Estimating the Relative Contributions of Root Respiration and Peat Decomposition to the Total CO₂ Flux from Peat Soil at an Oil Palm Plantation in Sumatra, Indonesia

• SABIHAM Supiandi

  Department of Soil Science and Land Resource, Institut Pertanian Bogor

• MARWANTO Setiari

  IndonesianSoil Research Institute

• WATANABE Tetsuhiro

  Graduate School of Agriculture, Kyoto University

• FUNAKAWA Shinya

  Graduate School of Agriculture, Kyoto University

• SUDADI Untung

  Department of Soil Science and Land Resource, Institut Pertanian Bogor

• AGUS Fahmuddin

  IndonesianSoil Research Institute

抄録

The decomposition of organic matter influences CO₂ flux in peat soils. However, determination of the flux from the decomposition process is usually over-estimated because the total CO₂ flux calculation includes root respiration. We clarified this issue addressing the following aims: (i) to study the relation of oil palm root distribution in peat soils to the flux and (ii) to estimate the relative contribution of root respiration and peat decomposition to the total CO₂ flux. The study was conducted between January and June 2012. In the research area, three transects were established perpendicular to drainage channels, where nine14-year-old oil palm trees were selected and used as observation sites. Eight closed chambers were established as observation points at each site. We measured CO₂ flux at each point using an Infra Red Gas Analyzer (IRGA). Root and peat samples were collected from each observation point to measure root density and analyze peat chemical properties. Our results showed that the pH_H2O and nutrient content of P, K, Ca and Mg in the peat soils significantly increased of CO₂ flux. Oil palm roots at depths of 0–15 and 15–30 cm nearest the tree showed the highest density, while root densities gradually decreased with increasing distance from the tree. CO₂ flux in the peat soils nearest to the tree were highest at 0.44 ± 0.23 mg CO₂ m^-2 sec^-1 (or 137.7 ± 73.4 t CO₂ ha^-1 yr ^-1). CO₂ flux significantly decreased with increasing distance from the tree, showing the lowest value of 0.10 ± 0.04 mg CO₂ m^-2 sec^-1 (or 30.67 ± 12.4 t CO₂ ha^-1 yr ^-1). We conclude that the CO₂ flux was derived from peat decomposition and root respiration. Using the integral equation approach, the relative contribution of root respiration and peat decomposition was 74 and 26%, respectively to the total CO₂ flux.

収録刊行物

• Tropical Agriculture and Development

  Tropical Agriculture and Development 58 (3), 87-93, 2014

  日本熱帯農業学会

キーワード

• CO<SUB>2</SUB> flux
• Oil palm plantation
• Peat decomposition
• Peat soil
• Root respiration

詳細情報

• CRID: 1390001205296802688
• NII論文ID: 130005091249
• DOI: 10.11248/jsta.58.87
• ISSN: 18828469
• ISSN: 18828450
• 本文言語コード: en
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可