[Limiting factors of waste land revegetation in indigenous zinc smelting areas of western Guizhou].
With indigenous zinc smelting waste residue, contaminated soil and background soil as test substrates, a pot experiment was conducted to study the growth characteristics of Lolium perenne and Trifolium pretense on these substrates. The results showed that the major limiting factors of waste land revegetation in indigenous zinc smelting areas of western Guizhou were the salt-alkali stress and the lower contents of organic matter, total N, available N and total K. The heavy metals in waste residue had a high concentration, but their available forms only occupied a small proportion, with low toxicity to plant but having potential harmful risk. Contaminated soil had lower concentrations of heavy metals than waste residue, but its contained heavy metals were more in available form. The constraints of revegetation on contaminated soil were the toxicity of heavy metals and the low contents of available P and K. Mixing contaminated soil with zinc smelting waste residue could be one of the effective approaches for the substrate amendment in indigenous zinc smelting areas.
Lin
Wen-Jie
WJ
Key Laboratory of Ecological Forestry Engineering, Sichuan Agricultural University, Ya' an 625014, Sichuan, China. lwjzwc@163.com
Xiao
Tang-Fu
TF
Ao
Zi-Qiang
ZQ
Xing
Jun
J
Ma
Huan-Cheng
HC
Hu
Ting-Xing
TX
D001673:Biodegradation, Environmental; D002681:China; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis*; D052918:Environmental Restoration and Remediation / Q000379:methods; D019216:Metals, Heavy / Q000032:analysis*; D008906:Mining; D063245:Plant Development; D015032:Zinc / Q000032:analysis
D004785:Environmental Pollutants; D019216:Metals, Heavy; D015032:Zinc