不同形态氮素对水稻体内镉形态的影响

采用不同形态氮营养液的培养方法，研究不同形态氮素对水稻体内镉存在形态的影响。结果表明，两种不同形态氮素即ＮＨ＾＋４－Ｎ，ＮＯ＾－３－Ｎ营养液培养中，ＮＨ＾＿４－Ｎ促进了水稻对镉的吸收，并增加了水稻根中和地上部的水提取氮和氯化钠提取态镉的含量；而ＮＯ＾－３－Ｎ处理却增加了醋酸提取态镉含量。盐酸提取态和残留态的镉两处理差异不明显。

Influence of the Form of Nitrogen on the Chemical Forms of Cadmium in Rice

In order to understand the effect of the different forms of nitrogen on Cd content and its chemical forms in rice, nutrient solution culture method was used and the rice was grown in complete nutrient solution with ammonium or nitrate as the nitrogen form.The result indicated that the roots and shoots of rice grown in NH4-N had higher Cd content compared with NO3-N one. The concentration of H2O-extractable Cd and NaCl-extractable Cd content of rice grown in NH4-N solution were significantly higher than those in NO3-N solution, but the concentration of HAc-extractable Cd content was higher in NO3-N. HCl-extractable and residual Cd content were insignificantly different in both nutrition.