PARIS — Satellite images have found that Indonesia's ancient forests, a cradle of biodiversity and a buffer against climate change, have shrunk much faster than thought, scientists said on Sunday.
Between 2000 and 2012, Indonesia lost around 6.02 million ha of primary forest, an area almost the size of Sri Lanka, they reported.
Primary or ancient forests are distinguished from managed forests, which are plantations of trees grown for timber and pulp.
The researchers found that primary forest loss accelerated during the period under review, reaching an annual 840,000 ha by 2012 – nearly twice the deforestation rate of Brazil, which was 460,000 ha in the same year.
"Indonesia's forests contain high floral and faunal biodiversity, including 10 per cent of the world's plants, 12 per cent of the world's mammals, 16 per cent of the world's reptile-amphibians and 17 per cent of the world's bird species," said the study, published in the journal Nature Climate Change.
"Extensive clearing of Indonesian primary forest cover directly results in habitat loss and associated plant and animal extinctions."
Deforestation is also a blow to the fight against climate change, as ancient trees store more carbon emissions from the atmosphere than new ones do, and for a longer period, thus mitigating global warming.
The research, led by geographer Belinda Margono of the University of Maryland, looked at long-term satellite images.
During 2000-2012, total forest cover in Indonesia retreated by 15.79 million ha, of which 6.02 million, or 38 per cent, was primary forest, the investigation found.
Distinguishing between primary and managed forest is vital in the campaign to preserve biodiversity and combat climate change, the paper said.
"It is critically important to know the context of forest disturbance, whether of a high-biomass natural forest or a short-cycle plantation," it said.
"Similarly, the clearing of natural forest has very different implications on the maintenance of biodiversity richness."
It noted that in 2010, the UN's Food and Agricultural Organisation (FAO) put Indonesia's overall forest loss at 310,000 ha per year from 2000-2005, and 690,000 ha annually from 2005-2010.
Indonesia itself, in a report to the UN's Framework Convention on Climate Change (UNFCCC) in 2009, estimated forest loss of 1.1 million ha annually from 2000-2005.
Margono's study found the biggest losers were lowland and wetland forests in Sumatra and Kalimantan, where trees are typically chopped down by loggers for use in farming. — AFP