中文摘要：

从陕北石油污染土壤中富集分离、优选出7株菌株，并进一步研究了7株菌的生理生化特性．菌株鉴定结果表明，SY21为不动细菌属，SY22为奈瑟氏球菌属，SY23为邻单胞菌属、SY24为黄单胞菌属、SY42为动胶菌属、SY43为黄杆菌属、SY44为假单胞菌属．7株菌的降油试验结果表明，降解8d后，加菌试样的石油烃降解率均达到80％左右，7株菌的石油烃降解速率高于目前已有的报道．接种量越大，石油菌数量越多，石油烃降解率随接种量的增加而提高．采用SY43和SY23菌株对土壤进行生物修复，试验结果表明，投加高效菌株SY43和SY23均可在较短的时间内将土壤中的石油污染物去除，去除率可达88．4％和73．4％，其中菌株SY43的修复效果优于SY23．

英文摘要：

7 strains of bacteria were isolated from petroleum-contaminated soil in north of Shaanxi province and their physiological characteristics were investigated. Results showed that strain SY21 was Acinetobacter sp. , strain SY22 Neisseria sp. , strain SY23 Plesiomonas sp. , strain SY24Xanthomonas sp. , strain SY42 Azotobacter sp. , strain SY43 Flavobacterium sp. , and strain SY44 Pseudomonas. sp.. Removal efficiency of the bacteria to TPH （ Total Petroleum hydrocarbon） reached about 80% after 8 days＇inoculation, which is higher than that of bacteria reported. For strain SY43 , the more inoculation the higher removal efficiency to TPH achieved. The experiment of application strain SY43 and SY23 to remedy petroleum-contaminated soil indicated that they could remove 88.4% and 73.4% of TPH, respectively within short period. The strain SY43 was more efficient in bioremediation than that of SY23.