欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志 ›› 2011, Vol. 30 ›› Issue (06): 1222-1228.

• 研究报告 • 上一篇    下一篇

馒头柳对镉的耐性、运输途径和累积特征

吴海燕1,2,台培东1**,李培军1,方英1,2,秦秦1,2,杨辉3,王善仙1,2,詹振楠1,2   

  1. 1中国科学院沈阳应用生态研究所污染生态与环境工程重点实验室, 沈阳 110016;2中国科学院研究生院, 北京 100049;3吉林师范大学, 吉林四平 136000
  • 出版日期:2011-06-08 发布日期:2011-06-08

Cadmium tolerance of and cadmium transportation and accumulation in Salix matsudana.

WU Hai-yan1,2, TAI Pei-dong1**, LI Pei-jun1, FANG Ying1,2, QIN Qin1,2, YANG Hui3, WANG Shan-xian1,2, ZHAN Zhen-nan1,2   

  1. 1Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3Jilin Normal University, Siping 136000, China
  • Online:2011-06-08 Published:2011-06-08

摘要: 采用液体培养法研究了馒头柳对镉的耐性、运输过程及富集特征,结果表明:馒头柳具有较强的耐镉特性,水培营养液中镉浓度为0.2 mg·L-1时,镉对柳的生长仍有促进作用;镉从根到地上部的长距离运输具有明显的韧皮部运输特征,表现为植株顶部组织镉含量显著高于底部(P<0.05),韧皮部高于木质部(14倍);馒头柳地上部对镉有非常强的持续富集能力;地上部富集的镉占植株吸收总镉量的52%~62%,且主要集中在叶片,只要秋季清除地表落叶,即可达到清除土壤镉的目的;因此,馒头柳适宜用作镉污染土壤的修复。

关键词: 溶解性有机质, 提取方法, 来源, 组成, 生物有效性, 环境意义

Abstract: A hydroponic experiment was conducted to investigate the cadmium (Cd) tolerance of and the Cd transportation and accumulation in Salix matsudana. S. matsudana showed a relatively higher tolerance to Cd. Its growth was promoted by Cd when Cd concentration in the medium was 0.2 mg·L-1. Phloem played an important role in the long distance Cd transportation from root to shoot. The top tissues of the plant had significantly higher Cd concentration (P<0.05) than the bottom tissues, and phloem had 14 times higher Cd concentration than xylem. Shoot had strong sustainable capability in accumulating Cd. The accumulated Cd in aboveground part, especially in leaves, accounted for 52%-62% of the total. Consequently, through cleaning out the fallen leaves of S. matsudana during its defoliation stage, soil Cd could be removed. S. matsudana would be a suitable plant for the phytoremediation of Cd-polluted soil.

Key words: Dissolved organic matter, Extraction method, Origin, Composition, Bioavailability, Environmental significance