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Larger swaths of tropical forest being lost to commercial agriculture

Satellite images show half of all forest loss from 2000-12 was industrial expansion

Date:
May 9, 2017
Source:
Duke University
Summary:
Larger patches of tropical forest are being cleared in recent years to make way for industrial-scale agriculture, a new study shows. Analysis of deforestation maps shows that roughly half of the increase in tropical forest loss from 2000 to 2012 was linked to the expansion of these large-scale activities. The trend is most pronounced in Southeast Asia and South America.
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Larger patches of tropical forest are being lost worldwide as governments and corporations clear more land to make way for industrial-scale agriculture, a Duke University study shows.

The newly published analysis reveals that clearings for large-scale agricultural expansion were responsible for an increasing proportion -- in some places, more than half -- of all observed forest loss across the tropics between 2000 and 2012.

The trend was most pronounced in Southeast Asia and South America.

"In South America, more than 60 percent of the increase in deforestation was due to a growing number of medium- and large-sized forest clearings typical of what you see with industrial-scale commercial agricultural activities," said Jennifer J. Swenson, associate professor of the practice of geospatial analysis at Duke's Nicholas School of the Environment.

"Brazil, which had stricter policies limiting agricultural expansion until 2012, was the only country showing a reverse trend -- its average forest clearing size actually got smaller," she said. "This unique trend may be short-lived, however, given Brazil's relaxed forest policies of the last few years."

The new findings underscore the growing need for policy interventions that target industrial-scale agricultural commodity producers in the tropics, the researchers say.

A small family farm that produces sustenance crops or food for local consumption typically causes less than 10 hectares -- or just under 25 acres -- of land to be cleared per year, said Ph.D. student Kemen G. Austin, who co-authored the report. These small clearings can have relatively modest impacts on biodiversity, habitat connectivity, carbon storage, water quality, erosion control and other vital ecosystem services the forest provides.

By comparison, an industrial-scale plantation -- such as one that grows and processes palm oil or soybeans for the global market -- can cause nearly 2,500 acres of land to be cleared annually.

"As the size of the cleared land increases, so do the scale and scope of the potential ecological impacts," explained Ph.D. student Danica Schaffer-Smith.

The Duke team conducted their analysis using high-resolution, satellite-derived maps of forest cover produced by researchers at the University of Maryland.

"Using these invaluable maps, we were able to design a new computational approach that allowed us to analyze trends in clearing sizes across the globe," said Schwantes, who programmed the computational analysis with González-Roglich.


Story Source:

Materials provided by Duke University. Note: Content may be edited for style and length.


Journal Reference:

  1. Kemen G Austin, Mariano González-Roglich, Danica Schaffer-Smith, Amanda M Schwantes, Jennifer J Swenson. Trends in size of tropical deforestation events signal increasing dominance of industrial-scale drivers. Environmental Research Letters, 2017; 12 (5): 054009 DOI: 10.1088/1748-9326/aa6a88

Cite This Page:

Duke University. "Larger swaths of tropical forest being lost to commercial agriculture." ScienceDaily. ScienceDaily, 9 May 2017. <www.sciencedaily.com/releases/2017/05/170509121940.htm>.
Duke University. (2017, May 9). Larger swaths of tropical forest being lost to commercial agriculture. ScienceDaily. Retrieved March 29, 2024 from www.sciencedaily.com/releases/2017/05/170509121940.htm
Duke University. "Larger swaths of tropical forest being lost to commercial agriculture." ScienceDaily. www.sciencedaily.com/releases/2017/05/170509121940.htm (accessed March 29, 2024).

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