不同丛枝菌根真菌对万寿菊生长及柴油降解率的影响

在盆栽条件下，用沈抚污灌区非灭菌水稻土，研究了柴油浓度为5000mg·kg^1时接种3种AM真菌(Glomus mosseae,G.geospora,G.constrictum)和细菌对万寿菊(Tagetes erecta)耐油性的影响。结果表明，在此浓度下，AM菌仍能和万寿菊形成共生体，白色万寿菊比黄色万寿菊耐油能力强，总生物量增加63．1％；接种AM真菌的处理，其侵染率比对照高3．5％～29．9％．G．masseae和G．geospora是较好的菌种，总生物量分别比对照增加9．0％和42．7％；混接AM真菌效果一般。施入细菌菌剂虽然抑制了AM菌对万寿菊的侵染，但促进了菌根化植物的营养生长和生殖生长，5种接菌处理中，以接种G．geospora和混接AM菌和细菌的处理最好，对柴油的降解率分别比对照增加16．51％和14．05％。

Effects of different arbuscular mycorrhizal fungi on Tagetes erecta growth and diesel degradation

The effects of G. mosseae, G. geospora, G. constrictum and bacteria on diesel tolerance of Tagetes erecta were investigated under greenhouse conditions. The results showed that AM fungi could still develop mycorrhizal assosiations with mum when the diesel concentration was 5,000 mg.kg-1. White mum was better than yellow mum in diesel tolerance, with 63.1% total biomass increased. The colonization rate of inoculating AM fungi treatment was 3.5%-29.9% higher than the control. G. mosseae and G. geospora were better strains, their biomass increasing 9.0% and 42.7% than the control, respectively, while the effect of inoculating mixed AM fungi was not obvious. Bacteria inhibited the colonization of arbuscular mycorrhizal fungi on white mum, but promoted the vegetative and reproductive growth of mycorrhizal mum. Among 5 inoculation treatments, treatments of inoculating G. geospora and inoculating mixed AM fungi and bacteria were better, with 16.51% and 14.05% more diesel degradation rate than that of the control, respectively.