Abstract
Purpose
To evaluate the effects of enhanced nitrogen (N) load on turnover of phosphorus (P) in Suaeda salsa marsh in the Yellow River estuary, the variation and allocation of P in the plant-soil system were investigated in the growing season.
Methods
This study was explored by field N addition experiment which included four load levels: NNL (no N load treatment, 0 gN m−2 yr−1), LNL (low N load treatment, 3.0 gN m−2 yr−1), MNL (medium N load treatment, 6 gN m−2 yr−1), and HNL (high N load treatment, 12 gN m−2 yr−1).
Results
In most sampling periods, the TP contents in soils in the LNL, MNL, and HNL treatments showed a decreasing trend compared to the NNL treatment. With increasing N load levels, the contents of non-available decomposed P in soils decreased by 3.08 ~ 5.22%, while those of easily available and moderately available P increased by 0.36 ~ 8.92% and 1.21 ~ 24.24%, respectively. The variations of NaOH-Po, Resin-Pi, and NaHCO3-Po contents primarily rested with the duration of N import, while those of NaOH-Pi, Residual-P, NaHCO3-Pi, and HCl-Pi contents mainly depended on the levels of N load. Dissimilar variations of TP contents in plant tissues in the growing season were observed among N load levels, which were dependent on the structure and function of organs and the nutrient function of P at distinct growth stages. The P absorption coefficients (PAC) of plants in N load treatments increased by 31.82 ~ 36.36%, while the P utilization coefficients (PUC) decreased by 4.96 ~ 13.33%.
Conclusion
This paper found that the S. salsa was very likely to adjust its growth rhythm and P absorption/utilization capacity to adapt N load environment. Particularly, as N load reached medium level, the P supply relationships between aboveground and belowground tissues and the P transferences in the plant-soil system were greatly altered, indicating that the S. salsa might have a special response to the medium N enrichment. Thus, the potential impacts of medium N load level on S. salsa marsh should be emphasized in the future.
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Funding
This study was financially supported by the National Natural Science Foundation of China (No. 41371104, 41971128) and the Award Program for Min River Scholar in Fujian Province (No. Min [2015]31).
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Sun, Z., Yu, L., Hu, X. et al. Effects of enhanced nitrogen load on variation and turnover of phosphorus in the plant-soil system of Suaeda salsa marsh in the Yellow River estuary, China. J Soils Sediments 23, 2428–2443 (2023). https://doi.org/10.1007/s11368-023-03490-2
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DOI: https://doi.org/10.1007/s11368-023-03490-2