Rhizospheric effect and oil degradation of saline seepweed Suaeda heteroptera in soil contaminated by crude oil
LIU Huan1,2， HE Jie1,2， FAN Xiao-ru1,2， WANG Qing-zhi3,4， LIU Yuan1,2， WEI Hai-feng1,2
1. Key Laboratory of Nearshore Marine Environmental Science and Technology in Liaoning Province, College of Marine Science and Environment, Dalian Ocean University, Dalian 116023, China; 2.Key Laboratory of Marine Bio-resources Restoration and Habitat Reparation in Liaoning Province, Dalian 116023, China; 3.Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Dalian 116023, China; 4.College of Environment, Dalian University of Technology, Dalian 116024, China
Abstract: Contents of amino acid, small-molecule organic acids, and soil total sugar,and enzyme activity, soil bacterial number and crude oil in soil rhizosphere, and degradation rate of phenanthrene and pyrene in soil were analyzed in saline seepweed Suaedaheteroptera exposed to soil contaminated by oil with rhizosphere distance of 0-3.0 mm, 3.1-6.0 mm, 6.1-9.0 mm, 9.1-12.0 mm and>12.1 mm for 90 days (without saline seepweed as ontrol group) through multi- compartment root box experiment in order to investigate the effect of plant rhizosphere effect on crude oil degradation in the dominant saline-alkali plant saline seepweed in coastal mudflats in China. The results showed that there were significantly higher contents of soil low-molecular organic compounds in the treatment groups than those in the control group(P<0.05), with the maximal total sugar and amino acid in the 0-3.0 mm rhizosphere distance, the maximal oxalic acid in the 3.1-6.0 mm rhizosphere distance, significantly higher than those in the other groups(P<0.05). The components were found to be remained unchanged and the content decreased as the rhizosphere distance was increased. The activity of soil polyphenol oxidase and the maximum number of soil bacteria were observed in the rhizosphere distance of 3.1-6.0 mm, significantly higher than those in other groups(P<0.05). The crude oil concentration was significantly lower in the treatment groups than that in the control group, the maximum in the rhizosphere distance of 3.1-6.0 mm, significantly higher than that in other groups(P<0.05). In a whole, the soil oil concentration was shown to be increased with the increase in rhizosphere distance. The findings indicate that the rhizosphere of saline seepweed can reduce the soil oil concentration，with the minimal soil oil concentration in 3.1-6.0 mm rhizosphere distance.
刘欢, 何洁, 樊晓茹, 王庆芝, 刘远, 魏海峰. 原油污染土壤翅碱蓬根际效应和降解的研究[J]. 大连海洋大学学报, 2019, 34(2): 191-197.
LIU Huan, HE Jie, FAN Xiao-ru, WANG Qing-zhi, LIU Yuan, WEI Hai-feng, . Rhizospheric effect and oil degradation of saline seepweed Suaeda heteroptera in soil contaminated by crude oil. Journal of Dalian Ocean University, 2019, 34(2): 191-197.
2019, Vol. 34 
