One of the central themes in the field of environmental economics has been the valuation of natural resources, usually within the framework of cost-benefit analysis or damage assessment. Natural resources such as forest ecosystems, are associated with a wide flow of non-productive services such as biodiversity, clean air and water. Such services have their value to the society but there is no relevant observed market where their total economic value is expressed. Within this context a qualifiedvaluation strategy must be formulated so that we can, not only, correctly assess the total value of such natural resource, but also understand its nature in terms of the identified forest functions.