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玉米早49×多黄8的种子分别以0、2、5、10、40和100ppm 含80%La 和 Ce 的混合稀土溶液浸泡24小时。幼苗生长于 Hoagland 培养液,辅以人工光照和溶液通气。移栽两周后收获。测定株高、根长、植株叶面积、地上与地下部鲜重和干重以及植株各部分 La、Ce、Ca、Zn、Cu、Mn、Mo 的含量。结果表明,植株中稀土元素含量随处理的稀土浓度增加而增加。植株中 La 和Ce 的含量及 Ce/La 比值均高于培养液中的值,说明玉米幼苗对 La、Ce 的吸收具主动性和选择性。在本实验条件下,2—5ppm 稀土溶液的处理,对幼苗生长有促进作用。逐步回归分析也指出,La 和 Ce 是所测元素中影响植株生长的主要因素。从元素含量分析的结果中还看到 La、Ce为 Ca 的正相关。
Maize as early as 49 × yellow 8 seeds were 0,2,5,10,40 and 100ppm containing 80% La and Ce mixed rare earth solution soak for 24 hours. Seedlings were grown in Hoagland broth supplemented with artificial light and solution aeration. Harvest two weeks after transplanting. The plant height, root length, leaf area of plant, fresh weight and dry weight above and below ground and the contents of La, Ce, Ca, Zn, Cu, Mn and Mo in different parts of plant were measured. The results showed that the content of rare earth elements in plants increased with the increase of the concentration of rare earths. The content of La and Ce and the ratio of Ce / La in the plant were higher than those in the culture medium, indicating that maize seedlings have the initiative and selectivity for La and Ce absorption. Under the experimental conditions, the treatment of 2-5ppm rare earth solution can promote seedling growth. Stepwise regression analysis also pointed out that La and Ce were the main factors affecting the plant growth in the tested elements. From the results of elemental content analysis, we also find that La and Ce are positive correlations of Ca.