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

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...

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Bibliographic Details
Published in:Journal of plant research 2010-07, Vol.123 (4), p.519-530
Main Authors: Dhital, Deepa, Yashiro, Yuichiro, Ohtsuka, Toshiyuki, Noda, Hibiki, Shizu, Yoko, Koizumi, Hiroshi
Format: Article
Language:English
Subjects:
Animals
Biomass
Biomedical and Life Sciences
Carbon - metabolism
Carbon budget
Carbon cycle
Carbon Dioxide - metabolism
Cattle
Cell Respiration
Ecosystem
Fecal input
Feces
Grasslands
Heterotrophic respiration
Japan
JPR Symposium
Life Sciences
Plant Biochemistry
Plant Ecology
Plant Physiology
Plant Roots - cytology
Plant Roots - metabolism
Plant Sciences
Poaceae - growth & development
Poaceae - metabolism
Rain
Seasons
Soil - analysis
Soil CO₂ flux
Soil sciences
Temperature
Terrestrial ecosystems
Zoysia japonica grassland
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Summary: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.
ISSN:0918-9440
1618-0860
DOI:10.1007/s10265-009-0289-6