| 秋茄对镉的吸收、积累及净化作用的研究 |
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| 引用本文： | 郑逢中,林鹏,郑文教,庄峙厦. 秋茄对镉的吸收、积累及净化作用的研究[J]. 植物生态学报, 1992, 16(3): 220-226 |
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| 作者姓名： | 郑逢中 林鹏 郑文教 庄峙厦 |
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| 作者单位： | 厦门大学环境科学研究所，厦门大学环境科学研究所，厦门大学环境科学研究所，在厦门大学分析测试中心 厦门 361005，厦门 361005，厦门 361005 |
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| 摘 要： | 采用砂培研究红树植物秋茄幼苗在含镉0.0025—25ppm海水培养液中对镉的吸收积累、净化作用以及镉对秋茄的毒害作用。试验结果表明：秋茄植物体镉含量大小顺序为：根>胚轴>茎>叶．各器官镉含量(y)随培养液镉浓度(x)的增加而增加，两者呈显著的双对数线性正相关，根与培养液镉含量的回归方程为；logy=1.8039+0.4311logx。在含镉培养液中培养4个星期，不同器官对镉的富集作用明显，镉处理2.5ppb，叶、茎、胚轴、根的富集系数分别为62.4、113.6、187.2、705.2．吸收的镉主要积累于根部。25ppm镉处理组每株幼苗(干重6.18g)吸收镉量为239.47μg，其中根占植物体总镉量的75.6%．在所有浓度处理中，秋茄植物体对镉的吸收量为培养液总加镉量的2.4—36%。2.5ppm镉处理组10个星期内，根部镉积累量为538.74μg／g，未见明显受害，表明秋茄对镉的吸收积累能力和耐性都较强。幼苗受镉的毒害程度主要与根部镉含量有关。从天然条件生长的红树植物器官镉积累量来看，也表明秋茄群落对镉污染的吸收净化效果显著。
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| 关 键 词： | 红树植物 镉 净化作用 耐性 |
STUDY ON THE ABSORPTION AND REMOVAL OF KANDELIA CANDEL FOR POLLUTANT CADMIUM |
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| Zheng Feng-zhong Lin peng Zheng Wen-jiao Zhuang Zhi-xia. STUDY ON THE ABSORPTION AND REMOVAL OF KANDELIA CANDEL FOR POLLUTANT CADMIUM[J]. Acta Phytoecologica Sinica, 1992, 16(3): 220-226 |
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| Authors: | Zheng Feng-zhong Lin peng Zheng Wen-jiao Zhuang Zhi-xia |
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| Abstract: | Seedlings of mangrove plant, Kandelia candek, were growed in sea water with 0.0025-25ppm Cd in sand culture. The main results showed as follows: The Cd contents in the different organs were: root>hypocotyl>stem>leaf. The Cd contents in the organs (y) increased with the increasing of Cd concentrations in the culture solution (x) and relationship between y and x was doubly logarithmic regression equation, eig., the equation of root Cd content and that of culture solution was: log(y) = 1. 8039 + 0.4311 log(x) showing a greatly significant relation. The Cd enrichment ratios in different organs of the seedling were 62.4 for leaf, 113.6 for stem, 187.2 for hypocotyl, 705.2 for root respectively in the solution treated with 2.5ppb. The amount of Cd accumulated was 239.47μg per seedling(mean d. w. 6.18g) treated with 25ppm for 4 weeks and 75.6% of which was in the roots. 2.4--36% of Cd added to culture solution were absorbed by the seedlings in all treated groups for 4 weeks. The Cd content in the root treated with 2.5ppm Cd for 10 weeks was 538.74μg/g but the seedlings had not been injured apparently, so that K candel could play an important role in absorption and removal of Cd from the soil of coastal swamp. |
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| Keywords: | Mangrove Cadmium Absorption Tolerance |
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