Biometric based carbon flux measurements and net ecosystem production (NEP) in a temperate deciduous broad-leaved forest beneath a flux tower

Toshiyuki Ohtsuka, Wenhong Mo, Takami Satomura, Motoko Inatomi, Hiroshi Koizumi

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Biometric based carbon flux measurements were conducted over 5 years (1999-2003) in a temperate deciduous broad-leaved forest of the AsiaFlux network to estimate net ecosystem production (NEP). Biometric based NEP, as measured by the balance between net primary production (including NPP of canopy trees and of forest floor dwarf bamboo) and heterotrophic respiration (RH), clarified the contribution of various biological processes to the ecosystem carbon budget, and also showed where and how the forest is storing C. The mean NPP of the trees was 5.4 ± 1.07 t C ha-1 y-1, including biomass increment (0.3 ± 0.82 t C ha-1 y-1), tree mortality (1.0 ± 0.61 t C ha-1 y-1), aboveground detritus production (2.3 ± 0.39 t C ha-1 y-1) and belowground fine root production (1.8 ± 0.31 t C ha-1 y -1). Annual biomass increment was rather small because of high tree mortality during the 5 years. Total NPP at the site was 6.5 ± 1.07 t C ha-1 y-1, including the NPP of the forest floor community (1.1 ± 0.06 t C ha-1 y-1). The soil surface CO 2 efflux (RS) was averaged across the 5 years of record using open-flow chambers. The mean estimated annual RS amounted to 7.1 ± 0.44 t C ha-1, and the decomposition of soil organic matter (SOM) was estimated at 3.9 ± 0.24 t C ha-1. RH was estimated at 4.4 ± 0.32 t C ha-1 y-1, which included decomposition of coarse woody debris. Biometric NEP in the forest was estimated at 2.1 ± 1.15 t C ha-1 y-1, which agreed well with the eddy-covariance based net ecosystem exchange (NEE). The contribution of woody increment (Δbiomass + mortality) of the canopy trees to NEP was rather small, and thus the SOM pool played an important role in carbon storage in the temperate forest. These results suggested that the dense forest floor of dwarf bamboo might have a critical role in soil carbon sequestration in temperate East Asian deciduous forests.

Original languageEnglish
Pages (from-to)324-334
Number of pages11
JournalEcosystems
Volume10
Issue number2
DOIs
Publication statusPublished - 2007 Mar
Externally publishedYes

Fingerprint

net ecosystem production
broad-leaved forest
biometry
flux measurement
Biometrics
carbon flux
deciduous forest
Ecosystems
Towers
Carbon
forest litter
Fluxes
forest floor
carbon
tree mortality
bamboos
carbon sequestration
bamboo
biomass
soil organic matter

Keywords

  • AsiaFlux
  • Carbon flux
  • Dwarf bamboo
  • Heterotrophic respiration
  • Net ecosystem exchange
  • Net primary production
  • Soil organic matter
  • Soil respiration
  • Temperate deciduous forests

ASJC Scopus subject areas

  • Ecology

Cite this

Biometric based carbon flux measurements and net ecosystem production (NEP) in a temperate deciduous broad-leaved forest beneath a flux tower. / Ohtsuka, Toshiyuki; Mo, Wenhong; Satomura, Takami; Inatomi, Motoko; Koizumi, Hiroshi.

In: Ecosystems, Vol. 10, No. 2, 03.2007, p. 324-334.

Research output: Contribution to journalArticle

Ohtsuka, Toshiyuki ; Mo, Wenhong ; Satomura, Takami ; Inatomi, Motoko ; Koizumi, Hiroshi. / Biometric based carbon flux measurements and net ecosystem production (NEP) in a temperate deciduous broad-leaved forest beneath a flux tower. In: Ecosystems. 2007 ; Vol. 10, No. 2. pp. 324-334.
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