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Plantations can provide the same ecosystem services as natural forests

01.02.2010
Well-designed plantations can mitigate social, economic and environmental pressures

Not all plantations need to be the biological deserts that have come to characterize large-scale, industrial plantations. According to scientists in a paper out in February's issue of the journal Frontiers in Ecology and the Environment, well-planned plantations can actually alleviate some of the social, economic and ecological burden currently being placed on natural forests.

In addition, these biologically diverse, multi-purposed plantations can mitigate climate change by sequestering carbon, off-setting deforestation and reducing ecological strain on natural forests.

"Forest plantations have acquired a bad reputation," says Alain Paquette from the Université du Québec à Montréal, who co-authored the study with colleague Christian Messier. "But not all plantations are so-called 'biological desserts.' We believe that plantations have a legitimate place in the sound management of forests, and our aim is to provide some basis for an open discussion and to promote the use of well-conceived plantations."

The researchers looked at the types of plantations currently in use, the benefits and challenges associated with each and the best methods for creating the greatest social, economic and environmental return. For example, the authors examined the constraints plantations place on protecting natural forests, mitigating the effects of climate change and restoring ecological services.

In terms of the protection of natural forests, the researchers found that plantations were capable of alleviating the ecological stressors placed on natural forests when used within an integrated forest zoning approach—that is, when rules are enforced to ensure any increase in plantations is matched by protected areas within the same landscape.

"We have to look beyond the rows of uniform trees and evaluate plantations over larger temporal and spatial scales," says Paquette. "Well-planned, multi-purposed plantations can help preserve high diversity, old-growth forests that would be cut otherwise."

As for climate change, the authors reference a direct link between climate change and deforestation: land-use change accounts for roughly 25 percent of global greenhouse-gas emissions. In order for plantations to help limit the effects of climate change, the researchers contend, nations need to address the current economic demand for dead trees over live ones.

The researchers argue that, although even industrial monocultures can produce meaningful ecological services when managed correctly, "we can do better locally by using biologically diverse, multi-purposed plantations," says Paquette. "Theory and experimental works suggest that even more services could be produced with carefully chosen mixtures of species to promote the optimal use of resources."

In contrast to the common perception of plantations as biological deserts, the researchers describe the necessary elements for a well-planned, biologically-diverse plantation system. By improving plantation design through, among other methods, less intensive soil preparation, mixed-species vegetation and greater tolerance of other species in long-term maintenance, the authors believe that such plantations can deliver social, economic and environmental services similar to that of natural forests.

As a follow-up to their research, Paquette and colleagues are testing the potential benefits of allocating a small proportion of land over a one million hectare territory in eastern Canada to well-planned, multi-purposed plantations.

"Our goal is to use low intensity forestry practices and increase the proportion of protected land in the area," Paquette says. "We hope our model will support the practical applications of well-planned, biologically-diverse plantations worldwide."

The Ecological Society of America is the world's largest professional organization of ecologists, representing 10,000 scientists in the United States and around the globe. Since its founding in 1915, ESA has promoted the responsible application of ecological principles to the solution of environmental problems through ESA reports, journals, research, and expert testimony to Congress. ESA publishes four journals and convenes an annual scientific conference. Visit the ESA website at http://www.esa.org

Katie Kline | EurekAlert!
Further information:
http://www.esa.org

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