氮锌复合作用对白三叶草生长、氮锌吸收和生理生化特性的影响

采用砂培试验方法,系统研究了不同水平氮锌配施对白三叶生长和生理生化特性的影响。结果表明,在缺锌条件下,随施氮水平增加,白三叶氮代谢和清除活性氧的能力、IAA、GAs含量下降,ABA、MDA含量增加,氮锌配施对生长和元素吸收表现为拮抗效应;在足量供锌条件下,与低量供氮相比,中量供氮时,白三叶氮代谢和清除活性氧的能力、IAA、GAs含量增加,ABA、MDA含量下降,氮锌配施对生长和元素吸收表现为协同效应。当高量氮时,氮锌配施则表现为拮抗效应。在判断氮锌复合作用类型时,应区分生长量变化引起的“浓缩效应”和“稀释效应”,应以生长量和吸收量变化来确定氮锌复合作用的类型。

The Compound Effects of N and Zn on Growth, N and Zn Absorption and Physiological-Biochemical Characteristics of White Clover

Sand culture experiment,biochemical determination and plant analysis were used to investigate the effects of N and Zn combined application on growth of white clover,concentration of N and Zn in plant,as well as related mechanisms.The main findings showed that the effects of combined N and Zn application on growth,absorption and concentration of N and Zn of white clover as well as their physiological-biochemical characteristics were different at various levels of N and Zn.Under the condition of Zn deficiency,the content of IAA,GAs and SOD decreased and the content of ABA and MDA increased.Therefore,the growth and N and Zn absorption of white clover showed antagonism effect with the increasing rate of N supply.However,under the condition of Zn sufficiency,the content of IAA,GAs and SOD increased and the content of ABA and MDA decreased by suitable amount of N supply.Consequently,the growth and N and Zn absorption of white clover displayed synergism effect.Nevertheless,with high amount of N supply,the growth and N and Zn absorption of white clover displayed antagonism effect.The condensation effect and dilution effect should be considered when determining the types of N and Zn compound effect.The changes of growth rate and absorption rate of N and Zn should be used to determine the types of N and Zn compound effect.