Tree species with conservative foliar nutrient status and strong phosphorus homeostasis are regionally abundant in subtropical forests

Hang Ci, Chao Guo, Bin Tuo, Li Ting Zheng, Ming Shan Xu, Bi Le Sai, Bai Yu Yang, Yong Chuan Yang, Wen Hui You*, En Rong Yan, Johannes H.C. Cornelissen

*Corresponding author for this work

    Research output: Contribution to JournalArticleAcademicpeer-review

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    Abstract

    Foliar nitrogen (N) or phosphorus (P) status and their stoichiometric homeostasis are integral parts of the plant nutrient economy that determines the success of plant species in environments where N or P limits plant growth. Despite growing evidence for higher predictability of stoichiometric homeostasis of N (HN) than that of P (HP) on plant species abundance in temperate grasslands, no previous studies explicitly examined how foliar N and P status modulate the relationships between stoichiometric homeostasis and species distribution (regional species abundance) of woody plants, especially in P-limited (sub)tropical ecosystems. We hypothesized that species with a conservative foliar nutrient status but a higher HP (but not HN) would be regional abundant in P-limited forest. We measured foliar N (LNC) and P (LPC) contents of 54 woody species, community composition and soil N and P contents across 94 forest plots in Chinese subtropical forests. Then we evaluated the species' levels of N and P stoichiometric homeostasis and their regional abundance to test our hypotheses. HN and HP significantly increased with decreasing LNC and LPC. Foliar nutrient status positively correlated with the minimum values of both soil N and P contents, but only negatively associated with the maximum value of soil P content, indicating that conservative species can occupy a wider range of soil P- than N-based nutrient niche. Meanwhile, species abundance negatively correlated with LNC and LPC, and positively correlated with HN and HP. However, the structure equation model analysis showed that species abundance increased with decline of LNC but not yet with increased HN. In contrast, species abundance enhanced with increased HP and decreased LPC via HP, rather than directly with a decline of LPC. Synthesis. This study provides empirical evidence that species with conservative foliar nutrient status are more stable in terms of N and P stoichiometric homeostasis, and foliar N and P economy modulate species abundance distribution in different ways. Our results suggest that maintaining strong stoichiometric homeostasis of leaf P, while maintaining conservative economy of N, is a key physiochemical mechanism for shaping species abundance distribution in P-limited forests.

    Original languageEnglish
    Pages (from-to)1497-1507
    Number of pages11
    JournalJournal of Ecology
    Volume110
    Issue number7
    Early online date12 May 2022
    DOIs
    Publication statusPublished - Jul 2022

    Bibliographical note

    Funding Information:
    The authors thank Xiangyu Liu, Danni Zhu, Junyang Cheng, Yantao Zhao, Liuli Zhou, Fang Yin, Tonghui Yang, Yanjun Song and Arshad Ali for their assistance for measuring plant and soil nutrients and investigating community composition. This study was supported by the State Key Program of National Natural Science Foundation of China (Grant Nos. 32030068).

    Publisher Copyright:
    © 2022 The Authors. Journal of Ecology © 2022 British Ecological Society.

    Funding

    The authors thank Xiangyu Liu, Danni Zhu, Junyang Cheng, Yantao Zhao, Liuli Zhou, Fang Yin, Tonghui Yang, Yanjun Song and Arshad Ali for their assistance for measuring plant and soil nutrients and investigating community composition. This study was supported by the State Key Program of National Natural Science Foundation of China (Grant Nos. 32030068).

    FundersFunder number
    National Natural Science Foundation of China32030068
    National Natural Science Foundation of China

      Keywords

      • Foliar nutrient status
      • N:P ratio
      • nutrient limitation
      • plant nutrient economy
      • soil nutrient gradient
      • species abundance
      • stoichiometric homeostasis

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