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Oil palm plantations threaten water quality, Stanford scientists say
Date:6/30/2014

If you've gone grocery shopping lately, you've probably bought palm oil.

Found in thousands of products, from peanut butter and packaged bread to shampoo and shaving cream, palm oil is a booming multibillion-dollar industry. While it isn't always clearly labeled in supermarket staples, the unintended consequences of producing this ubiquitous ingredient have been widely publicized.

The clearing of tropical forests to plant oil palm trees releases massive amounts of carbon dioxide, a greenhouse gas fueling climate change. Converting diverse forest ecosystems to these single-crop "monocultures" degrades or destroys wildlife habitat. Oil palm plantations also have been associated with dangerous and abusive conditions for laborers.

Significantly eroded water quality now joins the list of risks associated with oil palm cultivation, according to new research co-authored by researchers from Stanford University and the University of Minnesota, who warn of threats to freshwater streams that millions of people depend on for drinking water, food and livelihoods. The new study in the Journal of Geophysical Research: Biogeosciences contains surprising findings about the intensity and persistence of these impacts, even in areas fully forested with mature oil palm trees.

Land clearing, plantation management (including fertilizer and pesticide application) and processing of oil palm fruits to make crude palm oil can all send sediment, nutrients and other harmful substances into streams that run through plantations. Vegetation removal along stream banks destroys plant life that stream organisms depend on for sustenance and shade.

"Although we previously documented carbon emissions from land use conversion to oil palm, we were stunned by how these oil palm plantations profoundly alter freshwater ecosystems for decades," said study co-author and team leader Lisa M. Curran, a professor of ecological anthropology at Stanford and
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Contact: Dan Stober
dstober@stanford.edu
650-721-6965
Stanford University
Source:Eurekalert

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