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为了解涝渍条件下不同树种的耐涝性和适应性,通过田间模拟试验,分析了涝渍胁迫对1年生落羽杉、美国山核桃和乌桕实生苗生长及能量代谢酶的影响.试验分为对照、渍水和淹水3个处理,处理时间为60d.结果表明:在渍水和淹水条件下,3种树种的相对生长率均表现为落羽杉>美国山核桃>乌桕,落羽杉耐涝性最强,乌桕耐涝性最弱.涝渍条件下,3种树种的根冠比显著增加,更多的光合产物被分配到根系.3树种乙醇脱氢酶和乳酸脱氢酶活性显著升高,其中耐涝性强的落羽杉增加幅度不大,但一直维持在较高水平;而乌桕和美国山核桃在处理初期增幅较大,在处理后期呈下降趋势.3种树种的苹果酸脱氢酶、磷酸己糖异构酶和葡萄糖-6-磷酸脱氢酶-6-磷酸葡萄糖酸脱氢酶的活性均低于对照,其中落羽杉降幅最低,淹水条件下分别下降35.6%、21.0%和22.7%.耐涝性强的树种能够通过自身的调节,维持各种能量代谢途径的强度,为树种在低氧条件下的生命活动提供能量,进而维持一定的生长量.
In order to understand the waterlogging tolerance and adaptability of different tree species under the conditions of waterlogging, the effects of waterlogging stress on the growth and energy metabolism enzymes of 1-year-old Taxodium distichum, Control, waterlogging and flooding, the treatment time was 60 days.The results showed that the relative growth rates of three tree species under the conditions of waterlogging and flooding were as follows: Taxodium distichum> Pecan tree> Waterlogging was the strongest and waterlogging resistance was the weakest in the tree species.When the waterlogging condition was changed, the root / shoot ratio of the three tree species increased significantly and more photosynthetic products were distributed to the root system.The activity of alcohol dehydrogenase and lactate dehydrogenase , But the waterlogging resistance of Taxodium distichum increased little, but maintained at a relatively high level. However, there was a big increase in the initial treatment of the black jackfruit and pecan, and a downward trend in the later stage of treatment. The content of malic acid Dehydrogenase, hexose phosphate isomerase and glucose-6-phosphate dehydrogenase-6-phosphate gluconate dehydrogenase activities were lower than the control, of which Taxodium had the lowest decline, submerged conditions decreased by 35.6%, respectively, 21.0% and 22.7%. The flood-tolerant tree species can pass their own Festival, maintaining the strength of the various energy metabolism pathways, trees provide energy for life activities under hypoxic conditions, and thus maintain a certain growth.