Root- and peat-based CO 2 emissions from oil palm plantations

Ai Dariah (), Setiari Marwanto and Fahmuddin Agus

Mitigation and Adaptation Strategies for Global Change, 2014, vol. 19, issue 6, 843 pages

Abstract: Measured carbon dioxide (CO 2 ) flux from peat soils using the closed chamber technique combines root-related (autotrophic + heterotrophic where rhizosphere organisms are involved) and peat-based (heterotrophic) respiration. The latter contributes to peat loss while the former is linked to recent CO 2 removal through photosynthesis. The objective of this study was to separate root- from peat-based respiration. The study was conducted on peatland under 6 and 15 year old oil palm (Elaeis guineensis Jacq.) plantations in Jambi Province, Indonesia in 2011 to 2012. CO 2 emissions were measured in the field from 25 cm diameter and 25 cm tall closed chambers using an infrared gas analyser. Root sampling and CO 2 emissions measurements were at distances of 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, and 4.5 m from the centre of the base of the palm tree. The emission rate for the six and 15 year old oil palm plantations at ≥3.0 m from the centre of the tree were 38.2 ± 9.5 and 34.1 ± 15.9 Mg CO 2 ha −1 yr −1 , respectively. At distances >2.5 m, total respiration linearly decreased with distances from the trees. Heterotrophic respirations were 86 % of the 44.7 ± 11.2 and 71 % of 47.8 ± 21.3 Mg CO 2 ha −1 yr −1 of weighted surface flux, respectively for the 6 and 15 year old plantations. We propose that CO 2 flux measurements in oil palm plantations made at a distance of ≥3 m from the tree centre be used to represent the heterotrophic respiration that is relevant for the environmental impact assessment. Copyright Springer Science+Business Media Dordrecht 2014

Keywords: Autotrophic respiration; Closed chamber; CO 2 flux; Heterotrophic respiration; Infrared Gas Analyser; Root-related respiration (search for similar items in EconPapers)
Date: 2014
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DOI: 10.1007/s11027-013-9515-6

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