不同水分条件对中山杉406生长与生理的影响

    Effects of t Soil Water Conditions on Growth and Physiological of Taxodium ‘Zhongshanshan 406’

    • 摘要: 采用室内盆栽方式,以两年生落羽杉属杂交树种“中山杉406”(Taxodium ‘Zhongshanshan 406’)为试验材料,设置土壤含水量为土壤田间持水量的70%(对照)、渍水(水面与土面持平)、淹水10 cm 3个处理,研究中山杉406的生物量,N、P等营养元素含量,以及超氧化物歧化酶(SOD)活性等生长与生理指标的变化。结果表明,与对照相比,渍水与淹水能显著增加中山杉406的地茎,降低植株的根冠比,而对植株的株高、鲜质量、株高增长率与鲜质量增长率无显著影响。淹水处理后,中山杉406根部P、K、Na、Mg 含量显著高于对照。中山杉406叶片的叶绿素含量、SOD活性、过氧化物酶(POD)活性、丙二醛(MDA)含量以及根系活力在对照、渍水、淹水3个处理间无显著差异。此外,淹水处理中山杉406出现皮孔肥大以及长出气生根等对淹水的适应特征。可见,中山杉406具有良好的耐水湿特性,可应用于湿地的恢复与构建。

       

      Abstract: A pot experiment was conducted to investigate growth and physiological indicators of Taxodium ‘Zhongshanshan 406’ T. mucronatum Tenore ♀ ×T. distichum(Linn.)Rich ♂under three different water treatments,and whether the tested plant can be used in the construction of wetland.Three water treatments were designed:cotrol(water content to be 70% of the field water capacity),soil waterlogging(water surface and soil surface on the same level)and soil submersion(10 cn surface water layer).Results show that when compared to the control,soil waterlogging and soil submersion significantly increased the plant's ground diameter and reduced its ratio of root dry weight to shoot dry weight,but had no significant effects on its height,fresh weight,height increase rate and fresh weight increase rate.Soil submersion also increased P,K,Na and Mg contents significantly in its roots as compared to the control.However,no significant differences were observed between the three water treatments in leaf chlorophyll content,SOD activity,POD adtivity,MDA content and root activity.In addition,T. ‘Zhongshanshan 406’ displayed its excellent adaptability to soil submersion,having amplitude lenticels and aerial roots.In short , T. ‘Zhongshanshan 406’is tolerant to water stress and has an outstanding potential as a wetland plant.

       

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