丛枝菌根(AM)真菌对土壤中阿特拉津降解的影响

Effect of Arbuscular Mycorrhizal (AM) Fungi on Atrazine Degradation in Soil Planted Sorghum

于盆栽高粱(Sorghum,龙杂一号)条件下研究了丛枝菌根(AM)真菌根内球囊霉(Glomus intraradices,GI)和摩西球囊霉(Glomus mosseae,GM)降解土壤中阿特拉津的效用。结果表明,阿特拉津(浓度为50 mg/kg)污染土壤中,供试AM真菌都能够侵染高粱根系形成菌根,而且GM比GI侵染效果好,最高侵染率可达到90.5%,显著提高了植株的生物量。接种AM真菌后土壤中阿特拉津的残留浓度显著低于不接种对照处理,并且接种GM比GI对阿特拉津的降解效果显著。接种GM处理的土壤中阿特拉津最高降解率达到了91.6%,其中菌根效应占22.6%。接种AM真菌的宿主植物根际土壤中微生物数量多于不接种处理,且GM优于GI处理,说明AM真菌能促进根际微生物的繁殖。此外,接种AM真菌后能显著增加土壤中脲酶活性,但对过氧化氢酶活性影响不显著。认为GM是一株比较理想的修复阿特拉津污染土壤的AM真菌。

A sorghum pot experiment was conducted to assess the effect of AM fungi glomus intraradices（GI） and glomus mosseae（GM） to degrad Atrazine in soil.The results showed that in 50 mg/kg Atrazine polluted soil,GI and GM could both invade sorghum root to form mycorrhiza,and the infection rate of GM is higher than that of GI while the GM invading rate was 90.5%,the highest.It could also be concluded that AM fungi leading to a comparatively better plant productivity.The residue concentration of Atrazine in soil was lower in AM inoculated treatment compared with that of uninoculated,and GM inoculation results in better degradation performance than GI.The mycorrhiza effect is 22.6% in 91.6% degradation rate of Atrazine in soil inoculated with GM.The amount of microorganisms in rhizosphere soil is larger in soil inoculated with AM fungi especially with GM,that probably means AM fungi could accelerate the reproduction of rhizo-microorganisms.AM inoculation could enhance urease activity but not significantly to catalase activity in soil.Therefore,GM is an ideal AM fungus in remediation of Atrazine contaminated soil.