Light interception in species with different functional groups coexisting in moorland plant communities

Chiho Kamiyama, Shimpei Oikawa, Takuya Kubo, Kouki Hikosaka

    Research output: Contribution to journalArticlepeer-review

    20 Citations (Scopus)

    Abstract

    Competition for light is one of the most essential mechanisms affecting species composition. It has been suggested that similar light acquisition efficiency (Φmass, absorbed photon flux per unit aboveground mass) may contribute to species coexistence in multi-species communities. On the other hand, it is known that traits related with light acquisition vary among functional groups. We studied whether Φmass was similar among species with different functional groups coexisting in moorland communities. We conducted stratified clipping in midsummer when the stand biomass reached a maximum. Light partitioning among species was estimated using a model accounting for both direct and diffuse light. Evergreen species were found to have a significantly lower Φmass than deciduous species, which resulted from their lower absorbed photon flux per unit leaf area and lower specific leaf area. Shrubs had a smaller leaf mass fraction, but their Φmass was not lower than that of herbs because they had a higher leaf position due to the presence of wintering stems. Species with vertical leaves had a higher Φmass than those with horizontal leaves despite vertical leaves being a decided disadvantage in terms of light absorption. This higher Φmass was achieved by a greater leaf height in species with vertical leaves. Our results clearly demonstrate that light acquisition efficiency was different among the functional groups. However, the trend observed is not necessarily the same as that expected based on prior knowledge, suggesting that disadvantages in some traits for light acquisition efficiency are partly compensated for by other traits.

    Original languageEnglish
    Pages (from-to)591-599
    Number of pages9
    JournalOecologia
    Volume164
    Issue number3
    DOIs
    Publication statusPublished - 2010

    Keywords

    • Biomass allocation
    • Canopy structure
    • Leaf angle
    • Life form
    • Light partitioning

    ASJC Scopus subject areas

    • Ecology, Evolution, Behavior and Systematics

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