【摘要】 调查了四川遂宁地区磨溪油田石油污染土壤中丛枝菌根(AM)真菌资源和菌根发育状况。结果表明:调查的14种植物中13种能形成AM,占93%,共分离出AM真菌19种,隶属球囊霉属(Glomus)、无梗囊霉属(Acaulospora)和原囊霉属(Archeospora),其中球囊霉属为该地区优势属,缩球囊霉(Glomus constrictum)和摩西球囊霉(G.mosseae)为优势种;植物根际土壤孢子密度在39~548个.100g-1土,平均为197个.100g-1土;菌根侵染率为17%~69%,菌根侵染强度为2%~24%,表明石油污染区植物具有较强的菌根依赖性。相关性分析表明,石油污染浓度与孢子密度呈显著负相关,与菌根侵染率及侵染强度无相关性。寄主植物一年蓬(Erigeron annuus)和艾蒿(Artemisia argyi)在石油污染浓度为11450和14950mg.kg-1时侵染率仍高达69%和47%,可能是抗石油胁迫的优势植物。更多还原

【Abstract】 The arbuscular mycorrhizal fungi(AMF)in petroleum-contaminated soil in Moxi oil field of Suining area,Sichuan Province were surveyed,with their infection on 14 plant species studied.It was found that 13 of the 14 plant species could form arbuscular mycorrhizae.A total of 19 AMF species belonging to Glomus,Acaulospora and Archeospora were isolated.Glomus was the dominant genera,while G.constrictum and G.mosseae were the dominant species.The AMF spore density ranged from 39 to 548 per 100 g soil,with an average of 197,and the infection rate and infection intensity were in the range of 17%-69% and 2%-24%,respectively.The high density of AMF spores in rhizosphere soil and the intensive infection on host plant roots indicated that the plants grown on petroleum-contaminated soil might be highly dependent on AMF.Soil petroleum concentration had a significant negative correlation with AMF spore density,but no relationships with AMF infection rate and infection intensity.The Erigeron annuus and Artemisia argyi grown on the soil with petroleum concentration of 11 450 mg·kg-1 and 14 950 mg·kg-1 had an AMF infection rate of 69% and 47%,respectively,suggesting that the two plants could be the dominant plants against petroleum stress.更多还原