烟草对重金属铅铬砷汞积累分配特性分析

Analysis of Characteristics of Accumulation and Translocation of Tobacco to Different Heavy Metal Elements

为研究烟草对重金属元素铅、铬、砷与汞的富集特点,探讨其在烟株各器官间转移与分配的规律,为烟草吸收重金属元素的机制研究提供参考。以烤烟品种中烟103为材料,在移栽后30,45,60,75,90,110 d,采集烟株样品,分析重金属元素在烟株的空间分布与动态演变。结果表明,烟草对不同重金属元素的吸收积累特点不同。烟草的根对铅及铬保持活跃吸收,根系铅及铬的含量显著高于茎与叶片。根中砷的含量一直维持在较高的水平,显著高于茎与叶片。但在栽后45,75 d,下部叶的砷含量反而最高。叶片中汞的含量显著高于根与茎。在生育后期,中部叶的汞含量显著高于其余部位。

To provide the reference to tobacco heavy-metal elements absorption mechanism research ,the experi-ment was carried out on characteristics of heavy-metal enrichment ,transfer and distribution of heavy-metal elements between organs of tobacco .With Zhongyan 103 as material ,tobacco samples were acquired ,heavy-metal elements in tobacco plant spatial distribution were detected after transplanting 30,45,60,75,90 and 110 days.Tobacco root ab-sorption of lead and chromium remained active throughout its living stage , and lead and chromium content in the roots were significantly higher than those of stems and leaves .Tobacco arsenic content in the root has been main-tained at a high level , and was significantly higher than that of stem and leaf .But in 45 days and 75 days ( After transplanting ) ,lower leaves arsenic content were the highest .Mercury content in leaves was higher than that in the root and stem .However ,middle leaves mercury content was significantly higher than that of other parts of tobacco plants in the late growth period .Tobacco varies in absorption and accumulation to different heavy-metal elements . Mercury behaves as late accumulation ,and lead,chromium and arsenic to metaphase accumulation .Mercury accu-mulation and root-to-leaf transfer capability is the strongest among the four elements .Lead and chromium are mainly stored in root ,and the storage of arsenic and mercury is almost equally in root and leaf .