中文关键词盐分胁迫八宝景天生态型镉积累耐盐性 英文关键词salt stressHylotelephium spectabilepopulationsCd accumulationsalt tolerance

作者	单位	E-mail
郭俊娒	中国科学院地理科学与资源研究所环境修复中心, 北京 100101 中国科学院大学, 北京 100049	gjm19900321@163.com
杨俊兴	中国科学院地理科学与资源研究所环境修复中心, 北京 100101 中国科学院大学, 北京 100049	yangajx@igsnrr.ac.cn
杨军	中国科学院地理科学与资源研究所环境修复中心, 北京 100101 中国科学院大学, 北京 100049
万小铭	中国科学院地理科学与资源研究所环境修复中心, 北京 100101 中国科学院大学, 北京 100049
孟晓飞	中国科学院地理科学与资源研究所环境修复中心, 北京 100101 中国科学院大学, 北京 100049
陈同斌	中国科学院地理科学与资源研究所环境修复中心, 北京 100101 中国科学院大学, 北京 100049
何孟轲	中国科学院地理科学与资源研究所环境修复中心, 北京 100101 中国科学院大学, 北京 100049 中国农业大学资源与环境学院, 北京 100083
周小勇	北京瑞美德环境修复有限公司, 北京 100015
徐铁兵	河北省环境科学研究院, 石家庄 050051

中文摘要 采用Cd含量为2.22 mg·kg^-1的潮褐土开展盆栽试验，通过外源添加NaCl研究不同生态型八宝景天对Cd和盐分复合胁迫的生长响应以及Cd吸收积累的差异.结果表明，在Cd单一或与盐分复合胁迫下，八宝景天各生态型间地上部生物量和Cd含量均表现出显著差异，盐分胁迫进一步加剧了八宝景天的生长抑制，高盐胁迫下八宝景天各生态型地上部Cd含量总体呈下降趋势，这与盐分引起土壤pH显著升高导致Cd生物有效性降低有关.此外，不同生态型对盐分胁迫表现出的生长和Cd吸收响应有显著差异，LN生态型地上部生物量在各处理下均显著高于其他生态型，且在1% NaCl处理下生物量仍没有显著下降，耐性指数可达0.91.同时，其地上部Cd含量在不同处理下均显著高于其他生态型，其原因为LN生态型在Cd富集和解毒的生理机制方面更具优势，而这些同样是其耐盐性的重要生理机制.综上可知，尽管盐分胁迫减少了八宝景天地上部Cd富集量，但其不同生态型间差异显著，LN生态型在2% NaCl处理下地上部Cd富集量仍可达84.4 μg·plant^-1，且较其他生态型显著提高48.4%~89.3%，因此，LN生态型八宝景天具有应用于修复盐渍化土壤Cd污染的潜力. 英文摘要 A pot experiment was conducted to investigate the growth response and Cd accumulation characteristics among different populations of Hylotelephium spectabile in Cd-contaminated cinnamon soil (2.22 mg·kg^-1) with the addition of different concentrations of NaCl. Results showed that the biomasses and Cd concentrations of H. spectabile showed significant differences among different populations under Cd alone or Cd-salt combined stress. Moreover, salt stress aggravated the growth inhibition of H. spectabile and the Cd concentrations in different H. spectabile populations showed a declining trend, which may be related to the salt-derived pH increase leading to a decrease in Cd bioavailability. In addition, the growth and Cd absorption responses of H. spectabile under salt stress were significantly different in the different populations. The shoot biomasses of the LN population were significantly higher than in other populations under different treatment, and showed no significant decrease with the addition of 1% NaCl when compared with the control treatment and the tolerance index remained 0.91. At the same time, the shoot Cd concentration of the LN population was significantly higher than in other populations under different treatments. The result may be attributed to the Cd accumulation and detoxification mechanisms in LN are prior than other populations that may also have important physiological mechanisms for tolerance of salt stress. In summary, although Cd uptake in H. spectabile decreased with salt stress, there were significant differences among different populations. LN populations accumulated 84.4 μg·plant^-1 Cd in shoots with 2% NaCl addition, which was 48.4%-89.3% higher than in other populations. Therefore, H. spectabile, especially LN populations, is a good candidate for phytoremediation of Cd-contaminated saline soil.

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