用ＮＡＡ处理大白菜根部和叶部，对其吸收和转运４５Ｃａ的变化进行了研究。结果表明，不论根部施用ＮＡＡ或叶面喷洒ＮＡＡ均使大白菜根对４５Ｃａ的吸收增加，提高茎叶中４５Ｃａ的积累，尤其心叶中４５Ｃａ的积累显著提高，同时改变心叶４５Ｃａ分布，使心叶叶缘的４５Ｃａ积累明显增加，且根部施用效果比叶面喷洒效果更明显。植株整体放射自显影表现出相应结果。 The roots and leaves of Chinese cabbage were treated with NAA, and the changes of their absorption and transport 45Ca were studied. The results showed that both the root application of NAA and foliar spraying of NAA increased the uptake of 45Ca in the root of Chinese cabbage and increased the accumulation of 45Ca in the stem and leaf. In particular, the accumulation of 45Ca in the heart leaf significantly increased while the 45Ca distribution in the heart leaf changed. Foliar 45Ca accumulation increased significantly, and the root application effect is more obvious than the foliar spray effect. Overall autoradiography of plants showed corresponding results.