Bacterial Diversity and Vertical Distribution Patterns in Sandy Sediments: A Study on the Bacterial Community Structure Based on Environmental Factors in Tributaries of the Yangtze River

Effects of Environmental Factors on Bacterial Communities As shown in Figure 8 and Table 3 , the sample site sediment bacterial Chao1 index showed highly significant negative correlation with interstitial water DO, TN concentration and sediment TC content ( p < 0.01), significantly negatively correlated with interstitial water COD Mn concentration ( p < 0.05), and showed a highly significant positive correlation with sediment N content ( p < 0.01).

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The results of the bacterial α-diversity index revealed that the diversity was abundant in sediments at different depths, with a notable trend across sedimentary layers.

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Alpha Diversity Analysis As shown in Figure 7 , according to the statistical analysis, sediment bacterial α-diversity index had a significant trend, and the variation tended to be consistent among the three sample sites.

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