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Co-limitation of Fine Root Growth by Nitrogen and Phosphorus in Early Successional Northern Hardwood Forests

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Abstract

Functional balance theory predicts that plants will allocate less carbon belowground when the availability of nutrients is elevated. We tested this prediction in two successional northern hardwood forest stands by quantifying fine root biomass and growth after 5–7 years of treatment in a nitrogen (N) x phosphorus (P) factorial addition experiment. We quantified root responses at two different levels of treatment: the whole-plot scale fertilization and small-patch scale fertilization of ingrowth cores. Fine root biomass was higher in plots receiving P, and fine root growth was highest in plots receiving both N and P. Thus, belowground productivity did not decrease in response to long-term addition of nutrients. We did not find conclusive evidence that elevated availability of one nutrient at the plot scale induced foraging for the other nutrient at the core scale, or that foraging for nutrients at the core scale responded to addition of limiting nutrients. Our observations suggest NP co-limitation of fine root growth and indicate complex interactions of N and P affecting aboveground and belowground production in early successional northern hardwood forest ecosystems.

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Data Availability

Data from this manuscript are available at: fine root ingrowth and biomass: https://doi.org/10.6073/pasta/c51516c8eca9071862db5becec0f4542woody production: https://doi.org/10.6073/pasta/377b1fd44bd88a58e9654ab207e50706leaf litterfall: https://doi.org/10.6073/pasta/8b2975a3a02cbcfb1b0a12ac954576d4 resin available nutrients: https://doi.org/10.6073/pasta/e842c6704690be8e041da48a778583e3soil respiration: https://doi.org/10.6073/pasta/eb37cd72ccaa3e9197c461f0c1c734eb.

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Acknowledgements

This research was supported by the NSF Long-Term Ecological Research Program (DEB-1114804) and by NSF (DEB-0949317) and the USDA National Institute of Food and Agriculture (2019-67019-29464). Geoff Wilson and Natalie Cleavitt assisted in field sampling and lab processing, and Erika Mudrak from Cornell Statistical Consulting Unit helped with data analysis. We are also grateful for the cooperation and support of the U.S Forest Service Northern Research Station and the Bartlett Experimental Forest. This project is a contribution to the Hubbard Brook Ecosystem Study.

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Correspondence to Timothy J. Fahey.

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Author Contributions

TJF, MCF, RDY, and SL designed the study. SL and TJF collected the data. SL performed analyses and drafted the manuscript, and TJF, MCF, and RDY contributed substantially to writing and revisions.

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Li, S., Fisk, M.C., Yanai, R.D. et al. Co-limitation of Fine Root Growth by Nitrogen and Phosphorus in Early Successional Northern Hardwood Forests. Ecosystems 27, 33–44 (2024). https://doi.org/10.1007/s10021-023-00869-7

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  • DOI: https://doi.org/10.1007/s10021-023-00869-7

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