Rate of absorption in new growth tropical rain forest = 2-3 times that of a boreal forest. However, we lose about 1 hectare of forest per second globally, much of it from the tropics.
Please note also that the figures I have quoted are on the very optimistic end of the scale - many scientists believe absorption rates are MUCH lower than this.
Finally, also consider that aviation only represents 3% of global emissions, so you need a huge increase in forest to cover even cover the current output, let alone the predicted increases.
Dr D.