Multiple ecosystem services, possible trade-offs and synergies in a temperate forest ecosystem in Mexico: a review

摘要

Identification of the ecosystem services provided by Mexican temperate forests is a prerequisite in ensuring their conservation and sustainable management. This study aimed (1) to describe ecosystem services provided by Mexican temperate forests (provisioning, regulating and cultural services); and (2) to identify possible trade-offs and synergies based on the types of ecosystem services available in Mexican temperate forests. We synthesized relevant literature from scientific articles, government statistics and grey literature covering the years 1985-2012. Timber extraction is the main beneficial ecosystem service of temperate forests recognized by public policy as shown by the high income from this activity; but it has trade-offs of greater magnitude with other provisioning services (water, bioenergy and non-timber forest resources), and with other supporting, regulating and cultural ecosystem services. For example, it causes the loss of other forest resources, extinction of commercially important species and loss of the system's structural complexity. Water capture and extraction of non-timber forest resources have lesser effects on support and regulation services, and in the case of water capture, the magnitude of the effect depends on the type and reversibility of the modification of the ecosystem. The synergies between ecosystem services have mutual benefits; for example, a decision to enhance the scenic beauty in temperate forests potentially improves water cycling and provision of non-timber forest resources, and has a positive effect on cultural and regulation services. In Mexican temperate forests the recognition of ecosystem services is limited and is based largely on grey literature. More robust scientific information is needed on the role of these forests in maintaining biodiversity and provision of ecosystem services essential to the welfare of the population. Also, monitoring of ecosystem processes of highland temperate forests in tropical regions is very limited, so it is necessary to generate research to develop a paradigm shift from forest management based strictly on logging to one based on ecosystem management.