Enrichment of heavy metals in Saccharum arundinaceum ( Retz.) Jeswiet in different soil habitats
Metal ores mining and processing have caused serious pollution of different environmental compartments, and the soil heavy metal contamination around mining areas is of great concern because of its potential health risk to the local inhabitants. In order to screen the phyto-accumulators of heavy metals, an investigation was conducted on the enrichment of heavy metals (Cu, Zn, Pb and Cd) by the dominant species Saccharum arundinaceum (Retz. ) Jeswiet growing on the different soil habitats in the vicinity of Dabaoshan copper ore mine, Ruyuan tungsten mine, and Renhua lead and zinc mine in Guangdong Province of South China, taking the Ruyuan non-polluted site as the control. By means of field sampling and chemical analysis, the concentrations of Cu, Zn, Pb and Cd in S. Arundinaceum and soil were determined. The results showed that S. Arundinaceum had the advantages in accumulating Cu, Zn, Pb and Cd, especially Cu. There was a significant correlation between the Cu concentrations in the sampling soils and sampling S. Arundinaceum shoots *( P<0. 05) , and between the enrichment and transportation of Pb and Cd by S. Arundinaceum (P<0. 01). In strong acidic and multi-metals contaminated soil environment, S. Arundinaceum was featured with high enrichment capacity, which reflected the characteristics of S. Arundinaceum as a Cu hyperaccumulator, and the enrichment factor and transport coefficients of Zn, Pb' and Cd were greater than 1. For the S. Arundinaceum growing on the abandoned farmland in which the concentrations of soil Cd, Cu, Pb and Zn were below the National Soil Environmental Quality Standards of Grade II ( GB 15618-1995) , the enrichmentimplied the enhancement of the physical and chemical protection of SOC, which could benefit the accumulation of SOC and act as an important factor sustaining the higher carbon sequestration rates in paddy soils.
国家科技期刊平台
NSTL
万方数据
维普
