Effects of Cadmium Contamination on the AM Fungal Community in Farmland Soil
In order to reveal the impact mechanism of heavy metal cadmium(Cd)pollution on the composition and diversity of arbuscular mycorrhizal(AM)fungal communities in farmland,soils samples from Cd-contaminated area and uncontaminated area of farmland were collected as the research objects.The differences in the composition and diversity of soil AM fungal communities were analyzed by high-throughput sequencing.The main soil environmental factors driving the changes in the composition and diversity of AM fungal communities under soil Cd contamination,as well as their effects were studied.The results showed that the dominant genera of AM fungi in both Cd-contaminated and non-contaminated agricultural soils were Glomus and Paraglomus,accounting for 37.80%～57.27%of the community.There was a highly significant difference in the relative abundance of Glomus AM fungi between the two treatments(P<0.01).The species number of AM fungi and the Chao1 index in the soil of the Cd-contaminated areas were 21.97%and 22.36%lower,respectively,compared to the non-contaminated areas.The Shannon index and Simpson index were 14.80%and 5.26%lower,respectively,with highly significant differences between treatments(P<0.01).Non-metric multidimensional scaling(NMDs)analysis showed that there were differences in the composition of AM fungal communities between soils from Cd-contaminated and non-contaminated areas,and Cd contamination significantly changed the β-diversity of the soil AM fungal community.Under Cd contamination,available Cd(P=0.004)and total phosphorus concentration(P=0.042)in the soil were the main factors driving changes in the composition of the AM fungal community.The total soil Cd concentration(P=0.01)was the main factor causing changes in AM fungal community diversity.The content of available Cd in the soil had a direct effect on the composition of the AM fungal community,and the total soil Cd content had a direct effect on changes in AM fungal diversity.The content of Cd in the soil of the contaminated area was more likely to cause changes in the composition and diversity of the soil AM fungal community compared to the total phosphorus content.
万方数据
维普
