I think you're talking about "trees" not "wood" in the rainforest. Mr. Bing Search gave me the following answer:
A staggering 400 billion trees belonging to 16,000 different species make up the expansive Amazon rainforest, according to a recent study. The study also revealed that a mere 227 species make up half of the total trees across the whole basin. These 'hyperdominant' species include the rubber tree, the walking palm and the ungurahui tree – whose oil can be extracted to make juices and ice cream.