Zhu Y.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research |
Zhu Y.,University of Chinese Academy of Sciences |
Wei C.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research |
Feng R.,Agro Environmental Protection Institute |
And 2 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2011
This study was conducted to investigate the effects of three additives (red mud, apatite and selenite) on the growth and heavy metal uptake of soybeans grown in multiple heavy metal contaminated soils collected from the mining area in Shuikoushan, Hunan province, China The addition of red-mud (1%, 2% and 5%), apatite (1%, 2% and 5%) and selenite (0.1 and 1 mg·kg-1 Se) all significantly improved the growth of soybeans, especially when 1 mg·kg-1 Se was added, with an up to 145% increase of the fresh biomass and 39% increase of dry weight, as compared with the control. Without additives, the average concentrations of Pb and Cd in the aboveground parts of the soybean plants were 12.2 mg·kg-1 and 13.8 mg·kg-1, respectively, being much higher than those for normal terrestrial vascular plants; while concentrations of other heavy metals fell in normal ranges. The uptake of Pb and Cd in soybean were obviously inhibited by the above three additives. Additions of 0.1 mg·kg-1Se and 5% red mud were more efficient than that of apatite in decreasing Pb accumulation in the aboveground soybean tissues, with reductions of 67% and 72% compared to the control, respectively; 0.1 mg·kg-1 Se treatment had the highest efficiency in decreasing Cd accumulation in the aboveground parts of the soybean plants, with a drop of 89.7% as compared with the control. All three additives depressed the translocation factors of Cd, copper (Cu), Pb, and As, and bioaccumulation of Pb and Cd in soybean as well. Addition of additives significantly reduced the bioavailability of heavy metals in the soils. Treatment with 5% red mud was the most efficient, with bioavailable concentrations of Cd, Cu, Pb, Zn and As in the soils measured as 15.71%, 38.62%, 19.23%, 36.00%, 46.35% of those in the control, respectively. The results indicated that red mud and apatite might directly inhibit the uptake of heavy metals in soybean through reducing the bioavailability of heavy metals in the soils, whereas Se decreases the accumulations of heavy metals mainly via elemental antagonism. Consequently, additives of red mud, apatite and selenite could efficiently reduce the ecological and health risks generated from multiple heavy metal contaminated soils, with Se the preferred choice.
Liao S.,Agro Environmental Protection Institute |
Liao S.,Open Key Laboratory of Agro Environment and Agro Product Safety of Ministry of Agriculture |
Guo J.,Agro Environmental Protection Institute |
Guo J.,Open Key Laboratory of Agro Environment and Agro Product Safety of Ministry of Agriculture |
And 8 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2012
To investigate the effect of bacteria Burkholderia sp. D54 on Cs uptake by P. americana Linn. and A. crenentus L., a pot experiment with different concentrations of Cs was conducted. It was found that inoculation of Burkholderia sp. D54 on P. americana Linn. and A. crenentus L. enhanced total biomass of P. americana and A. crenentus by 19.8%~33.4% and 22.9%~76.6%, respectively. Shoot Cs concentration of P. americana and A. crenentus increased by 4.9%~22.4% and 8.1%~19.4%, while root Cs concentration increased by 6.8%~15.7% and 1.1%~10.8%, respectively. We also concluded that inoculated Burkholderia sp. D54, increased potassium uptake by two types of plants, enhanced net assimilation rate, stomatal conduction, transpiration and water use efficiency of photosynthesis of the two types of plants, increased the activity of antioxidant enzymes CAT, POD and SOD under Cs stress, and reduced plants MDA content in leaves.
Li Z.,Agro Environmental Protection Institute |
Li Z.,Open Key Laboratory of Agro environment and Agro product Safety of Ministry of Agriculture |
Tang S.,Agro Environmental Protection Institute |
Tang S.,Open Key Laboratory of Agro environment and Agro product Safety of Ministry of Agriculture |
And 6 more authors.
Journal of Hazardous Materials | Year: 2010
A pot experiment in six open-top chambers with two levels of CO2 and two multi-metal contaminated soils was conducted to investigate combined effects of elevated CO2 levels and metals (Cu and Cd) on rice. Elevated CO2 significantly increased the total dry weight biomass of six Chinese rice by 20-108 and 32-142% for low and high levels of contaminated soils, respectively. We observed dilution/little varied phenomena in grain Cu concentration in six rice varieties grown on both contaminated soils under elevated CO2. We found significantly higher Cd concentrations in the parts of three rice varieties under elevated CO2, but lower levels for the others. Two major conclusions can be drawn from our study: (1) rice varieties with significantly increased biomass and metal uptake under elevated CO2 exhibit greater potential for phytoextraction and (2) given expected global increases in CO2 concentration, CO2-induced accumulation of metals in rice might be a component contributing to the potential health risk in the future, with Cd being a more important threat to human health than Cu. © 2009 Elsevier B.V.