污泥堆肥利用中AM对稗草生长及Cu、Pb吸收的影响

在滨海盐渍土中分别混加质量分数为0%、20%、40%和60%的污泥堆肥,作为盆栽基质,研究摩西球囊霉（Glomusmosseae）和根内球囊霉（Glomus intraradices）2种AM真菌对稗草（Echinochloa crusgalli）生长及其吸收Cu、Pb的影响,分别以不接种AM真菌的处理为各自的对照。结果显示：添加污泥堆肥处理中稗草接种苗菌根侵染率均显著高于纯盐泽土处理。同时,随着盐渍土中污泥堆肥含量增加稗草生物量上升,其中在含有40%和60%污泥堆肥处理中接种AM真菌稗草的地上及地下部生物量显著高于未接种苗。接种AM真菌显著提高了稗草Cu、Pb富集总量;接种AM真菌显著提高了稗草地下部Cu富集量,却降低了地下部Pb累积量,提高了Pb向地上部的转运,增加了地上部Pb累积量。这些结果表明污泥堆肥中接种AM真菌可以促进稗草的生长和提高对重金属Cu、Pb的富集能力。

Arbuscular mycorrhizal effect on Echinochloa crusgalli growth and heavy metal accumulation in application of sewage sludge compost

Coastal saline soil mixed with 0%,20%,40% and 60%（w/w） sewage sludge compost,respectively,was utilized as pot culture media.The influence of two Arbuscular mycorrhizal,Glomus mosseae and Glomus intraradices,on growth and Cu,Pb uptake of Echinochloa crusgalli cultured in pots filled with above media was studied.The soil without incubation of the Arbuscular mycorrhizal fungi was used as control.The results showed that mycorrhizal colonization rate of E.crusgalli seedlings cultured in soil containing compost was obviously higher than those in pure saline soil.Meanwhile,the biomass of E.crusgalli seedlings increased with the sludge content increasing.And the biomass of seedling in 40% and 60% sewage sludge was increased significantly by inoculation with AM fungi.Total Cu and Pb contents of plants were both increased when E.crusgalli seedlings were inoculated with AM fungi.Fungi incubation apparently enhanced Cu accumulation in root of E.crusgalli seedlings,and promoted Pb transporting from root to shoot.These results indicated that AM fungi incubation could promote the E.crusgalli growth and enhance Cu and Pb accumulation.