Costs of acquiring phosphorus by vascular land plants: patterns and implications for plant coexistence

John A. Raven (Lead / Corresponding author), Hans Lambers, Sally E. Smith, Mark Westoby

    Research output: Contribution to journalReview article

    40 Citations (Scopus)

    Abstract

    We compare carbon (and hence energy) costs of the different modes of phosphorus (P) acquisition by vascular land plants. Phosphorus-acquisition modes are considered to be mechanisms of plants together with their root symbionts and structures such as cluster roots involved in mobilising or absorbing P. Phosphorus sources considered are soluble and insoluble inorganic and organic pools. Costs include operating the P-acquisition mechanisms, and resource requirements to construct and maintain them. For most modes, costs increase as the relevant soil P concentration declines. Costs can thus be divided into a component incurred irrespective of soil P concentration, and a component describing how quickly costs increase as the soil P concentration declines. Differences in sensitivity of costs to soil P concentration arise mainly from how economically mycorrhizal fungal hyphae or roots that explore the soil volume are constructed, and from costs of exudates that hydrolyse or mobilise insoluble P forms. In general, modes of acquisition requiring least carbon at high soil P concentrations experience a steeper increase in costs as soil P concentrations decline. The relationships between costs and concentrations suggest some reasons why different modes coexist, and why the mixture of acquisition modes differs between sites.

    Original languageEnglish
    Pages (from-to)1420-1427
    Number of pages8
    JournalNew Phytologist
    Volume217
    Issue number4
    Early online date2 Jan 2018
    DOIs
    Publication statusPublished - 6 Feb 2018

    Keywords

    • Journal article
    • Review
    • Cluster roots
    • mycorrhizas
    • Phosphorus (P)
    • Soil concentration
    • Trade-offs
    • trade-offs
    • soil concentration
    • cluster roots
    • phosphorus (P)

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