Ni~(2+)、Cu~(2+)胁迫对柠条种子萌发特征的影响

干旱区矿业废弃地生态修复植物的科学选择是生态治理的前提。文中以干旱区生态恢复的优势植物柠条(Caragana korshinskii Kom)为研究对象,研究了Ni2+、Cu2+在不同浓度条件下对其种子萌发特征的影响,以期为矿业废弃地及重金属污染土壤的生态修复提供科学依据。结果表明:在Ni2+或Cu2+胁迫条件下,柠条种子的发芽率、发芽势、发芽指数及活力指数都有不同的响应特征,低浓度时对种子萌发影响不明显,甚至有促进作用,当Ni2+浓度为20mg/L或Cu2+浓度为50mg/L时柠条种子的萌发较快,发芽率相对较高,且有利于干物质的积累;高浓度时则有较强的抑制作用,其中Ni2+的抑制作用要高于Cu2+;Ni2+和Cu2+对胚根的生长均具有抑制作用并随着浓度的升高而逐渐增强。

Effects of nickel and copper ions stress on seed germination features of Caragana korshinskii

Scientific selection of ecological restoration of mining wastelands in arid areas is the premise of ecological management.The research respectively studied the effect of different concentration of nickel and copper ions on the germination features of Caragana Korshinskii Kom,which provides evidence for the soil ecological restoration in the tail mining area and heavy metal pollution area.The results showed that under the stress of Cu2+ and Ni2+,the germination percentage,germinating viability,germination index and vitality index of the seeds of Caragana Korshinskii were impacted in different extent.The seed germination was not influenced significantly in the low concentration of Cu2+or Ni2+ solution,when it at the 20mg·L-1 Ni2+or 50mg·L-1 Cu2+,the seeds of Caragana Korshinskii germinated faster and the germination rate was relatively higher and also better to accumulate dry matter;Inhibiting effects of the Nickel ion were higher than that of Copper ion when it was inhibited in the high concentrations.The growth of radicles were all inhibited in different concentration of Cu2+or Ni2+ solution,and with the increase of the concentration,the inhibition effects gradually strengthened.