Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Petroleum Resources, Gansu, Lanzhou, 730000, China.
J Environ Manage. 2023 Aug 1;339:117928. doi: 10.1016/j.jenvman.2023.117928. Epub 2023 Apr 14.
Phytoremediation of total petroleum hydrocarbons (TPHs) contamination is a process that uses the synergistic action of plants and rhizosphere microorganisms to degrade, absorb and stabilize pollutants in the soil, and has received increasing attention in recent years. However, this technology still has some challenges under certain conditions (e.g., highly alkaline and saline environments). The present study was selected three native plant species (alfalfa, tall fescue, and ryegrass) to remediate petroleum pollutants in greenhouse pot experiments. The results indicate that TPH contamination not only inhibited plant growth, soil chemical properties and soil fertility (i.e. lower plant biomass, chlorophyll, pH, and electrical conductivity), but also increased the malondialdehyde, glutathione, and antioxidant enzyme activities (catalase and polyphenol oxidase). Further, correlation analysis results illustrated that TPH removal was strongly positively correlated with chlorophyll, soil fertility, and total organic carbon, but was negatively correlated with dehydrogenase, polyphenol oxidase, pH, and electrical conductivity. The highest TPHs removal rate (74.13%) was exhibited by alfalfa, followed by tall fescue (61.79%) and ryegrass (57.28%). The degradation rates of short-chain alkanes and low rings polycyclic aromatic hydrocarbons (PAHs) were substantially higher than those of long-chain alkanes and high rings PAHs. The findings of this study provide valuable insights into petroleum decontamination strategies in the highly saline - alkali environments.
利用植物和根际微生物的协同作用来降解、吸收和稳定土壤中的污染物的植物修复技术，近年来受到了越来越多的关注。然而，在某些条件下（如高碱性和高盐环境），该技术仍存在一些挑战。本研究选择三种本地植物物种（紫花苜蓿、高羊茅和黑麦草）在温室盆栽实验中修复石油污染物。结果表明，石油污染不仅抑制了植物的生长、土壤的化学性质和土壤肥力（即植物生物量、叶绿素、pH 值和电导率降低），还增加了丙二醛、谷胱甘肽和抗氧化酶活性（过氧化氢酶和多酚氧化酶）。进一步的相关性分析结果表明，TPH 的去除与叶绿素、土壤肥力和总有机碳呈强烈正相关，而与脱氢酶、多酚氧化酶、pH 值和电导率呈负相关。紫花苜蓿对 TPHs 的去除率最高（74.13%），其次是高羊茅（61.79%）和黑麦草（57.28%）。短链烷烃和低环多环芳烃（PAHs）的降解率明显高于长链烷烃和高环 PAHs。本研究的结果为高盐-碱性环境中的石油去污策略提供了有价值的见解。
