Original Research Papers

Soil CO₂ flux from three ecosystems in tropical peatland of Sarawak, Malaysia

Authors

Lulie Melling
Ryusuke Hatano
Kah Joo Goh

Abstract

Soil CO₂ flux was measured monthly over a year from tropical peatland of Sarawak, Malaysia using a closed-chamber technique. The soil CO₂ flux ranged from 100 to 533 mg C m−2 h−1 for the forest ecosystem, 63 to 245 mg C m−2 h−1 for the sago and 46 to 335 mg C m⁻² h⁻¹ for the oil palm. Based on principal component analysis (PCA), the environmental variables over all sites could be classified into three components, namely, climate, soil moisture and soil bulk density, which accounted for 86% of the seasonal variability. A regression tree approach showed that CO₂ flux in each ecosystem was related to different underlying environmental factors. They were relative humidity for forest, soil temperature at 5 cm for sago and water-filled pore space for oil palm. On an annual basis, the soil CO₂ flux was highest in the forest ecosystem with an estimated production of 2.1 kg C m−2 yr−1 followed by oil palm at 1.5 kg C m⁻² yr⁻¹ and sago at 1.1 kg C m⁻² yr⁻¹. The different dominant controlling factors in CO₂ flux among the studied ecosystems suggested that land use affected the exchange of CO₂ between tropical peatland and the atmosphere.

Year: 2005

Volume: 57 Issue: 1

Page/Article: 1-11

DOI: 10.3402/tellusb.v57i1.16772

Submitted on Nov 21, 2003

Accepted on Jun 29, 2004

Published on Jan 1, 2005

Peer Reviewed

CC BY 4.0

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Original Research Papers

Soil CO2 flux from three ecosystems in tropical peatland of Sarawak, Malaysia

Abstract

References

Soil CO₂ flux from three ecosystems in tropical peatland of Sarawak, Malaysia