Inversely estimating the vertical profile of the soil CO2 production rate in a deciduous broadleaf forest using a particle filtering method

Gen Sakurai, Seiichiro Yonemura, Ayaka W. Kishimoto-Mo, Shohei Murayama, Toshiyuki Ohtsuka, Masayuki Yokosawa

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Carbon dioxide (CO2) efflux from the soil surface, which is a major source of CO2 from terrestrial ecosystems, represents the total CO2 production at all soil depths. Although many studies have estimated the vertical profile of the CO2 production rate, one of the difficulties in estimating the vertical profile is measuring diffusion coefficients of CO2 at all soil depths in a nondestructive manner. In this study, we estimated the temporal variation in the vertical profile of the CO2 production rate using a data assimilation method, the particle filtering method, in which the diffusion coefficients of CO2 were simultaneously estimated. The CO2 concentrations at several soil depths and CO2 efflux from the soil surface (only during the snow-free period) were measured at two points in a broadleaf forest in Japan, and the data were assimilated into a simple model including a diffusion equation. We found that there were large variations in the pattern of the vertical profile of the CO2 production rate between experiment sites: the peak CO2 production rate was at soil depths around 10 cm during the snow-free period at one site, but the peak was at the soil surface at the other site. Using this method to estimate the CO2 production rate during snow-cover periods allowed us to estimate CO2 efflux during that period as well. We estimated that the CO2 efflux during the snow-cover period (about half the year) accounted for around 13% of the annual CO2 efflux at this site. Although the method proposed in this study does not ensure the validity of the estimated diffusion coefficients and CO2 production rates, the method enables us to more closely approach the "actual" values by decreasing the variance of the posterior distribution of the values.

Original languageEnglish
Article numbere0119001
JournalPLoS One
Volume10
Issue number3
DOIs
Publication statusPublished - 2015 Mar 20
Externally publishedYes

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soil profiles
Soil
carbon dioxide
Snow
Soils
methodology
soil depth
diffusivity
snowpack
Forests
Carbon Dioxide
Ecosystems
Ecosystem
snow
Japan
soil
temporal variation
Experiments

ASJC Scopus subject areas

  • Medicine(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Cite this

Inversely estimating the vertical profile of the soil CO2 production rate in a deciduous broadleaf forest using a particle filtering method. / Sakurai, Gen; Yonemura, Seiichiro; Kishimoto-Mo, Ayaka W.; Murayama, Shohei; Ohtsuka, Toshiyuki; Yokosawa, Masayuki.

In: PLoS One, Vol. 10, No. 3, e0119001, 20.03.2015.

Research output: Contribution to journalArticle

Sakurai, Gen ; Yonemura, Seiichiro ; Kishimoto-Mo, Ayaka W. ; Murayama, Shohei ; Ohtsuka, Toshiyuki ; Yokosawa, Masayuki. / Inversely estimating the vertical profile of the soil CO2 production rate in a deciduous broadleaf forest using a particle filtering method. In: PLoS One. 2015 ; Vol. 10, No. 3.
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