土壤外源重金属铬对亚麻形态学指标的影响

Effects of Flax'S Morphological Indexes by Cr Spiked in Soils

[目的]研究土壤外源重金属Cr对亚麻形态学指标的影响。[方法]利用盆栽试验的方法,设定0、25、50、125、250、500 mg/kg 6个浓度梯度,分别利用考种和分光光度法测定亚麻的形态学指标。[结果]较低浓度Cr处理对亚麻的分枝数影响不显著,高浓度Cr(≥125mg/kg)胁迫显著降低了亚麻的分枝数(P<0.05);Cr浓度的增加显著降低了亚麻的蒴果数(P<0.05);较低浓度的Cr胁迫能促进亚麻株高、叶片叶绿素浓度的增加,达到峰值后,随着Cr处理浓度的进一步增加,亚麻的株高和叶片叶绿素的浓度则呈现下降趋势。[结论]较低浓度的Cr胁迫处理在一定程度上能够促进亚麻的生长,而高浓度的Cr胁迫则抑制亚麻的生长。

[Objective] To study effects of flax＇s morphological indexes by Cr spiked in soils.[Method] The pot culture experiment method was adopted.Six concentration grads（0,25,50,125,250,500 mg/kg） were adopted to measure the flax＇s morphological indexes by species review and spectrophotometry.[Result] The effect of low concentrate Cr was insignificant.High concentrate Cr（≥125 mg/kg） significantly reduced flax＇s branching numbers（P0.05）.The increased concentration of Cr significantly reduced flax＇s capsule numbers（P0.05）.Low concentrations of Cr increased the stem length and the chlorophyll content.After the peak,the stem length and the chlorophyll content decreased when the concentrations of Cr increased.[Conclusion] Low concentrations of Cr accelerated the growth of flax,but high concentrations of Cr restrained it.