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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。
The scientific selection of ecological restoration plants in mining abandoned land in arid area is the precondition of ecological management. In this paper, Caragana korshinskii Kom, the dominant species in ecological restoration of arid regions, was studied to study the effects of Ni2 + and Cu2 + on seed germination characteristics under different concentrations, with a view to the ecological restoration of mining-contaminated soils and heavy metal contaminated soils Provide a scientific basis. The results showed that under the stress of Ni2 + or Cu2 +, the germination rate, germination energy, germination index and vigor index of Caragana korshinskii seedlings all had different response characteristics. However, the effect of seedling germination was not obvious or even promoted when the concentration of Ni2 + or Cu2 + Germination of Caragana korshinskii seed germination was faster and its germination rate was higher at 20 mg / L or Cu2 + concentration of 50 mg / L, which was beneficial to the accumulation of dry matter; The effect is higher than Cu2 +; Ni2 + and Cu2 + have inhibitory effect on radicle growth and gradually increase with the increase of concentration.