Phytoremediation of petroleum hydrocarbon-contaminated saline-alkali soil by wild ornamental Iridaceae species.
As a green remediation technology, phytoremediation is becoming one of the most promising methods for treating petroleum hydrocarbons (PHCs)-contaminated soil. Pot culture experiments were conducted in this study to investigate phytoremediation potential of two representative Iridaceae species (Iris dichotoma Pall. and Iris lactea Pall.) in remediation of petroleum hydrocarbon-contaminated saline-alkali soil from the Dagang Oilfield in Tianjin, China. The results showed that I. lactea was more endurable to extremely high concentration of PHCs (about 40,000 mg/kg), with a relatively high degradation rate of 20.68%.The degradation rate of total petroleum hydrocarbons (TPHs) in soils contaminated with 10,000 and 20,000 mg/kg of PHCs was 30.79% and 19.36% by I. dichotoma, and 25.02% and 19.35% by I. lactea, respectively, which improved by 10-60% than the unplanted controls. The presence of I. dichotoma and I. lactea promoted degradation of PHCs fractions, among which saturates were more biodegradable than aromatics. Adaptive specialization was observed within the bacterial community. In conclusion, phytoremediation by I. dichotoma should be limited to soils contaminated with ≤20,000 mg/kg of PHCs, while I. lactea could be effectively applied to phytoremediation of contaminated soils by PHCs with at least 40,000 mg/kg.
a Key Laboratory of Pollution Processes and Environmental Criteria at Ministry of Education/Tianjin Key Laboratory of Environmental Remediation and Pollution Control , College of Environmental Science and Engineering, Nankai University , Tianjin , China.
Lijuan
L
Cheng
a Key Laboratory of Pollution Processes and Environmental Criteria at Ministry of Education/Tianjin Key Laboratory of Environmental Remediation and Pollution Control , College of Environmental Science and Engineering, Nankai University , Tianjin , China.
Yanan
Y
Wang
a Key Laboratory of Pollution Processes and Environmental Criteria at Ministry of Education/Tianjin Key Laboratory of Environmental Remediation and Pollution Control , College of Environmental Science and Engineering, Nankai University , Tianjin , China.
Zhang
Z
Cai
a Key Laboratory of Pollution Processes and Environmental Criteria at Ministry of Education/Tianjin Key Laboratory of Environmental Remediation and Pollution Control , College of Environmental Science and Engineering, Nankai University , Tianjin , China.
Jie
J
Liu
a Key Laboratory of Pollution Processes and Environmental Criteria at Ministry of Education/Tianjin Key Laboratory of Environmental Remediation and Pollution Control , College of Environmental Science and Engineering, Nankai University , Tianjin , China.
Binbin
B
Yu
a Key Laboratory of Pollution Processes and Environmental Criteria at Ministry of Education/Tianjin Key Laboratory of Environmental Remediation and Pollution Control , College of Environmental Science and Engineering, Nankai University , Tianjin , China.
Qixing
Q
Zhou
D000468:Alkalies / Q000032:analysis; D001673:Biodegradation, Environmental; D002681:China; D031323:Iris Plant / Q000378:metabolism*; D059392:Petroleum Pollution / Q000032:analysis*; D012965:Sodium Chloride / Q000032:analysis; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000378:metabolism*; D013045:Species Specificity
D000468:Alkalies; D012987:Soil; D012989:Soil Pollutants; D012965:Sodium Chloride
petroleum hydrocarbons (PHCs); rhizodegradation; rhizospheric microorganism; soil contamination; wild ornamental