不同品种紫花苜蓿对镍的吸收累积特性研究

Study on the absorption and accumulation of nickel in five alfalfa cultivars

本文以紫花苜蓿的5个品种北极熊、三得利、W1319、超人、前景为供试植物,在含有不同浓度镍的水溶液中进行水培实验,比较5个品种对Ni的吸收、转运和富集特性。结果表明:随着Ni处理浓度的增加,Ni对三得利、W1319和北极熊品种的生长发育表现为先促进后抑制,对超人和前景品种的生长发育表现为抑制;5个紫花苜蓿品种根部富集能力都远强于茎叶的富集能力;5个紫花苜蓿品种对Ni的转运系数均未超过1,说明紫花苜蓿根部向上转运能力Ni的能力低于超富集植物。在Ni处理浓度为1μg/ml、3μg/ml、9μg/ml时,茎叶及根部积累量最高的品种分别为三得利、北极熊和前景;Ni处理浓度为6μg/ml时,茎叶和根部对Ni的积累量最多的品种分别为超人和前景。本实验可为植物吸收治理土壤中重金属元素镍提供科学依据。

In this study,nickel accumulation by five alfalfa cultivars(polar bear,suntory,W1319,superman and foreground)was compared in hydroponic cultures with different Ni concentrations.The results showed that with the increase of Ni treatment concentration,Ni promoted the growth and development of Suntory,W1319 and Polar Bear first,then inhibited,and inhibited the growth of Superman and Prospect.The Ni enrichment ability of the five alfalfa varieties,roots was far stronger than that of stem and leaf.None of the five alfalfa varieties had a Ni transfer coefficient of more than 1,indicating that the alfalfa root's ability to transport Ni upwards was lower than that of super-enriched plants.At the Ni treatment concentrations of 1μg/ml,3μg/ml,and 9μg/ml,Suntory,Polar Bear and Prospect had the highest accumulation of Ni in stems,leaves and roots.When the treatment concentration of Ni treatment was 6μg/ml,Superman and Prospect had the most accumulation of Ni in stems,leaves and roots.This experiment can provide a scientific basis for plants to absorb and control the heavy metal element nickel in soil.