Deforestation is being driven by global demand for
food and biofuels. Oil palm is an edible vegetable oil from the oil palm tree
that is primarily produced in Indonesia and Malaysia, accounting for 87% of
global production. Although it has been proposed that the cultivation of oil
palm has led to a decline in biodiversity, few studies have attempted to
quantify the environmental impact. Koh et al. use GIS to analyze land use in
Southeast Asia, quantify the amount of peatland transformed by oil palm production
and quantify the effect of cultivation on biodiversity.
A land cover map (250-m spacial resolution) and
digital elevation data was used to map the oil palm cultivation in Southeast
Asia. Land cover was classified into clusters using an algorithm which were
then assigned to one of five types of land cover (water, forest, plantation/
regrowth, mosaic or open) and 12 land cover classes. Accuracy of identification
was assessed using satellite images at 1-m resolution. According to Koh et al.,
98% of the area analyzed was correctly categorized to be oil palm and 85% of
closed canopy oil palm could be identified. A majority of the land that was
used for oil palm production was not peatland (90%) and only “6% of total
peatlands within our study region had been planted with oil palm” (5129). Sub-regions
had the highest percentages of peat-swamp loss to oil palm with the most
affected regions being North Sumatra, Bengkulu and Peninsular Malaysia. These
data show that the analysis used was able to correctly identify large (>200
ha) oil palm plantations and that plantations have had a larger impact on the
sub-region level than on the regional level.
Koh,
L. P., Miettinen, J., Liew, S. C., & Ghazoul, J. (2011). Remotely sensed
evidence of tropical peatland conversion to oil palm. Proceedings of
the National Academy of Sciences, 108(12), 5127-5132.
I
have acted with honesty and integrity in producing this work and am unaware of
anyone who has not. BP
No comments:
Post a Comment