Study: Tree Planting Could Have Long-Term Benefits

Although planting trees alone is unlikely to solve climate problems, large-scale plantations could have a significant effect in the longer term, according to research published online in Carbon Balance and Management.

Rik Leemans and colleagues from Wageningen University, the Netherlands and the Netherlands Environmental Assessment Agency modeled the future effects of carbon plantations. They estimated plantations' long-term physical and social sequestration potential up to the end of the 21st century and their effectiveness in slowing down the increase in atmospheric carbon dioxide.

The projected outcomes differ widely: the authors found a difference of nearly 100 percent in the sequestration potential up to 2100 between two baseline scenarios. This highlights the effect of future land use uncertainties. Social, economic, and institutional barriers preventing carbon plantations in natural vegetation areas decrease the plantation's sink potential by 75 percent or more. Nevertheless, the forest's potential should not to be underestimated: Even the most conservative assumptions suggest that the cumulative sequestration potential up to 2100 can compensate for 5 percent to 7 percent of energy and industry-related carbon dioxide emissions.

However, trees aren't a quick fix, Leemans cautions. "The potential for the coming decades is limited due to the limited amount of available land and the long period needed to compensate for emissions related to the establishment of the plantations. The net sequestration up to 2020 is limited, given the short-term increased need for agricultural land and the long period needed to compensate for emissions through plantation establishment."

The most effective plantations occur in tropical regions, whereas the effectiveness of high latitude plantations is more questionable. Although plantations have a considerable carbon sink potential, the authors say that these should form part of a broader package of options, including reducing energy carbon dioxide emissions.

The article is available at www.cbmjournal.com.

Carbon Balance and Management is an open access, peer-reviewed online journal that encompasses all aspects of research aimed developing a comprehensive, policy relevant understanding of the global carbon cycle.

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