水分胁迫对希蒙得木幼苗生物量的影响

Effect of Water Stress on Biomass Allocation of Simmondsia chinensis Seedlings

    摘要
  • 摘要: 采用完全随机试验设计，应用温室盆栽试验方法，研究16个月生希蒙得木实生苗在不同土壤水分条件下的生物量分配。7个希蒙得木种源参加试验，用控制浇水的方法设7个水分梯度。结果表明：在水分胁迫下，与对照相比，7个种源的希蒙得木总生物量分别下降了2640%，3722%，3026%，2011%，2722%，3041%，3417%；地上部分生物量占总生物量的比例逐渐降低,地下部分生物量占总生物量的比例逐渐增加，变幅为164%，200%，231%，215%，185%，267%，214%；根冠比分别是对照的11068%，14754%，17196%，15236%，15229%，22611%，15276%。

     

    Abstract: The biomass allocation of 16monthold pot grown seedlings of Simmondsia chinensis under greenhouse conditions with artificially simulated drought stresses was studied with Thorough Random Experiment Design.Seven provenances of S.chinensis were individually treated with seven different levels of drought stress by controlled irrigation.The results were as follows: Compared to the control, the total seedling biomass of the seven provenances under the same drought stress dropped by 2640%, 3722%, 3026%, 2011%, 2722%, 3041% and 3417% respectively.With the development of drought stress, the ratio of aboveground biomass to the total biomass decreased whereas the ratio of underground biomass to the total biomass increased, the variance of the seven 7 provenances was 164%, 200%, 231%, 215%, 185%, 267% and 214% respectively.The ratio of root biomass to the aboveground biomass of the seven provenances under drought stress was individually 11068%, 14754%, 17196%, 15236%, 15229%, 22611% and 15276% of the control.

     

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