石灰、活性炭对镉污染土壤的修复效果研究
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Effects of lime and activated carbon on remedying chromium contaminated soil
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    摘要:

    通过模拟镉(Cr,0~300 mg kg-1)污染土壤盆栽试验,研究石灰、活性炭及石灰+活性炭对镉胁迫下小白菜生长状况的影响及对镉污染土壤的修复效果。结果表明:受镉污染的土壤明显使小白菜受到毒害, 但经石灰(L1、L2)、活性炭(C2、C3)及石灰+活性炭(L1C1、L2C2)处理均缓解了重金属的毒害症状,显著促进小白菜的生长,生物量较对照提高1倍~2倍(( p<0.05)。3种改良剂相比,在相同Cr浓度处理下,活性炭对降低污染土壤中有效态镉的效果最好,与CK相比,有效态镉的含量降低至0.086 mg kg-1,降幅达77.36%。相关分析表明:小白菜叶部镉含量和根部镉含量与土壤有效态镉含量表现出显著的正相关( p<0.01),土壤pH与土壤有效态镉含量之间呈负相关( p<0.05),所以在镉污染的土壤中,可以提高土壤的pH,以减小土壤镉的植物有效性,使其向植物迁移的风险减小。

    Abstract:

    Effects of soil amendments, including lime,activated carbon and lime-activated carbon, remedying Cr contaminated soil were studied and compared in a pot experiment growing pakchoi. Results show that the vegetable was chronically affected by Cr added into the soil, but this adverse effect could be counteracted by applying soil amendments, As a result, fresh weight of the plant increased. The addition of the soil amendments also significantly reduced Cr availability in the soil. Comparison revealed that among the three soil amendments, activated carbon was the best in the soil as compared with the use of other two. Therefore, activated carbon is highly recommended as a soil amendment remedying Cr contaminated soils.

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杨林,陈志明,刘元鹏,王玉军.石灰、活性炭对镉污染土壤的修复效果研究[J].土壤学报,2012,49(3):518-525. DOI:10.11766/trxb201103090082 Yang Lin, Chen Zhiming, Liu Yuanpeng, Wang Yujun. Effects of lime and activated carbon on remedying chromium contaminated soil[J]. Acta Pedologica Sinica,2012,49(3):518-525.

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历史
  • 收稿日期:2011-03-09
  • 最后修改日期:2011-10-27
  • 录用日期:2011-10-31
  • 在线发布日期: 2012-02-27
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