Characteristics of soil CO2 efflux variability in an aseasonal tropical rainforest in Borneo Island

Mizue Ohashi, Tomo'omi Kumagai, Tomonori Kume, Koichiro Gyokusen, Taku M. Saitoh, Masakazu Suzuki

研究成果: ジャーナルへの寄稿記事

38 引用 (Scopus)

抄録

Although soil carbon dioxide (CO2) efflux from tropical forests may play an important role in global carbon (C) balance, our knowledge of the fluctuations and factors controlling soil CO2 efflux in the Asian tropics is still poor. This study characterizes the temporal and spatial variability in soil CO2 efflux in relation to temperature/moisture content and estimates annual efflux from the forest floor in an aseasonal intact tropical rainforest in Sarawak, Malaysia. Soil CO2 efflux varied widely in space; the range of variation averaged 17.4 μmol m-2 s-1 in total. While most CO2 flux rates were under 10 μmol m-2 s-1, exceptionally high fluxes were observed sporadically at several sampling points. Semivariogram analysis revealed little spatial dependence in soil CO2 efflux. Temperature explained nearly half of the spatial heterogeneity, but the effect varied with time. Seasonal variation in CO2 efflux had no fixed pattern, but was significantly correlated with soil moisture content. The correlation coefficient with soil moisture content (SMC) at 30 and 60 cm depth was higher than at 10 cm depths. The annual soil CO2 efflux, estimated from the relationship between CO2 efflux and SMC at 30 cm depth, was 165 mol m-2 year-1 (1,986 g C m-2 year-1). As this area is known to suffer severe drought every 4-5 years caused by the El Nino-Southern Oscillation, the results suggest that an unpredictable dry period might affect soil CO2 efflux, leading an annual variation in soil C balance.

元の言語英語
ページ(範囲)275-289
ページ数15
ジャーナルBiogeochemistry
90
発行部数3
DOI
出版物ステータス出版済み - 9 1 2008

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rainforest
Soils
moisture content
Soil moisture
Moisture
soil
soil moisture
Fluxes
Tropics
forest floor
soil carbon
Drought
El Nino-Southern Oscillation
tropical forest
annual variation
Carbon Dioxide
seasonal variation
carbon dioxide
temperature
drought

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Water Science and Technology
  • Earth-Surface Processes

これを引用

Characteristics of soil CO2 efflux variability in an aseasonal tropical rainforest in Borneo Island. / Ohashi, Mizue; Kumagai, Tomo'omi; Kume, Tomonori; Gyokusen, Koichiro; Saitoh, Taku M.; Suzuki, Masakazu.

:: Biogeochemistry, 巻 90, 番号 3, 01.09.2008, p. 275-289.

研究成果: ジャーナルへの寄稿記事

Ohashi, Mizue ; Kumagai, Tomo'omi ; Kume, Tomonori ; Gyokusen, Koichiro ; Saitoh, Taku M. ; Suzuki, Masakazu. / Characteristics of soil CO2 efflux variability in an aseasonal tropical rainforest in Borneo Island. :: Biogeochemistry. 2008 ; 巻 90, 番号 3. pp. 275-289.
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