涝渍胁迫对杨树苗期叶片生长及其生理性状的影响

以３种典型的美洲黑杨苗木（Ｉ６９、ＮＬ８０１０５和ＮＬ８０３５１）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，Ｉ６９杨在强涝渍胁迫下抗耐能力较高。ＮＬ８０３５１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。

Effects of waterlogging stress on leaf growth and physiological properties of poplar clone seedlings

Based on the research of the poplar seedlings (I 69, NL 80105, NL 80351) under the waterlogging stress with pool planting experiments, the results indicated that waterlogging stresses seriously inhibited the growth in leaves of all three poplar clones, the growth rate of the leaf area was decrease. Stress led to a reduction in the stomatal openning intensity. Compared with the control the water potential and the MDA content of leaves were increased in some degrees, but the SOD activity of leaves had no great changes. There were some differences in the contents of total N, total P and total K among three poplar clones under the various treatments. According to the research, it was considered that clone I 69 had the highest resistance under the strong waterlogging stress, however, under weak waterlogging stress, the resistance of clone NL 80351 was the highest. Short time (15 days) stress had no remarkable influence on the growth of poplar clones, but great effect was present under the stress of long time (30 days or more) treatment.