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Differential factors determine the response of soil P fractions to N deposition in wet and dry seasons in a subtropical Moso bamboo forest

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Abstract

Background

Elevated nitrogen deposition can alter the soil P (phosphorous) composition and availability, thereby affecting long-term plant growth. However, the effects of N (nitrogen) deposition and seasonal changes on soil P fractions in subtropical forests remain elusive.

Methods

We conducted an experiment to simulate N deposition in a subtropical Phyllostachys pubescens (Moso bamboo) forest. We collected samples during the wet and dry seasons (2018–2019) and determined soil abiotic and biotic factors and soil P fractions.

Results

N deposition in the wet season significantly reduced the content and proportion of labile P and organic P extracted from NaOH, wherein it markedly increased only NaHCO3-Pi content during the dry season. Redundancy analysis and structural equation model showed that soil P was primarily affected by acid phosphatase and root P content under N deposition in the wet season, whereas organic-bound Fe (Fep) and NO3-N concentrations under N deposition treatment were the key factors during the dry season. These factors explained 22.5% and 9.2%, and 21.0% and 15.4% of the changes in soil P fractions in the wet and dry seasons, respectively.

Conclusions

Our study suggests that N deposition accelerates the soil P cycle in the wet season due to increased plant P absorption and acid phosphatase activity. N had a minor effect on soil P fractions in the dry season because of decreasing P adsorption from Fe and Al oxides. These findings provide insights into understanding soil P transformation and supply in response to N deposition and seasonal changes in subtropical forests.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

References

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Funding

This work was supported by the National Natural Science Foundation of China (Nos. 41977090), the Natural Science Foundation of Fujian Province (No. 2020J01142 and 2020J01397) and Anhui Province (No. 2108085QC105).

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Correspondence to Yuehmin Chen.

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Conflicts of interests

The authors declare that they have no known competing fnancial interests or personal relationships that could have appeared to infuence the work reported in this paper.

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Zeng, Q., Fan, Y., Zhang, Q. et al. Differential factors determine the response of soil P fractions to N deposition in wet and dry seasons in a subtropical Moso bamboo forest. Plant Soil 498, 161–179 (2024). https://doi.org/10.1007/s11104-022-05768-9

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  • DOI: https://doi.org/10.1007/s11104-022-05768-9

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