Contribution of soil moisture to seasonal and annual variations of soil CO2 efflux in a humid cool-temperate oak-birch forest in central Japan

Ayaka Wenhong Kishimoto-Mo, Seiichiro Yonemura, Masaki Uchida, Miyuki Kondo, Shohei Murayama, Hiroshi Koizumi

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    To quantify the contribution of soil moisture to seasonal and annual variations in soil CO2 efflux in a cool-humid deciduous broadleaf forest, we measured soil CO2 efflux during the snow-free seasons of 2005–2008 using an automated chamber technique. This worked much better than manual chambers employing the same steady-state through-flow method. Soil CO2 efflux (g C m−2period−1) during the snow-free season ranged from 979.8 ± 49.0 in 2005 to 1131.2 ± 56.6 in 2008 with a coefficient variation of 6.4 % among the 4 years. We established two-parameter (soil temperature and moisture) empirical models, finding that while soil temperature and moisture explained 69–86 % and 10–13 % of the temporal variability, respectively. Soil moisture had the effect of modifying the temporal variability of soil CO2 efflux, particularly during summer and early fall after episodic rainfall events; greater soil moisture enhanced soil CO2 efflux in the surface soil layers. High soil moisture conditions did not suppress soil CO2 efflux, leading to a positive correlation between normalized soil CO2 efflux (ratio of the measured to predicted efflux using a temperature-dependent Q10 function) and soil moisture. Therefore, enhanced daily soil CO2 efflux following heavy rainfall events could significantly reduce net ecosystem exchange (i.e. daily net ecosystem production) by 32 % on some days. Our results highlight the importance of precisely estimating the response of soil CO2 efflux to changes in soil moisture following rainfall events when modeling seasonal carbon dynamics in response to climate change, even in humid monsoon regions.

    Original languageEnglish
    Pages (from-to)311-325
    Number of pages15
    JournalEcological Research
    Volume30
    Issue number2
    DOIs
    Publication statusPublished - 2015

    Fingerprint

    Betula
    annual variation
    Quercus
    seasonal variation
    soil moisture
    soil water
    Japan
    soil
    rain
    snow
    soil temperature
    rainfall
    net ecosystem exchange
    net ecosystem production
    soil surface layers
    oak
    soil heterogeneity
    deciduous forest
    climate change
    monsoon

    Keywords

    • Automated soil respiration chambers
    • Empirical model
    • Open-flow IRGA method
    • Rainfall
    • Soil respiration

    ASJC Scopus subject areas

    • Ecology, Evolution, Behavior and Systematics

    Cite this

    Contribution of soil moisture to seasonal and annual variations of soil CO2 efflux in a humid cool-temperate oak-birch forest in central Japan. / Kishimoto-Mo, Ayaka Wenhong; Yonemura, Seiichiro; Uchida, Masaki; Kondo, Miyuki; Murayama, Shohei; Koizumi, Hiroshi.

    In: Ecological Research, Vol. 30, No. 2, 2015, p. 311-325.

    Research output: Contribution to journalArticle

    Kishimoto-Mo, Ayaka Wenhong ; Yonemura, Seiichiro ; Uchida, Masaki ; Kondo, Miyuki ; Murayama, Shohei ; Koizumi, Hiroshi. / Contribution of soil moisture to seasonal and annual variations of soil CO2 efflux in a humid cool-temperate oak-birch forest in central Japan. In: Ecological Research. 2015 ; Vol. 30, No. 2. pp. 311-325.
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