Abstract
Aims
Foliar nutrient resorption is a critical process for considerations of ecosystem nutrient cycles. Previous studies have described the independent effects of climatic factors, plant and soil nutrient status on nutrient resorption. However, little is known about the comprehensive effects of these factors on nutrient resorption, especially based on observations in situ.
Methods
In a semi-arid grassland of the Loess Plateau, China, we conducted an eight-year field survey and sampled leaves and soils separately in 2013, 2016, and 2020. We explored interannual variation in foliar nutrient resorption efficiency (NuRE, including nitrogen and phosphorus resorption efficiency, i.e., NRE and PRE) and the driving factors in graminoids and forbs.
Results
The NuRE in graminoids varied significantly, but in forbs varied insignificantly among years, indicating a more flexible nutrient resorption strategy in graminoids. Further, climatic variables showed stronger effects on NuRE than soil nutrients. Specifically, growing-season temperature and precipitation controlled NuRE of graminoids and forbs by regulating green leaf N:P ratio ([N:P]g), while soil nutrients did not affect NuRE. The regulation of [N:P]g on NuRE was explained by foliar stoichiometric control in which N and P were resorbed proportionally with [N:P]g. Meanwhile, the positive relationships between NRE and PRE and between NRE:PRE and [N:P]g confirmed stoichiometric control on NuRE.
Conclusion
Our findings suggested that growing season hydro-thermal factors affected the interannual variations of NuRE through a foliar stoichiometric control strategy. Meanwhile, more NuRE plasticity and positive responses to climatic factors in graminoids (the dominant group here) could explain their dominance in this grassland.
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Data availability
The data that support this study are available from the corresponding author upon reasonable request.
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Acknowledgements
We greatly appreciate Guanghua Jing, Jishuai Su, Ruimin Luo, Zhoumin Zheng, Jin Mao, and Ying Duo for help with the fieldwork and data collection. We would like to thank a native speaker from the HighEdit company for assistance with the English language editing of this manuscript.
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This project was funded by the National Natural Science Foundation of China (41701606), the Natural Science Basic Research Plan in Shaanxi Province (2021JM-093), the Youth Talent Development Program of Northwest A&F University (2452020009), the Innovation Project from Institute of Soil and Water Conservation (A315022208), and the National Key Research and Development Program of China (2016YFA0600801).
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Conceptualization and Methodology, L Guo; Data curation, WH Fu; Formal analysis, Writing – original draft preparation, and Visualization, XW Liu and WH Fu; Writing – review & editing, YQ Wang, ZY Yuan, Q Yu, CH Peng, SE Koerner, and L Guo. All authors gave final approval for publication and agreed to be held accountable for the work performed therein.
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Liu, X., Wang, Y., Fu, W. et al. Growing season temperature and precipitation affect nutrient resorption in herbaceous species through a foliar stoichiometric control strategy. Plant Soil 493, 45–60 (2023). https://doi.org/10.1007/s11104-023-06214-0
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DOI: https://doi.org/10.1007/s11104-023-06214-0