Abstract
Background
Despite the high phosphorus (P)-mobilizing capacity of legumes, little is known about the dynamics of the P fractions and bacterial communities in the rhizosphere of legumes in karst soils.
Methods
A field experiment was established to investigate P uptake, rhizosphere P fractions and bacterial community structure of soybean (Glycine max (L.) Merr.) in response to P fertilization (0 and 90 kg P ha−1) in karst soils.
Results
Significant rhizosphere acidification was observed during soybean cultivation. Phosphorus fertilization further decreased soil pH, HCl-Pi and residual P, but increased NaHCO3-Pi in the rhizosphere of soybean variety YC03–3, which was associated with the simultaneous increase in P uptake and biomass. In addition, the bacterial community composition was significantly altered by P fertilization through its effects on soil pH and Ca. Bacillales and Pseudomonadales were the primary taxa influencing P dynamics, especially in soils without P input. Nevertheless, P fertilization decreased the relative abundance of Bacillales and Pseudomonadales, probably due to the enhanced rhizosphere acidification and improved P status.
Conclusions
In karst soils, recalcitrant P can be depleted directly or transformed into more labile fractions by soybean rhizosphere acidification, even when P fertilizer is applied. As a consequence, P fertilization suppressed the growth of bacteria (Bacillales and Pseudomonadales) that contribute to P mobilization due to the reduced demands on these taxa to release P. Our findings highlight the importance of P fertilization in chemical P mobilization, which may consequently influence biological P turnover in the soybean rhizosphere.
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Acknowledgements
This study was financially supported by the Integrated Demonstration of Key Techniques for the Industrial Development of Featured Crops in Rocky Desertification Areas of Yunnan–Guangxi–Guizhou Provinces (SMH2019-2021), the National Natural Science Foundation of China (41807084, 31601830), the Natural Science Foundation of Guangdong Province, China (2018A030310214) and the Science and Technology Project of Guangdong Province, China (2019B030301007). We thank Dr. Xiaodong Chen from Zhejiang Academy of Agricultural Sciences for reviewing the manuscript, we thank Baoxing Xie, Guoxuan Liu, Guangfen Peng and Panmin He for their assistance with soil sampling in 2019. Special thanks are also due to Mr. Dafang Song for his assistance with managing the field trial.
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Tian, J., Lu, X., Chen, Q. et al. Phosphorus fertilization affects soybean rhizosphere phosphorus dynamics and the bacterial community in karst soils. Plant Soil 475, 137–152 (2022). https://doi.org/10.1007/s11104-020-04662-6
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DOI: https://doi.org/10.1007/s11104-020-04662-6