【摘要】 针对河道沉积物受重金属污染严重的问题，采用玉米、黑麦草、紫花苜蓿间作和轮作进行盆栽试验，设置单纯植物、丛枝菌根（AM）真菌联合植物和AM真菌-土著优势菌联合植物3种处理方式，研究微生物辅助植物修复技术对沉积物中重金属的异位修复效果及机理。结果表明，微生物联合植物间作-轮作的种植方式可形成优势互补，促进沉积物中重金属Cd和Ni的降解。第1轮玉米和黑麦草间作对Cd的降解效果较好，尤其是施加AM真菌后，沉积物中的Cd含量分别下降了21.81%和30.66%;AM真菌有利于Cd形态向可生物利用态转化，同时增加了脱氢酶和脲酶活性，可提高植物根系对Cd的富集。第2轮紫花苜蓿和黑麦草间作对Ni的降解效果较好，施加AM真菌和AM真菌-土著优势菌后黑麦草根系沉积物中的Ni含量分别降低了24.45%和31.80%。更多还原

【Abstract】 To address the issue of heavy metal pollution in river sediments, pot experiments were conducted to investigate the ectopic repair performance and mechanism of microbial-assisted phytoremediation technology in mitigating heavy metal contamination in river sediments. The experiments involved intercropping and rotation of corn, ryegrass and alfalfa, and set up three treatment groups: simple plant, AM fungi combined plant, and AM fungi-indigenous dominant bacteria combined plant. The microbial combined plant intercropping-rotation method complemented each other and promoted the conversion of heavy metals Cd and Ni in sediments. In the first round of corn and ryegrass intercropping,there was a decrease in Cd content in sediments by 21.81% and 30.66%, respectively, particularly after the addition of AM fungi. AM fungi showed the ability to facilitate the conversion of Cd into a bioavailable state, as well as increase the activities of dehydrogenase and urease. Additionally, they enhanced the accumulation of Cd in plant roots. In the second round of alfalfa and ryegrass intercropping, the Ni content in ryegrass root sediments decreased by 24.45% and 31.80%, respectively, after the addition of AM fungi and AM fungi-indigenous dominant bacteria.更多还原