不同品种红麻在重度与轻微镉污染耕地的修复试验

为明确不同品种红麻在不同镉（Cd）污染程度耕地中的修复能力，以7种红麻在重度与轻微Cd污染耕地中进行植物修复对比试验，对红麻各部位Cd的累积量、富集系数、转运系数、生长指标、相应土壤Cd变化量进行了测定，并计算了试验总变异来源及各品种回归系数。结果表明： 7种红麻均能在Cd污染耕地中正常生长，在重度污染耕地中的Cd移除量为72.49~149.17 g·hm^-2，在轻微污染耕地中的Cd移除量为25.95~49.91 g·hm^-2。红麻各部位Cd的富集能力排序为：叶 > 根 > 茎，转移能力排序为：叶 > 茎。重度Cd污染下，红麻各部位富集系数为1.11~8.83，转移系数为0.32~4.25；轻微Cd污染下，红麻各部位富集系数为2.08~14.63，转移系数为0.38~2.92。所有红麻的回归系数均小于1，稳定性都较高。研究表明： 7种红麻都具较好的生物产量及Cd富集与转移机制，均可用于Cd污染耕地修复，其中中红麻13号可用于重度Cd污染耕地修复，中红麻13号与中杂红328号可用于轻微Cd污染耕地修复。

Comparative repair test of different varieties of kenaf in heavily and lightly cadmium-contaminated farmland

The aim of this study is to determine the repair ability of different varieties of kenaf in farmland containing different levels of cadmium(Cd)pollution. A phytoremediation experiment with seven types of kenaf in heavily and lightly Cd-contaminated farmland was undertaken to determine the Cd accumulation and enrichment, transfer coefficients, physiological signs of various parts of kenaf, and relevant soil changes. The source of the total variation in the experiment and the regression coefficient of each variety were calculated. The results showed that all kenaf grew well in Cd-contaminated farmland and Cd removal in kenaf in the heavily Cd-contaminated farmland was 72.49~149.17 g·hm^-2 and in the lightly polluted farmland was 25.95~49.91 g·hm^-2. The enrichment ability of Cd in different parts of kenaf was leaves > roots > stems and the transfer ability of Cd was leaves>stems. In heavily Cd-contaminated farmland, the Cd enrichment coefficients of kenaf ranged from 1.11 to 8.83 and the transfer coefficients ranged from 0.32 to 4.25. In the lightly Cd-contaminated farmland, the Cd enrichment coefficients of kenaf ranged from 2.08 to 14.63 and the transfer coefficients ranged from 0.38 to 2.92. The regression coefficients of the different varieties of kenaf were less than 1 and the stability was high. The study shows that all seven types of kenaf have good biological yield and Cd enrichment and transfer mechanism for restoring Cd-contaminated farmland. Among them, China kenaf No.13 is recommended for the restoration of heavily Cd-contaminated farmland, whereas China kenaf No.13 and China hybrid kenaf No.328 are recommended for the restoration of lightly Cd-contaminated farmland.