The Collaborative International Dictionary of English v.0.48:

Reafforestation \Re`af*for`es*ta"tion\ (-[e^]s*t[=a]"sh[u^]n),
   n.
   The act or process of converting again into a forest.
   [1913 Webster]

WordNet (r) 3.0 (2006):

re-afforestation
    n 1: the restoration (replanting) of a forest that had been
         reduced by fire or cutting [syn: reforestation, re-
         afforestation]