玉米(Zea mays L.)在铜污染土壤中的植物修复能力和铜吸收

Ali Daryabeigi Zand, Karl H. Mühling
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引用次数: 4

摘要

铜是世界范围内常用的重金属,是包括植物在内的大多数生物必需的微量营养素。然而,土壤中铜含量过高可能会对植物的生长和存活产生不利影响。继续向土壤中引入铜,例如通过过度使用农用化学品,在全世界引起了严重的环境问题。多种植物具有通过不同机制清除土壤污染物的能力;然而,关于玉米(Zea mays L.)的植物修复潜力及其在含铜土壤中的吸收和积累潜力的报道有限。研究了土壤添加0、50、100、200和300 mg kg - 1铜对柽柳生长参数、根、梢对土壤铜的吸收和积累以及柽柳植物修复潜力的影响。采用原子吸收分光光度法测定了土壤和植物样品中的铜含量。添加50 mg kg−1 Cu刺激了Z. mays的生长参数,而较高Cu含量则表现出抑制植物生长的作用。结果表明,在不同处理下,根的Cu积累量均显著高于茎,表明紫苏修复铜污染土壤的植物稳定机制占主导地位。但随着土壤中铜含量的增加,铜从根部向地上部分的转运有一定程度的增强。在200 mg kg - 1铜处理的土壤中,青梅的铜累积量最大,为5210µg /盆。结果表明,青霉对低、中度铜污染土壤具有良好的修复作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Phytoremediation Capability and Copper Uptake of Maize (Zea mays L.) in Copper Contaminated Soils
Copper is a frequently used heavy metal worldwide and known to be an essential micronutrient for most living organisms including plants. However, excessive levels of copper in soil may adversely affect plant growth and survival. The continuing introduction of copper to soil, e.g., through excessive utilization of agrochemicals has raised serious environmental concerns throughout the world. A variety of plants have the capability to eliminate pollutants from soil through different mechanisms; however, limited information is reported on phytoremediation potential of maize (Zea mays L.) and its uptake and the accumulation potential in copper-containing soils. The effects of additions of 0, 50, 100, 200 and 300 mg kg−1 of copper to soil on growth parameters of Z. mays, copper uptake from soil and accumulation in roots and shoots, and phytoremediation potential of Z. mays were investigated in this research. Copper content in soil and plant samples were determined using atomic absorption spectrophotometry. The addition of 50 mg kg−1 Cu stimulated Z. mays growth parameters, while higher content of Cu exhibited inhibitory effects of plant growth. Results indicated that roots accumulated significantly higher levels of Cu than shoots in all treatments, suggesting dominancy of phytostabilization mechanism in remediation of Cu-polluted soil by Z. mays. However, translocation of Cu from the roots to the aerial parts enhanced to some extent with copper level in soil. The greatest Cu accumulation capacity of 5210 µg per pot was gained in Z. mays cultivated in soil treated with 200 mg kg−1 copper. Results demonstrated that Z. mays can promisingly remediate low to moderately copper-contaminated soils.
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