Abstract
Aims
Increasing temperature and nitrogen (N) deposition are major drivers of global change that will influence plant-soil systems. We aimed to understand how plant stoichiometry and nutrient limiting types could change with continued warming and N inputs in subtropical regions.
Methods
In 2014, the experiments were established in 30 mini-plots (2 × 2 m) with the following treatments: control, high N addition, low N addition, warming, warming + high N addition, and warming + low N addition. We sampled the leaf and root of Cunninghamia lanceolata and soils to assess their elemental and stoichiometric variables and δ15N under all six conditions.
Results
Both experimental warming and N fertilization consistently induced an increase in fine-root N, P, and N:P. The N:P ratio of the mature green-leaf and soil was 7.24–11.63 and 4.79–6.56, respectively. On average, C. lanceolata showed higher proportional P resorption, but lower N resorption. The δ15N enrichment factor significantly increased in the warming and N addition treatments.
Conclusions
N addition decrease leaf N content, and increased the plant growth, which was due to the effect of the N dilution of C. lanceolata. In subtropical regions, N-limitation affects the growth of C. lanceolata, and the concurrent increase in warming and N fertilization should help relieve N-limiting conditions.
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Acknowledgments
The research was funded by the National “973” Program of China (No. 2014CB954003), the National Natural Science Foundation of China (No. 31130013), and Fujian Provincial Department of Science and Technology (No. 2016R1032–2).
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Zhang, Q., Xie, J., Lyu, M. et al. Short-term effects of soil warming and nitrogen addition on the N:P stoichiometry of Cunninghamia lanceolata in subtropical regions. Plant Soil 411, 395–407 (2017). https://doi.org/10.1007/s11104-016-3037-4
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DOI: https://doi.org/10.1007/s11104-016-3037-4