Effects of Secondary Salinization on Soil Phosphorus Fractions and Microbial Communities Related to Phosphorus Transformation in a Meadow Grassland, Northeast China

Effects of Secondary Salinization on Soil Phosphorus Fractions and Microbial Communities Related to Phosphorus Transformation in a Meadow Grassland, Northeast China

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Headband Soil microorganisms play key roles in soil phosphorus (P) mobilization in grassland ecosystems.However, little is known about how bacterial communities involved in P transformation respond to soil secondary salinization.In this study, a meadow grassland with a gradient of secondary salinization in the semi-arid Horqin Sandy Land, Northeast China was selected.Soil properties, P fractions, the P transformation potentials, the community structures, and the abundance of a phosphorus (P)-mineralizing gene (phoD) and a P-solubilizing gene (gcd) were determined.NaHCO3-Pi and NaOH-Pi declined with salinization, whereas H2O-P, NaHCO3-Po, and HCl-Pi increased.

However, the available P fractions (H2O-P and NaHCO3-Pi) remained largely unaffected.Soil salinization significantly decreased the relative abundance of Xanthomonadales and Caulobacterales and increased that of Pseudonocardiales and Enterobacterales.The P fractions, the abundance of the phoD and gcd genes, and the community structures were all closely associated with soil organic matter, total nitrogen, pH, and soil moisture.Additionally, the structures Winter Sports - Soft Goods - Baselayer of the phoD and gcd communities were significantly correlated with NaHCO3-Pi and NaOH-Pi.Overall, secondary salinization altered bacterial communities related to P transformation by modifying soil properties, leading to decreases in the labile P and moderately labile P fractions.