Carbon dynamics and budget in a Zoysia japonica grassland, central Japan

Deepa Dhital, Yuichiro Yashiro, Toshiyuki Ohtsuka, Hibiki Noda, Yoko Shizu, Hiroshi Koizumi

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    14 Citations (Scopus)

    Abstract

    The ecosystem carbon budget was estimated in a Japanese Zoysia japonica grassland. The green biomass started to grow in May and peaked from mid-July to September. Seasonal variations in soil CO2 flux and root respiration were mediated by changes in soil temperature. Annual soil CO2 flux was 1,121.4 and 1,213.6 g C m-2 and root respiration was 471.0 and 544.3 g C m-2 in 2007 and 2008, respectively. The root respiration contribution to soil CO2 flux ranged from 33% to 71%. During the growing season, net primary production (NPP) was 747.5 and 770.1 g C m-2 in 2007 and 2008, respectively. The biomass removed by livestock grazing (GL) was 122.1 and 102.7 g C m-2, and the livestock returned 28.2 and 25.6 g C m-2 as fecal input (FI) in 2007 and 2008, respectively. The decomposition of FI (DL, the dry weight loss due to decomposition) was very low, 1.5 and 1.4 g C m-2, in 2007 and 2008. Based on the values of annual NPP, soil CO2 flux, root respiration, GL, FI, and DL, the estimated carbon budget of the grassland was 1.7 and 22.3 g C m-2 in 2007 and 2008, respectively. Thus, the carbon budget of this Z. japonica grassland ecosystem remained in equilibrium with the atmosphere under current grazing conditions over the 2 years of the study.

    Original languageEnglish
    Pages (from-to)519-530
    Number of pages12
    JournalJournal of Plant Research
    Volume123
    Issue number4
    DOIs
    Publication statusPublished - 2010

    Keywords

    • Carbon budget
    • Fecal input
    • Heterotrophic respiration
    • Soil CO flux
    • Zoysia japonica grassland

    ASJC Scopus subject areas

    • Plant Science

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    Dhital, D., Yashiro, Y., Ohtsuka, T., Noda, H., Shizu, Y., & Koizumi, H. (2010). Carbon dynamics and budget in a Zoysia japonica grassland, central Japan. Journal of Plant Research, 123(4), 519-530. https://doi.org/10.1007/s10265-009-0289-6