Soil nitrous oxide and methane fluxes from a land-use change transition of primary forest to oil palm in an Indonesian peatland

Swails Erin, Drewer Julia, Hartill Jodie, Comeau Louis-Pierre, Verchot Louis, Hergoualc'H Kristell Anaïk. 2023. Soil nitrous oxide and methane fluxes from a land-use change transition of primary forest to oil palm in an Indonesian peatland. Biogeochemistry, 19 p.

Url - jeu de données - Entrepôt autre : https://doi.org/10.17528/CIFOR/DATA.00290

Résumé : Despite the documented increase in greenhouse gas (GHG) emissions from Southeast Asian peat swamp forest degradation and conversion to oil palm over recent decades, reliable estimates of emissions of nitrous oxide (N2O) and methane (CH4) are lacking. We measured soil fluxes of N2O and CH4 and their environmental controls along a peatland transition from primary forest (PF) to degraded drained forest (DF) to oil palm plantation (OP) over 18 months in Jambi, Sumatra, Indonesia. Sampling was conducted monthly at all sites and more intensively following two fertilization events in the OP. Mean annual emissions of N2O (kg N ha−1 yr−1) were 1.7 ± 0.2 for the PF, 2.3 ± 0.2 for the DF and for the OP 8.1 ± 0.8 without drainage canals (DC) and 7.7 ± 0.7 including DC. High N2O emissions in the OP were driven by peat decomposition, not by N fertilizer addition. Mean CH4 annual fluxes (kg C ha−1 yr−1) were 8.2 ± 1.9 for the PF, 1.9 ± 0.4 for the DF, and 1.6 ± 0.3 for the OP with DC and 1.1 ± 0.2 without. Considering their 20-year global warming potentials (GWP), the combined non-CO2 GHG emission (Mg CO2-equivalent ha−1 yr−1) was 3.3 ± 0.6 for the PF and 1.6 ± 0.2 for the DF. The emission in the OP (3.8 ± 0.3 with or without DC) was similar to the PF because reductions in CH4 emissions offset N2O increases. However, considering 100-year GWP, the combined non-CO2 GHG emission was larger in the OP (3.4 ± 0.3 with DC and 3.5 ± 0.3 without) compared to both the PF and the DF (1.5 ± 0.2 and 1.2 ± 0.1, respectively). The increase in peat N2O emissions associated with the land-use change transition from primary forest to oil palm plantation at our sites provides further evidence of the urgent need to protect tropical peat swamp forests from drainage and conversion.

Mots-clés Agrovoc : Elaeis guineensis, dégradation de l'environnement, plantation forestière, réduction des émissions, dégradation du sol, dégradation des forêts, gaz à effet de serre, forêt tropicale, fertilisation, fertilité du sol, atténuation des effets du changement climatique, sol tourbeux

Mots-clés géographiques Agrovoc : Indonésie, Sumatra, Asie du Sud-Est

Mots-clés libres : Tropical, Greenhouse Gases, Soil, Drainage, Southeast Asia, Fertilizer

Classification Agris : P33 - Chimie et physique du sol

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Agences de financement hors UE : Government of the United States of America, Government of the Norway, Consortium of International Agricultural Research Centers

Projets sur financement : (USA) Sustainable Wetlands Adaptation and Mitigation Program, (FRA) CGIAR research program on Climate Change, Agriculture and Food Security

Auteurs et affiliations

• Swails Erin, CIFOR (IDN) - auteur correspondant
• Drewer Julia, Centre for Ecology and Hydrology (GBR)
• Hartill Jodie, University of Aberdeen (GBR)
• Comeau Louis-Pierre, Agriculture and Agri-Food Canada (CAN)
• Verchot Louis, CIAT (COL)
• Hergoualc'H Kristell Anaïk, CIRAD-PERSYST-UMR Eco&Sols (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/605923/)

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