Journal of Plant Research

, Volume 123, Issue 4, pp 519–530

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

  • Deepa Dhital
  • Yuichiro Yashiro
  • Toshiyuki Ohtsuka
  • Hibiki Noda
  • Yoko Shizu
  • Hiroshi Koizumi
JPR Symposium Carbon cycle process in East Asia

DOI: 10.1007/s10265-009-0289-6

Cite this article as:
Dhital, D., Yashiro, Y., Ohtsuka, T. et al. J Plant Res (2010) 123: 519. doi:10.1007/s10265-009-0289-6

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.

Keywords

Carbon budget Fecal input Heterotrophic respiration Soil CO2 flux Zoysia japonica grassland 

Copyright information

© The Botanical Society of Japan and Springer 2009

Authors and Affiliations

  • Deepa Dhital
    • 1
  • Yuichiro Yashiro
    • 1
  • Toshiyuki Ohtsuka
    • 1
  • Hibiki Noda
    • 1
  • Yoko Shizu
    • 1
  • Hiroshi Koizumi
    • 2
  1. 1.River Basin Research CenterGifu UniversityGifuJapan
  2. 2.Faculty of Education and Integrated Arts and SciencesWaseda UniversityShinjukuJapan

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