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


    研究成果: Article査読

    17 被引用数 (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.

    ジャーナルJournal of Plant Research
    出版ステータスPublished - 2010 1月

    ASJC Scopus subject areas

    • 植物科学


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