Abstract
Tropical peat swamp forests, which are predominantly located in Southeast Asia (SEA) and play a prominent role as a global carbon store, are being intensively degraded and converted to agricultural lands and tree plantations. For national inventories, updated estimates of peat emissions of greenhouse gases (GHG) from land use (LU) and land-use change in the tropics are required. In this context, we reviewed the scientific literature and calculated emission factors of peat net emissions of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) in seven representative LU categories for SEA i.e. intact peat swamp forest, degraded forest (logged, drained and affected by fire), mixed croplands and shrublands, rice fields, oil palm, Acacia crassicarpa and sago palm plantations. Peat net CO2 uptake from or emissions to the atmosphere were assessed using a mass balance approach. The balance included main peat C inputs through litterfall and root mortality and outputs via organic matter mineralization and dissolved organic carbon. Peat net CO2 loss rate from degraded forest, croplands and shrublands, rice fields, oil palm, A. crassicarpa and sago palm plantations amounted to 19.4 ± 9.4, 41.0 ± 6.7, 25.6 ± 11.5, 29.9 ± 10.6, 71.8 ± 12.7 and 5.2 ± 5.1 Mg CO2 ha−1 y−1, respectively. Total peat GHG losses amounted to 20.9 ± 9.4, 43.8 ± 6.8, 36.1 ± 12.9, 30.4 ± 10.6, 72 ± 12.8 and 8.6 ± 5.3 Mg CO2-equivalent ha−1 y−1 in the same LU categories, respectively. A single land-clearing fire would result in additional emissions of 493.6 ± 156.0 Mg CO2-equivalent ha−1.
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Acknowledgments
This research was generously supported by the contributions of the governments of Australia (Grant Agreement # 46167), Norway (Grant Agreement #QZA-10/0468) and the European Community's Seventh Framework Programme [FP7/2007-2013] (Grant Agreement # 226310) to the Center for International Forestry Research. This work was carried out as part of the Consultative Group on International Agricultural Research programs on Trees, Forests and Agroforestry (CRP6) and Climate Change, Agriculture and Food Security (CCAFS). We would like to thank all researchers that kindly provided support, comments or recommendations, notably Bruno Locatelli; as well as the organizers of the writing workshop of the REDD-ALERT project. The constructive comments of the anonymous reviewers greatly improved the manuscript and are much appreciated.
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Hergoualc’h, K., Verchot, L.V. Greenhouse gas emission factors for land use and land-use change in Southeast Asian peatlands. Mitig Adapt Strateg Glob Change 19, 789–807 (2014). https://doi.org/10.1007/s11027-013-9511-x
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DOI: https://doi.org/10.1007/s11027-013-9511-x