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以３种典型的美洲黑杨苗木（Ｉ６９、ＮＬ８０１０５和ＮＬ８０３５１）在不同的涝渍胁迫条件下，苗木叶面积生长明显减慢；叶片气孔开度显著减小；叶片水势和丙二醛（ＭＤＡ）含量有所增加；超氧化物歧化酶（ＳＯＤ）活性无明显变化；叶片中的全Ｎ、全Ｐ和全Ｋ含量发生变化。综合分析认为，Ｉ６９杨在强涝渍胁迫下抗耐能力较高。ＮＬ８０３５１杨在弱涝渍胁迫下适应性较强，短期涝渍对杨树无性系苗木无明显影响，３０ｄ以上的涝渍对其影响显著。
Three typical Populus tomentosa seedlings (I 69, NL 80105 and NL 80351) under different waterlogging stress conditions, seedling leaf area growth was significantly slowed down; leaf stomatal opening was significantly reduced; leaf water potential and Malondialdehyde (MDA) content increased; superoxide dismutase (SOD) activity did not change significantly; leaf N, P and K changes. Comprehensive analysis shows that I 69 Yang in the strong waterlogging stress resistance to higher resistance. NL80351 poplar had strong adaptability under weak waterlogging stress. Short-term waterlogging had no obvious effect on poplar seedlings. Waterlogging more than 30 days had significant effect on it.