This research work is to determine the titration of forest timber species and its contribution to the environment in 02 hectares of Pabloyacusecondary forest production and research, using the Index of ecological value (IVI) and will serve as biometric have knowledge of the species found, the field evaluations were conducted during the months of October 2012 to March 2013, where it began with the cleanliness and the delimitation of the blocks. Taking as objectives: general biometric assess the volume of timber species and its contribution to the environment in 02 hectares of secondary forest and specific: To characterize the species forest timber in 02 hectares of area. It has dasometric inventory to determine the volume. Detennine the volume of each species per hectare and by radial class. The results obtained according to the raised aims were: One found 582 individuals and 37 forest sp...