Liu D.,South China Agricultural University |
Zheng J.,South China Agricultural University |
Zhao T.,South China Agricultural University |
Jiang C.,South China Agricultural University |
Jiang C.,Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong Higher Education Institutes
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015
This study aimed to investigate the effects of different P concentrations (0~45.52 mg·L-1) with KH2PO4 supply and a fixed P concentration of 22.76 mg·L-1 with Ca3(PO4)2 supply on the growth and heavy metal uptake of Zn/Cd hyperaccumulator Sedum alfredii, Zn/Cd/Ni hyperaccumulator Noccaea caerulescens (two species) and Ni hyperaccumulator Alyssum murale under the concentrations of 20 mg·L-1(Zn), 18 mg·L-1(Ni), 10 mg·L-1(Pb) and 0.5 mg·L-1(Cd) by hydroponic experiment. The results showed that the growth of all four hyperaccumulators were inhibited with P deficiency treatments including the control and 22.76 mg·L-1 treatment supplied with Ca3(PO4)2. However, there were no significant difference for the shoot biomass of four hyperaccumulators among the 11.38, 22.76 and 45.52 mg·L-1 treatments. Zn and Cd accumulation in S. alfredii and Zn, Cd and Ni accumulation in No 1 N. caerulescens reached the maximum with 22.76 mg·L-1 treatment (P concentration in normal nutrient solution), and significantly decreased with high P concentration of 45.52 mg·L-1. Ni, Cd and Pb accumulation in A. murale reached the maximum with 45.52 mg·L-1 treatment, and the accumulation of Ni, Zn, Cd and Pb in No 1 N. caerulescens was different with different P concentrations. The optimal P level for the most metal accumulation in hyperaccumulators differed with plant categories. ©, 2015, Science Press. All right reserved.
Tang J.,South China Agricultural University |
Tang J.,Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong Higher Education Institutes |
Liu X.,South China Agricultural University |
Liu X.,The Pearl River Water Environment Monitoring Center |
And 9 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2014
The concentrations of organochlorine pesticides (OCPs) in water samples (n=18) collected from different sites of Liuxi River were determined using GC-MSD, and the Species Sensitivity Distributions (SSD) of different freshwater organisms exposed to OCPs was established. Based on OCP concentrations and SSD, the hazardous concentration for 5% the species (HC5) of OCPs to freshwater organisms were estimated, and the potential affected fractions (PAF) of various OCPs concentrations to freshwater organisms were also predicted. In addition, the ecological risk of OCPs in Liuxi River was assessed using quotient probability distribution. The results showed that the total concentrations of OCPs ranged from 216.41 to 389.70 ng·L-1 with a mean value of 293.02 ng·L-1. The HC5 value of α-Benzenehexachloride was very high (12.95 μg·L-1), while the HC5 values of Endosulfan sulfate and p, p'-DDD to freshwater organisms were below 0.10 μg·L-1, which might have large effects on ecological system. When the OCP concentration was 0.50 μg·L-1, the ecological risks of nine OCP compounds (except for α-BHC and Heptachlor) exceeded the 5% threshold. The quotient probability distribution showed that all the OCP compounds (expect for EndosulfanII) have potential ecological risks. Endosulfan sulfate posed the highest risk when 95% species were not affected at 95% confidential level.