The correlations between them and NUE are either significant or extremely significant except root active uptake area, which has significant correlation to NPE.

• 除根系活跃吸收面积外，它们与吸收效率的相关性都达到了显著或极显著的水平，而根系活跃吸收面积与生理利用效率的相关性达到了显著水平。