one.