Comparison of Soil Bacterial Communities under Canopies of and in a Reclaimed Waste Dump.

To compare the effects of different remediation tree species on soil bacterial communities and provide a theoretical basis for the selection of ecosystem function promotion strategies after vegetation restoration, the characteristic changes in soil bacterial communities after and reclamation were explored using high-throughput sequencing and molecular ecological network methods. The results showed that: (1) With the increase in reclamation years, the reclaimed soil properties were close to the control group, and the soil properties of were closer to the control group than those of . (2) The dominant bacteria under the canopies of and was the same. , , , , , , , and were the dominant bacteria in the restored soil, accounting for more than 95% of the total abundance. The average values of the Shannon diversity index, Simpson diversity index, Chao 1 richness estimator, and abundance-based coverage estimator of the bacterial community in the reclaimed soil were higher than those in the reclaimed soil. The influence of reclamation years on the bacterial community of samples is greater than that of species types. (3) The results of ecological network construction showed that the total number of nodes, total number of connections, and average connectivity of the soil bacterial network under reclamation were greater than those under reclamation. The bacterial molecular ecological network under was more abundant. (4) Among the dominant bacteria, the relative abundance of was negatively correlated with soil pH, soil total nitrogen content, and the activities of urease, invertase, and alkaline phosphatase, while the relative abundance of and was positively correlated with these environmental factors. The relationship between the soil bacterial community of and and the environmental factors is not completely the same, and even the interaction between some environmental factors and bacteria is opposite.