Forest cover

Seuon Roan (left) and his village fellow at the cleared land where his resin trees once stood, in O Preah village, Kratie province.  Photograph by Oxfam GB Asia, taken on 1 January 2001. Licensed under CC BY-NC-ND 2.0

Seuon Roan (left) and his village fellow at the cleared land where his resin trees once stood, in O Preah village, Kratie province. Photograph by Oxfam GB Asia, taken on 1 January 2000. Licensed under CC BY-NC-ND 2.0

Cambodian forest cover has reduced dramatically in recent decades. In 1973 there were 13.1 million hectares of total forest, but by 2014 the total cover had fallen to 8.7 million hectares. For the first time in the 41-year period, the percentage of non-forest ground cover (48.4%) was larger than that of forest cover (47.7%).1 

Most of the loss was dense forest – old-growth forest, mostly evergreen, largely undisturbed – which fell by more than half, from 7.6 million ha to 3 million ha. That is the equivalent of losing an area of dense forest bigger than an entire country like Denmark.

ODC’s mapping reveals a trend of dense forest loss over the last 41 years in Cambodia, which supports the findings of other groups such as the University of Maryland (Hansen et al)2 and World Wide Fund for Nature (WWF).3 Maps based on the University of Maryland work are available at the Global Forest Watch website.4

Slowing forest losses

Concerns over the dramatic loss of forest cover in Cambodia have been expressed by many organisations and individuals and in many ways. Cambodia’s Millennium Development Goals, for example, include a specific target of maintaining forest cover of at least 60% by 20155 (part of Goal 7). This was not met. As noted above, current forest cover is already much lower, at around 48%.

How forest cover is calculated

Satellite images of Cambodia going back to the 1970s are publicly available. Images on which calculations are based are selected on their quality and the absence of cloud cover. Because there are wet seasons and dry seasons and the land obviously looks greener in the wet season, when images were made during the year also has to be considered for consistency.

The original satellite images contain multiple bands of color. Separating these colors allowed ODC to classify the type of ground cover shown as dense forest, mixed forest, non-forest, water, or cloud. The higher resolution images available in recent years means that the measurement of, for example, dense forest, is more precise today.

The ODC maps are the only forest cover maps produced for Cambodia over this four-decade time scale. In 2006, Cambodia’s Department of Forestry Administration published a map showing forest cover in 2002. Then in 2011, Forestry Administration, supported by the International Tropical Timber Organization and the Government of Denmark, published Cambodia forest cover 2010, which included maps of forest cover change for 2006–2010 and 2002–2010.6 As no official maps or analysis specific to Cambodia have been published since this date, ODC decided to create a set of updated forest cover maps.

Last updated: 22 September 2015

References

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