Natural restoration alters soil microbial community structure, but has contrasting effects on the diversity of bacterial and fungal assemblages in salinized grasslands

酸杆菌 物种丰富度 表土 生态学 草原 多样性指数 生物 生态演替 群落结构 恢复生态学 微生物种群生物学 土壤盐分 底土 时序 环境科学 蛋白质细菌 土壤水分 细菌 遗传学 16S核糖体RNA
作者
Wei-Na Wang,Huanjun Liu,Lifei Chen,Kadri Koorem,Yingchao Hu,Liangjun Hu
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:891: 164726-164726 被引量:8
标识
DOI:10.1016/j.scitotenv.2023.164726
摘要

Natural restoration has often been considered an effective measure for rehabilitating degraded ecosystems. However, its impact on the structure and diversity of soil microbial communities, particularly within a salinized grassland during its restoration succession, remains unclear. In this study, we examined the effects of natural restoration on the Shannon-Wiener diversity index, Operational Taxonomic Units (OTU) richness, and structure of the soil microbial community of a sodic-saline grassland in China using high-throughput amplicon sequencing data from representative successional chronosequences. Our results indicated that natural restoration resulted in a significant mitigation of the grassland salinization (pH from 9.31 to 8.32 and electrical conductivity from 393.33 to 136.67 μs·cm−1) and a significant alteration of the soil microbial community structure of the grassland (p < 0.01). However, the effects of natural recovery differed in terms of the abundance and diversity of bacteria and fungi. For example, the relative abundance of the bacterial phyla Acidobacteria increased by 116.45 % in the topsoil and 339.03 % in the subsoil, while that of the fungal phyla Ascomycota decreased by 8.86 % in the topsoil and 30.18 % in the subsoil. There was no significant effect of restoration on bacterial diversity, but fungal diversity increased by 15.02 % in the Shannon-Wiener index and 62.20 % in the OTU richness in the topsoil. Model-selection analysis further corroborated that the alteration of the soil microbial structure by natural restoration may be due to the fact that the bacteria could adapt to the alleviated salinized grassland soil and the fungi could adapt to the improved soil fertility of the grasslands. Overall, our results contribute to an in-depth understanding of the impacts of natural restoration on soil microbial diversity and community structure in salinized grasslands during the long-term successional course. This may also help to apply natural restoration as a greener practice option for managing degraded ecosystems.
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