Answer here (but using a "model"):
"Using new observations and models, a team calculated that terrestrial plants took in an average of 123 billion tons of carbon per year from 1998-2005. Tropical forests were responsible for 34 percent of that figure, while savannahs came in second with 26 percent.
CO2 uptake was often linked to precipitation in grasslands, savannahs, shrublands, and croplands. These areas could be especially vulnerable to changes in water supply, the team says in Science. But the productivity of forests in boreal and tropical regions appears to be less affected by precipitation, so they may fare better under climate change."
"Using new observations and models, a team calculated that terrestrial plants took in an average of 123 billion tons of carbon per year from 1998-2005. Tropical forests were responsible for 34 percent of that figure, while savannahs came in second with 26 percent.
CO2 uptake was often linked to precipitation in grasslands, savannahs, shrublands, and croplands. These areas could be especially vulnerable to changes in water supply, the team says in Science. But the productivity of forests in boreal and tropical regions appears to be less affected by precipitation, so they may fare better under climate change."
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