摘要： 于盆栽条件下研究了冬小麦根系活力的动态变化规律，结果表明，不同的生育阶段根系活力的变化特点不同。春前以营养生长为主的阶段，根系活力不高，符合回归方程：y=36.16-0.62a+2.7×10^-3x²（r=-0.7460）。春后进入营养生长与生殖生长并进期服系活力增高。当转入以生殖生长为主的阶段后，根系活力又下降，符合回归方程：y=4.0749xe^-0.0464x（r=-0.9900），高峰是在孕穗期。根干重和茎叶干重的变化趋势与根系活力不同。根系活力随着穗重的增加而下降。

关键词: 冬小麦, 根系活力, 根干重, 穗干重

Abstract: The dynamic change rule of the winter wheat root system vigour was studied under the condition of pot culture. The results showed that the characteristics of root system vigour change differed at different growth and development stages. Before spring the wheat seedling was at the vegetative growth and the roots vigour was weaker yet. Its regression equation is:y=36.16-0.62a+2.7×10^-3x²（r=-0.7460）. After spring the vegetative growth and reproductive development are all last, so the roots vigour increases. When it re-tures to the reproductive development stage, the root system vigour decreases. The regression equation is:y=4.0749xe^-0.0464x（r=-0.9900）. At the spike formation stage, the root system vigour is the strongest. The change tendency of dry weight of the roots and of the stem and leaves is different from that of root system vigour. The root system vigour decreases with the increase of spike dry weight.

Key words: Winter wheat, Root system vigour, Root dry weight, Spike dry weight