欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

氯化钙对互花米草镉积累及胁迫的影响

何真真1,柴民伟1,魏远1,刘立民2,石福臣1**   

  1. (1南开大学生命科学学院, 天津 300071; 2天津港环保卫生管理中心, 天津 300071)
  • 出版日期:2013-06-10 发布日期:2013-06-10

Effects of CaCl2 on the Cd accumulation and stress of Spartina alterniflora.

HE Zhen-zhen1, CHAI Min-wei1, WEI Yuan1, LIU Li-min2, SHI Fu-chen1**   

  1. (1College of Life Sciences, Nankai University, Tianjin 300071, China; 2Environmental Health Management Center of Tianjin Port, Tianjin 300071, China)
  • Online:2013-06-10 Published:2013-06-10

摘要: 采用蛭石盆栽试验研究了低、中、高浓度CaCl2对互花米草Cd积累与胁迫的影响。结果表明,在200 μg·g-1 CdCl2浓度下,互花米草的株高、分蘖数、过氧化氢酶活性、地上和地下部分干重都有所降低,脯氨酸含量显著升高;在200 μg·g-1 CdCl2浓度下添加CaCl2以后,随着CaCl2浓度的增加,互花米草的株高、分蘖数、地上干重、地下干重和过氧化氢酶活性呈现先增长后降低的变化,说明一定的Ca浓度增加了互花米草耐受Cd的能力。与单独CdCl2胁迫相比,CaCl2的添加降低了互花米草脯氨酸含量,缓解了重金属Cd对互花米草的毒害作用。互花米草体内的Cd主要积累在地下部分,随着CaCl2浓度的增加,互花米草地上和地下部分Cd含量及转运系数均显著升高,说明CaCl2对Cd有一定的活化作用,能够提高互花米草对重金属Cd的吸收积累和向地上部分的转运能力。

关键词: 生态用地, 生态安全, 黑河中游, 距离阈值, 景观连接度

Abstract: A vermiculite pot culture experiment was conducted to study the effects of low, medium, and high concentrations of CaCl2 on the Cd accumulation and stress of Spartina alterniflora. At 200 μg·g-1 of CdCl2, the S. alterniflora plant height, tiller number, catalase activity, and shoot and root dry weights decreased somewhat, while the plant proline content increased significantly. With the supplement of increasing concentration of CaCl2, the plant height, tiller number, catalase activity, and shoot and root dry weights decreased after an initial increase, indicating that definite concentration of CaCl2 increased the Cd tolerance of S. alterniflora. As compared with CdCl2 stress alone, the supplement of CaCl2 decreased the plant proline content, suggesting the mitigation effect of CaCl2 on the toxic effect of Cd on S. alterniflora. The Cd was mainly accumulated in the underground part of S. alterniflora.  With the increasing concentration of supplemented CaCl2, the Cd concentration in the above and underground parts of S. alterniflora and the Cd transfer coefficient increased significantly, suggesting that CaCl2 had definite activation effect on Cd, and helped to increase the capability of S. alterniflora in absorbing Cd and transporting the Cd to the plant aboveground part.

Key words: landscape connectivity, distance threshold, ecological security, the middle reaches of the Heihe River., ecological land