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Bacterial taxa have different responses to alterations in soil variables along a degradation gradient in the Napahai wetlands

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Abstract

The shift in belowground biodiversity driven by wetland degradation is a hotspot research in global change ecology. However, little is known about the association of microbial diversity with alteration in soil environment along a degradation gradient. This study aimed to identify the specific response of bacterial taxa to change in soil variables along wetland degradation gradient, using Illumina high-throughput sequencing technology. Four stages, including primary wetland (for reference), swamp meadow (transitional stage), meadow (degraded stage), and reclaimed wetland (severely degraded stage), were employed to identify the abundance change of different bacterial taxa along degradation gradient in the Napahai plateau. The relative abundance of dominant taxa, i.e., Acidobacteria (8.5–25.6%) and δ-Proteobacteria (7.2–21.7%), varied with wetland degradation. The primary and transitional stages distributed higher δ-Proteobacteria abundance (19–21.7%), while degraded stages had higher Acidobacteria (22.7–25.6%). We observed a conspicuous decrease (1.5–5.3 times) in soil water, organic matter, and total and available nitrogen, but a distinct increase (1.1–2.8 times) in carbon to nitrogen ratio, and total phosphorus compared with primary wetland. The δ-proteobacteria abundance was mainly determined by concentrations of soil water, organic matter, and total and available nitrogen, whereas Acidobacteria abundance was closely associated with carbon to nitrogen ratio and total phosphorus. Therefore, our results indicate that alterations in edaphic variables (e.g., soil water, carbon, nitrogen, and phosphorus) can serve as crucial predictors for shift in taxa abundance of bacterial community along degradation gradient.

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Funding

Our study was supported by National Nature Science Foundation of China (42067011), Fundamental Research of Yunnan Province (202001AT070113), Yunnan Province Talent Reserve Project for training young and middle-aged academics and technology leaders; Fund Project for Doctor to start science research in Southwest Forestry University (111901).

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Correspondence to Mei Lu.

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Lu, M., Li, C., Ren, Y. et al. Bacterial taxa have different responses to alterations in soil variables along a degradation gradient in the Napahai wetlands. Arab J Geosci 15, 607 (2022). https://doi.org/10.1007/s12517-021-09273-8

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