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.
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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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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