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草业学报 ›› 2016, Vol. 25 ›› Issue (7): 87-94.DOI: 10.11686/cyxb2015446

• 研究论文 • 上一篇    下一篇

丛枝菌根真菌与植物共生修复陕北石油污染土

山宝琴*, 屈萌萌, 李皎, 李超   

  1. 延安大学石油工程与环境工程学院,陕西 延安 716000
  • 收稿日期:2015-09-23 修回日期:2015-12-10 出版日期:2016-07-20 发布日期:2016-07-20
  • 作者简介:山宝琴(1970-),女,新疆乌鲁木齐人,副教授,博士。E-mail:xiaoshanbao@163.com
  • 基金资助:
    陕西省高水平大学专项资金项目(No.2013SXTS03),延安市科技项目(No.2014KS-03),延安大学引导项目(No.YD2015-14)和国家大学生创新项目(No.201410719009)资助

Bioremediation of petroleum contaminated soil by plants and arbuscular mycorrhizal fungi in Northern Shaanx

SHAN Bao-Qin*, QU Meng-Meng, LI Jiao, LI Chao   

  1. School of Petroleum Engineering and Environmental Engineering, Yan’an University, Yan’an 716000, China
  • Received:2015-09-23 Revised:2015-12-10 Online:2016-07-20 Published:2016-07-20

摘要: 研究先期筛选了4种陕北乡土植物黄花蒿、艾蒿、柠条和沙打旺,及植物根围匹配的丛枝菌根(arbuscular mycorrhiza, AM)真菌菌种,通过盆栽试验测定AM真菌孢子密度、宿主植物根系菌丝侵染率、植物株高、干重和土壤总石油烃的降解率。旨在研究接种AM真菌对污染土壤中总石油烃的降解率以及对宿主植物生长的影响, 验证菌根修复效果并筛选最佳宿主植物和菌种组合。结果表明,1) AM真菌孢子密度最大值出现在石油浓度0~5000 mg/kg土壤,并随污染浓度加大而显著减少,40000 mg/kg 时达最小值。植物菌根侵染率在土壤被污染的情况下显著高于无污染对照,同时接种AM后孢子密度及菌根侵染率均显著高于未接种;2) 植物株高和干重都随石油污染浓度加大而显著降低,接种处理后植物株高平均增加16.77%,植物鲜重平均增加了22.56%; 3) 植物接种AM真菌后对石油烃降解率明显提高,比不接种平均增加15.35%。其中,柠条-地球囊霉组合的石油烃降解率最高(平均为73.81%);4) 相关分析表明,接种AM真菌后石油烃降解率与石油烃浓度呈极显著负相关,与植物株高、干重和真菌孢子密度呈显著正相关。

Abstract: A new bioremediation technique utilizing the symbiotic function between host plant and arbuscular mycorrhizal fungi (AMF) for petroleum contaminated soil was investigated in Northern Shaanxi in 2015. Four species of native plants in Northern Shaanxi studied were Artemisia annu, Artemisia argyi, Caragana korshinskii and Astragalus adsurgens, and AMF species were isolated from the rhizosphere of each species and used to inoculate field grown plants in contaminated soil to test effects of AMF on the degradation of petroleum hydrocarbon in soil and to select the best plant-AMF match. It was found that AMF spore densities were highest in soil with 0-5000 mg petroleum/kg soil, and significantly decreased with increasing petroleum concentration. AMF hyphal densities were higher in petroleum contaminated soil than in uncontaminated soil. The inoculation with AMF increased spore density and the percentage of AM colonization. Plant height and dry weight were decreased with increasing petroleum concentration, but both were significantly promoted by AMF inoculation AMF, with plant height increased by 16.77% and dry weight by 22.56%. Degradation efficiency of petroleum hydrocarbon in soil was enhanced by AMF inoculation, and was 15.35% higher than that of uninoculated soil. Among the plant-AMF combinations, Caragana korshinskii and Glomus geosporum was the best for petroleum degradation, and the degradation rate was 73.81% after 2 months. After inoculation with the selected AMF species, degradation rates of petroleum hydrocarbon and petroleum concentration in soil showed an obvious negative correlation, but degradation rates were significantly positively correlated with spore density, plant height and plant dry weight.