苗期，根系活力随着硒浓度的变化，呈现出先增加后下降的趋势；
In seedling stage, the root activity increase at first and then descend with the Se concentration increasing.
日本塑料花盆的根系活力最大。
Pink root vitality of Japan plastic flowerpots was the best.
苗木根系活力除了受土壤干旱协迫程度的影响之外，还受到干旱持续时间的影响。
Root vigor was affected not only by the degree of soil drought but also by the duration of soil moisture.
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