Abstract
Phosphorus (P) is a limiting nutrient for plant growth in most forest ecosystems. In response to P deficiency, plants alter root exudates (organic acids, phosphatases, and protons) to increase P bioavailability in soils. However, little is known about how bioavailable P pools (soluble-P, exchangeable-P, hydrolysable-P, and ligand-P extracted by CaCl2, citric acid, enzyme mixture, and HCl solution, respectively) change with stand age, especially for plantation forests. We selected a chronosequence of second-generation Chinese fir [Cunninghamia lanceolata (Lamb.) Hook., Taxodiaceae] plantations with increasing age including 3, 8–11, 16, 20, 25, 29, and 32 years. We measured total P and four bioavailable P pools in organic (O) and mineral horizons, and rhizosphere soil, as well as root exudates in the rhizosphere, litter biomass on the forest floor, and annual P uptake. Soluble-P, exchangeable-P, and ligand-P in the O horizon increased with stand age due to litter accumulation. Exchangeable-P and ligand-P in mineral soil decreased with stand age because of the increasing annual P uptake that depleted inorganic P. Exchangeable-P and ligand-P in the rhizosphere increased with stand age because the decrease in pH and citric acid concentration led to phosphate being more strongly bound to Fe and Al oxyhydroxides. Consequently, the trees’ ability for P mobilization decreased with stand age, but the P recycling within the tree increased. Continuous mineralization of hydrolysable-P by acid phosphatase replenished inorganic P pools, especially in solution. The progressive incorporation of P in the biological cycle with increasing tree age indicates that extending rotation periods might be an appropriate measure to increase P supply.
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Acknowledgements
This study was supported by the National Key Research and Development Program of China (2016YFD0600202) and the Huitong Forest Ecological Station funded by the State Forestry Administration of China. We thank the postgraduates for their assistance in field sampling: Lingxiu Chen, Wenbo Zhou, Linying Jiang, Chuantao Yang, Chuanhong Xu, Yuyu You, and Jiani Ma. Thanks also go to the staff from the Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan Province, for their experimental support. Special thanks to the Ministry of Education providing Yakov Kuzyakov the Chanjiang Professorship Award. We would like to thank Prof. Simon Queenborough at the Yale University for his assistance with English language editing of the manuscript.
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Wu, H., Xiang, W., Chen, L. et al. Soil Phosphorus Bioavailability and Recycling Increased with Stand Age in Chinese Fir Plantations. Ecosystems 23, 973–988 (2020). https://doi.org/10.1007/s10021-019-00450-1
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DOI: https://doi.org/10.1007/s10021-019-00450-1