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Effects of nutrient addition on foliar phosphorus fractions and their resorption in different-aged leaves of Chinese fir in subtropical China

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Abstract

Background and aims

Anthropogenic activities have increased nitrogen (N) and phosphorus (P) inputs to terrestrial ecosystems, which may significantly alter P cycle through accumulation and resorption.

Methods

We measured the concentrations of four different P fractions (inorganic, nucleic, sugar, and residual P) in both live leaves and senescent leaves in N and P additions in an evergreen plantation forest of subtropical China.

Results

Adding moderate N plus P increased total, inorganic, and sugar P concentrations, which sustained the leaf N/P balance and alleviated P limitation in Chinese fir (Cunninghamia lanceolata) plantation. Nitrogen and P (total, nucleic, and residue P) resorption proficiencies did but P (each of various fractions) resorption efficiency did not respond to nutrient addition. The concentrations and resorption efficiencies of most P fractions were lower in the old than young leaves, but their resorption proficiencies except for sugar P weren’t different.

Conclusions

Internal P cycles of Chinese fir could be strongly altered through increasing accumulation of inorganic P and sugar P factions in respond to soil P enrichment when combined with suitable N addition. The easily degradable P (inorganic and sugar P) were preferentially resorbed regardless of nutrient addition. Leaf age was a key-factor influencing the resorption extent of P fractions in Chinese fir.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (grant numbers 31730014, 31870427 and 31760200); and Jiangxi Provincial Department of Science and Technology (grant numbers 20165BCB19006 & 20181ACH80006). We thank Yu Liu, Liqun Zou and Xiulan Zhang for their help with field sampling and laboratory measurement.

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Correspondence to G. Geoff Wang or Fu-Sheng Chen.

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Responsible Editor: Hans Lambers.

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Wang, FC., Fang, XM., Wang, G.G. et al. Effects of nutrient addition on foliar phosphorus fractions and their resorption in different-aged leaves of Chinese fir in subtropical China. Plant Soil 443, 41–54 (2019). https://doi.org/10.1007/s11104-019-04221-8

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  • DOI: https://doi.org/10.1007/s11104-019-04221-8

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