agriculture

On tropical farms, bigger is not better

mexican_farm

Small, family-owned farms that use agroecological techniques come closest to mimicking natural forest habitat by creating corridors that allow plants and animals to migrate between forest fragments. Agroecological techniques can include the use of biological controls instead of pesticides and the use of compost or other organic matter instead of chemical fertilizers. (Courtesy: iStockphoto)

U. MICHIGAN (US)—Small family-owned farms—not industrial-scale agriculture—offer the best way to produce large amounts of food and still preserve biodiversity in tropical regions undergoing massive deforestation.

“Most of the tropical forest that’s left is fragmented, and what you have are patches of forest surrounded by agriculture,” says Ivette Perfecto, professor at the University of Michigan’s School of Natural Resources and Environment. “If you want to maintain biodiversity in those patches of forest, then the key is to allow organisms to migrate between the patches.

“And small-scale family farms that adopt sustainable agricultural technologies are more likely to favor migration of species than a huge, monocultural plantation of soybeans or sugar cane or some other crop.”

Some ecologists have suggested that the forest transition model of eastern North America provides a preview of what’s likely to happen in the tropics.

European colonization of eastern North America led to massive deforestation that accompanied the expansion of agriculture. Later, industrialization drew people to cities from the rural areas, and the forests recovered.

It has been argued that if a similar progression occurs in the tropics, then the decline in rural populations would make more land potentially available for conservation. A corollary of the forest transition model states that if you consolidate agriculture into large, high-tech farms, productivity increases and more land is freed up for conservation.

But after reviewing case studies from Costa Rica, El Salvador, Panama, Argentina, Brazil, and Mexico, Perfecto and her colleague John Vandermeer conclude “there is little to suggest that the forest transition model is useful for the tropics” and that it “projects an overly optimistic vision.”

Their findings were published in the Proceedings of the National Academy of Sciences.

Instead, they say an alternative, which they call the matrix quality model, provides a solid foundation for conservation planning in tropical regions.

If you think of the fragments of remaining tropical forest as islands in an ocean of agriculture, the ocean is what Perfecto and Vandermeer call the matrix—it’s the area between the patches of undisturbed natural habitat.

A high-quality matrix is one that enables plants and animals to migrate between the remaining patches of forest, increasing the likelihood that a given species will be able to survive, helping to preserve biodiversity.

Small, family-owned farms that use agroecological techniques come closest to mimicking natural forest habitat by creating corridors that allow plants and animals to migrate between forest fragments.

Agroecological techniques can include the use of biological controls instead of pesticides, the use of compost or other organic matter instead of chemical fertilizers, and the use of agroforestry methods, which involve growing crops beneath a canopy of trees or growing crops mixed with fruit trees such as mangoes or avocados.

“If you’re really interested in conserving species, you should not just concentrate on preserving the fragments of natural habitat that remain, even though that’s where many species are,” explains Vandermeer, professor of ecology and evolutionary biology and a professor at the School of Natural Resources and Environment.

“You also need to concentrate on the areas between the fragments, because those are the places that species have to migrate through.”

Vandermeer advocates the break-up of large-scale farms in the tropics, as well as incentives to encourage “a large number of small-scale farmers, each managing the land to the best of his or her ability, using agroecological techniques.”

Perfecto says these goals are in line with the findings of the 2009 International Assessment of Agricultural Knowledge, Science and Technology for Development synthesis report.

The report concluded that small-scale, sustainable farms are the best way to alleviate world hunger while promoting sustainable development. Perfecto was one of the report’s authors.

The PNAS article by Perfecto and Vandermeer is part of a special report in the journal about solutions to the world food crisis.

University of Michigan news: www.ns.umich.edu/

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