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生态学杂志 ›› 2010, Vol. 29 ›› Issue (10): 1998-2002.

• 研究报告 • 上一篇    下一篇

添加硫代硫酸铵对植物修复汞污染土壤的影响

王建旭1,2,冯新斌1**,商立海1,包正铎1,2,仇广乐1   

  1. 1中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳 550002;2中国科学院研究生院,北京 100049
  • 出版日期:2010-10-08 发布日期:2010-10-08

Effects of ammonium thiosulphate amendment on phytoremediation of mercury-polluted soil.

WANG Jian-xu1,2, FENG Xin-bin1, SHANG Li-hai1, BAO Zheng-duo1,2, QIU Guang-le1
  

  1. 1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China|2Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Online:2010-10-08 Published:2010-10-08

摘要: 由于汞污染土壤中汞的生物有效性非常低,限制了植物修复技术的应用。本试验通过室内盆栽模拟试验,研究了硫代硫酸铵添加到土壤后,对土壤中汞的生物有效性、印度芥菜生物量及其吸收土壤中汞的影响。结果表明,当硫代硫酸铵与土壤比例为1∶12.5(W/W)时,土壤中生物有效态汞含量最高,达0.51 mg·kg-1,是对照的12.7倍。土壤中加入2 g·kg-1硫代硫酸铵时,印度芥菜根、茎和叶片干重分别增加了0.23、0.98和1.22 g,且印度芥菜根系、茎和叶片的总汞含量分别达到1.96、0.43和3.35 mg·kg-1,是对照组的8、4和2倍。添加硫代硫酸铵后,土壤渗滤液中汞浓度增加,最高达2487 ng·L-1。因此,添加硫代硫酸铵能提高汞污染土壤植物修复效率,但也能在一定条件下导致汞向地下流失。

关键词: 营养源, 稻虱缨小蜂, 寿命, 寄生能力, 存活率

Abstract: The low bioavailability of mercury (Hg) in Hg-polluted soil limits the application of phytoremediation. In this paper, a greenhouse pot experiment was conducted to study the effects of ammonium thiosulphate amendment on the Hg-bioavailability in soil, the Indian mustard biomass, and the Hg uptake by the plant. When the amended ammonium thosulphate was 1/12.5 of soil (W/W), the concentration of soil bioavailable Hg was the highest (0.51 mg·kg-1), 12.7 times of the control. When the ammonium thosulphate was amended at a rate of 2 g·kg-1, the dry weight of mustard root, stem, and leaf increased by 0.23, 0.98, and 1.22 g, and the Hg concentration in the root, stem and leaf was 1.96, 0.43, and 3.35 mg·kg-1, being 8, 4, and 2 times of the control, respectively. Amendment of ammonium thiosulphate increased the leachate Hg concentration, with the maximum as high as 2487 ng·L-1. Therefore, the amendment of ammonium thiosulphate to Hg-contaminated soil could increase the efficiency of phytoremediation, but on certain conditions, could also cause Hg-leaching into underground.

Key words: Nutritional resource, Anagrus nilaparvatae, Longevity, Parasitic ability, Survival rate