Title: Climate change mitigation through afforestation/reforestation: A global analysis of hydrologic impacts with four case studies
Authors: Trabucco, Antonio ×
Zomer, RJ
Bossio, DA
van Straaten, O
Verchot, LV #
Issue Date: 2008
Publisher: Elsevier
Series Title: Agriculture, Ecosystems & Environment vol:126 issue:1-2 pages:81-97
Abstract: The implicit hydrologic dimensions of international efforts to mitigate climate change, specifically potential impacts of the Clean
Development Mechanism-Afforestation/Reforestation (CDM-AR) provisions of the Kyoto Protocol (KP) on global, regional and local water
cycles, are examined. The global impact of the redistribution of water use driven by agriculture and land use change, of which CDM-AR can
be a contributing factor, is a major component of ongoing global change and climate change processes. If converted to forest, large areas
deemed suitable for CDM-AR would exhibit increases in actual evapotranspiration (AET) and/or decreases in runoff. Almost 20% (144 Mha)
of all suitable land showed little or no impact on runoff and another 28% (210 Mha) showed only moderate impact. About 27% (200 Mha) was
in the highest impact class, exhibiting an 80–100% decrease in runoff, and prevalent in drier areas (based on Aridity Index (AI)), the semi-arid
tropics, and in conversion from grasslands and subsistence agriculture. Significant impacts on local hydrologic cycles were evident, however
large impacts were not predicted at regional or global scale due primarily to the current limit on carbon offset projects under the Kyoto
Protocol. Predicted decreases in runoff ranged from 54% in drier areas to less than 15% in more humid areas, based on four case studies
located across a range of biophysical conditions and project scenarios in Ecuador and Bolivia. Factors other than climate, e.g. upstream/
downstream position, were shown to be important in evaluating off-site impacts. This study demonstrates that it will become increasingly
important to consider implications on local to regional water resources, and how the hydrologic dimension of CDM-AR impacts on issues of
sustainability, local communities, and food security.
ISSN: 0167-8809
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division Forest, Nature and Landscape Research
× corresponding author
# (joint) last author

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