Determination of tropical deforestation rates and related carbon losses from 1990 to 2010

Global Change Biology - Tập 20 Số 8 - Trang 2540-2554 - 2014
Frédéric Achard1, René Beuchle1, Philippe Mayaux1, Hans‐Jürgen Stibig1, Catherine Bodart2,1, Andreas Brink1, Silvia Carboni3, Baudouin Desclée1, François Donnay3, Hugh Eva1, Andrea Lupi4, Rastislav Raši1,5, Roman Seliger3, Dario Simonetti4
1Institute for Environment and Sustainability, Joint Research Centre of the European Commission, TP 440, Ispra, VA, 21027 Italy
2Food and Agriculture Organisation of the United Nations, Rome, Italy
3Joint Research Centre of the European Commission, Engineering SpA, Ispra, Italy
4Arcadia SIT, Joint Research Centre of the European Commission, Ispra, Italy
5National Forest Centre, Forest Research Institute, Zvolen, 96092 Slovak Republic

Tóm tắt

AbstractWe estimate changes in forest cover (deforestation and forest regrowth) in the tropics for the two last decades (1990–2000 and 2000–2010) based on a sample of 4000 units of 10 ×10 km size. Forest cover is interpreted from satellite imagery at 30 × 30 m resolution. Forest cover changes are then combined with pan‐tropical biomass maps to estimate carbon losses. We show that there was a gross loss of tropical forests of 8.0 million ha yr−1 in the 1990s and 7.6 million ha yr−1 in the 2000s (0.49% annual rate), with no statistically significant difference. Humid forests account for 64% of the total forest cover in 2010 and 54% of the net forest loss during second study decade. Losses of forest cover and Other Wooded Land (OWL) cover result in estimates of carbon losses which are similar for 1990s and 2000s at 887 MtC yr−1 (range: 646–1238) and 880 MtC yr−1 (range: 602–1237) respectively, with humid regions contributing two‐thirds. The estimates of forest area changes have small statistical standard errors due to large sample size. We also reduce uncertainties of previous estimates of carbon losses and removals. Our estimates of forest area change are significantly lower as compared to national survey data. We reconcile recent low estimates of carbon emissions from tropical deforestation for early 2000s and show that carbon loss rates did not change between the two last decades. Carbon losses from deforestation represent circa 10% of Carbon emissions from fossil fuel combustion and cement production during the last decade (2000–2010). Our estimates of annual removals of carbon from forest regrowth at 115 MtC yr−1 (range: 61–168) and 97 MtC yr−1 (53–141) for the 1990s and 2000s respectively are five to fifteen times lower than earlier published estimates.

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Global Change Biology

Tập 20 Số 8

2540-2554

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