Carbon dioxide exchange in a cool-temperate evergreen coniferous forest over complex topography in Japan during two years with contrasting climates

Taku M. Saitoh, Ichiro Tamagawa, Hiroyuki Muraoka, Na Yeon M Lee, Yuichiro Yashiro, Hiroshi Koizumi

    Research output: Contribution to journalArticle

    21 Citations (Scopus)

    Abstract

    We investigated carbon dioxide (CO2) exchange and its environmental response during two years with contrasting climate (2006 and 2007) in a cool-temperate mixed evergreen coniferous forest dominated by Japanese cedar (Cryptomeria japonica) and Japanese cypress (Chamaecyparis obtusa). The study, which was conducted in a mountainous region of central Japan, used the eddy-covariance technique. Our results (crosschecked using the common u* approach and van Gorsel's alternative approach) showed that annual gross primary production (GPP) and ecosystem respiration (RE) were at least 6% higher in the dry year than in the wet year, whereas net ecosystem exchange (NEE) was similar in both years. Without soil water stress, strong light stress or seasonality of plant area index during most of the study period, the forest had high metabolic activity. GPP and RE differed greatly between the two years, especially in spring (April-May) and summer (July-September), respectively. The spring GPP difference (>20%) was influenced by different winter air temperatures and snow melt timing, which controlled photosynthetic capacity in spring, and by different spring light intensities. The annual NEE differed depending on the evaluation method used, but the mean 2-year NEE estimated by the u* threshold approach [-3.39 ± 0. 11 (SD) MgC ha-1 year-1] appears more reasonable in comparison with results from other forests.

    Original languageEnglish
    Pages (from-to)473-483
    Number of pages11
    JournalJournal of Plant Research
    Volume123
    Issue number4
    DOIs
    Publication statusPublished - 2010

    Fingerprint

    net ecosystem exchange
    coniferous forests
    topography
    carbon dioxide
    Japan
    climate
    primary productivity
    Cryptomeria japonica
    Chamaecyparis obtusa
    ecosystem respiration
    eddy covariance
    cell respiration
    snow
    light intensity
    air temperature
    water stress
    soil water
    winter
    summer
    methodology

    Keywords

    • AsiaFlux TKC site
    • Eddy-covariance
    • Environmental response of CO flux
    • Japanese cedar
    • Japanese cypress
    • Mountainous region

    ASJC Scopus subject areas

    • Plant Science

    Cite this

    Carbon dioxide exchange in a cool-temperate evergreen coniferous forest over complex topography in Japan during two years with contrasting climates. / Saitoh, Taku M.; Tamagawa, Ichiro; Muraoka, Hiroyuki; Lee, Na Yeon M; Yashiro, Yuichiro; Koizumi, Hiroshi.

    In: Journal of Plant Research, Vol. 123, No. 4, 2010, p. 473-483.

    Research output: Contribution to journalArticle

    Saitoh, Taku M. ; Tamagawa, Ichiro ; Muraoka, Hiroyuki ; Lee, Na Yeon M ; Yashiro, Yuichiro ; Koizumi, Hiroshi. / Carbon dioxide exchange in a cool-temperate evergreen coniferous forest over complex topography in Japan during two years with contrasting climates. In: Journal of Plant Research. 2010 ; Vol. 123, No. 4. pp. 473-483.
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