A pot culture experiment was carried out to study the influence of Arbuscular mycorrhizal on the growth and Cu accumulation of Bidens pilosa. Six levels of sewage sludge compost(0%, 20%, 40%, 60%, 80%, 100%), two AM fungal inoculation and one nonmycorrhizal inoculum(CK)were applied to coastal saline soils. The results showed that the biomass of B. pilosa seedlings was increased significantly with the sludge content increasing, and at level 40%-80% sewage sludge compost the biomass of inoculated seedlings was significantly higher than that of non-inoculated seedlings. Mycorrhizal infection rate at level of 20%-80% sewage sludge was increased significantly by inoculated with 2 AM fungi. Cu concentration of inoculated plant roots was significantly increased at level of 0%～60% sewage sludge, there was no significant difference in high proportion of sewage sludge between inoculated and non -inoculated plants. Cu accumulation of plant root was significantly increased when B. pilosa seedlings were inoculated with AM fungi, and Cu accumulation of inoculated plant roots was 3-4 times of plant shoots. These results indicated that AM fungi could promote the Bidens pilosa's growth and enhance to uptake heavy metal ions Cu.%采用盆栽试验,研究在不同污泥堆肥含量的滨海盐渍土中,AM对三叶鬼针草生长及植株内Cu富集量的影响.试验设计0％、20％、40％、60％、80％、100％污泥堆肥含量共6个土壤处理水平,2个AM真菌菌株和1个对照.结果显示:随着盐渍土中污泥堆肥含量增加三叶鬼针草生物量显著上升,在40％、80％污泥含量处理中,接种苗地上及地下生物量均显著高于非接种苗;接种苗侵染率在20％ ～80％污泥堆肥处理中显著高于纯盐渍土处理;在较低污泥含量处理中(0％～60％),三叶鬼针草接种苗地下部Cu浓度显著高于非接种苗,而在高污泥含量处理中,接种苗与非接种苗差异不显著；接种AM真菌提高三叶鬼针草地下部Cu富集总量,接种苗根系内Cu富集量是地上部的3～4倍.表明污泥堆肥中接种AM真菌可以促进三叶鬼针草的生长和提高对重金属Cu的富集能力.
展开▼
