结果表明：幼苗的抗旱性与根干重呈显著正相关。
Significant positive correlation coefficient was found between drought resistance and root dry weight.
根际效应的改变是引起差巴嘎蒿种群衰退的又一重要因素。
Change of rhizosphere effect was another important factor of population decline.
单株玉米的根干重随水分条件的改善而提高，高N处理的玉米根重低于相应的低N处理；
The dry root weight under high N level was lower than that under low N level;
单株玉米的根干重随水分条件的改善而提高，高N处理的玉米根重低于相应的低N处理；
The dry root weight under high N level was lower than that under low N level;
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