Reforestation of rainforests sequesters more carbon than plantations
09 August 2010
A new
study in Ecological Management & Restoration has found that
reforesting rainforest captures more carbon than monoculture plantation
and even mixed species plantations. The research tested three projects
in north-eastern Australia: a rainforest reforesting project using a
variety of native trees, a mixed species plantation, and a monoculture
plantation of conifers.
"Compared to the monoculture plantations reforestation projects were
more densely stocked, there were more large trees and the trees which
were used had a higher wood density then the conifers at the plantation,
explained co-author Dr John Kanowski an ecologist with the Australian
Wildlife Conservancy in a press release.
Environmentalists have long argued against turning to vast monoculture
plantations as a way to mitigate climate change, since such plantations
erode biodiversity, putting many species in danger. In addition,
plantations have sparked conflict with indigenous tribes and polluted
water supplies.
According to Kanowski this new study puts to rest the idea that
monoculture plantations store more carbon than rainforest projects.
"Carbon markets have become a potential source of funding for
restoration projects as countries and corporations seek the cheapest way
to reduce carbon emission. However, there is a concern that this
funding will encourage single species monoculture plantations instead of
diverse reforestation projects, due to the widely held belief that
monocultures capture more carbon."
Still Kanowski admits that there are economic difficulties in choosing
forest restoration over plantations, since restoration projects cost
more than implementing a plantation.
 Oil palm trees cut in order to establish a new plantation for palm oil production on the Indonesian island of Sumatra. Photo by: Rhett A. Butler. |
The study found that on average a hectare of restored rainforest stored 106 tons of carbon: over 40 tons of carbon more than a hectare of monoculture conifer plantation and 20 tons more than a hectare of mixed species plantation.
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