期刊
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
卷 16, 期 5, 页码 496-508出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/15226514.2013.798617
关键词
clay minerals; organic materials; heavy metals; sorption constants; Zea mays; Sedum alfredii
资金
- Natural Science Foundation of China [4107136]
- Guangdong Province [S2011030002882]
- Science and Technology Project of Guangdong Province [2010B03180006, 2012A030700003]
In order to select appropriate amendments for cropping hyperaccumulator or normal plants on contaminated soils and establish the relationship between Cd sorption characteristics of soil amendments and their capacity to reduce Cd uptake by plants, batch sorption experiments with 11 different clay minerals and organic materials and a pot experiment with the same amendments were carried out. The pot experiment was conducted with Sedum alfredii and maize (Zea mays) in a co-cropping system. The results showed that the highest sorption amount was by montmorillonite at 40.82mg/g, while mica was the lowest at only 1.83mg/g. There was a significant negative correlation between the n value of Freundlich equation and Cd uptake by plants, and between the logarithm of the stability constant K of the Langmuir equation and plant uptake. Humic acids (HAs) and mushroom manure increased Cd uptake by S. alfredii,but not maize, thus they are suitable as soil amendments for the co-cropping S. alfredii and maize. The stability constant K in these cases was 0.14-0.16 L/mg and n values were 1.51-2.19. The alkaline zeolite and mica had the best fixation abilities and significantly decreased Cd uptake by the both plants, with K 1.49 L/mg and n 3.59.
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