Seasonal shift in factors controlling net ecosystem production in a high Arctic terrestrial ecosystem

Masaki Uchida*, Ayaka Kishimoto, Hiroyuki Muraoka, Takayuki Nakatsubo, Hiroshi Kanda, Hiroshi Koizumi

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)


    We examined factors controlling temporal changes in net ecosystem production (NEP) in a high Arctic polar semi-desert ecosystem in the snow-free season. We examined the relationships between NEP and biotic and abiotic factors in a dominant plant community (Salix polaris-moss) in the Norwegian high Arctic. Just after snowmelt in early July, the ecosystem released CO2 into the atmosphere. A few days after snowmelt, however, the ecosystem became a CO2 sink as the leaves of S. polaris developed. Diurnal changes in NEP mirrored changes in light incidence (photosynthetic photon flux density, PPFD) in summer. NEP was significantly correlated with PPFD when S. polaris had fully developed leaves, i. e., high photosynthetic activity. In autumn, NEP values decreased as S. polaris underwent senescence. During this time, CO2 was sometimes released into the atmosphere. In wet conditions, moss made a larger contribution to NEP. In fact, the water content of the moss regulated NEP during autumn. Our results indicate that the main factors controlling NEP in summer are coverage and growth of S. polaris, PPFD, and precipitation. In autumn, the main factor controlling NEP is moss water content.

    Original languageEnglish
    Pages (from-to)79-85
    Number of pages7
    JournalJournal of Plant Research
    Issue number1
    Publication statusPublished - 2010 Jan


    • Carbon dioxide
    • Climate change
    • High Arctic
    • Moss
    • Net ecosystem production
    • Salix polaris

    ASJC Scopus subject areas

    • Plant Science


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