铬污染对三种常见蔬菜种子萌发和生长的影响研究

通过研究不同浓度铬（Cr6＋）对叶类蔬菜小白菜、上海青和甜芥菜种子萌发和幼苗生长的影响，得出结论：不同浓度的Cr6＋对小白菜种子的萌发、根长和苗高都表现出一定影响，且随浓度的增大，抑制作用逐渐增大；当浓度小于1．0mg／L时，Cr6＋对小白菜发芽率、根长和苗高有促进作用，而当浓度小于2．0mg／L时，Cr6＋对甜芥菜的发芽率、根长和苗高有促进作用，而当浓度大于2．0mg／L时则表现为抑制作用；Cr6＋对上海青的总体影响不是很明显。总的来说，当Cr6＋的浓度大于2．0mg／L时，三个实验蔬菜品种的发芽势、发芽率、根长及苗高都受到抑制，Cr6＋的抑制作用强弱表现为：小白菜〉甜芥菜〉上海青。

The Impact of Chromium Pollution on Seed Germination and Growth of Three Kinds of Common Vegetables

Through the research of influence of different chromium（Cr6＋） concentration on seed germination and young seedling growth of leafy vegetables such as the Chinese Cabbage, Shanghai Green and sugared leaf mustard. The result showed that： Different concentration of Cr6＋ displays certain influence on Chinese Cabbage seeds＇ germination, root length and seedling height, along with concentration enlargement, the inhibitory action increases; When concentration is lower than 1.0 mg/L, Cr6＋ has the promotion action on Chinese Cabbage＇s germination percentage, root length and seedling height. When concentration is lower than 2.0 mg/L, Cr6＋ has the promotion action on sugared leaf mustard＇s germination percentage, root length and seedling height. And while concentration is higher than 2.0 mg/L, Cr6＋ displays inhibitory action, and influence on Shanghai Green is not obvious. Generally speaking, when Cr6＋ concentration is higher than 2.0 mg/L, all three vegetables shows inhibitory action. The Cr6 inhibitory sequence is Chinese Cabbage 〉 Shanghai Blue 〉 sugared leaf mustard .