Classification and nomenclature of temperate forest types in Mexico

Aims: To analyze and synthesize the principal contributions to the creation of a classification of established forests in sub-humid, temperate climatic regions in Mexico. Methods: Documentary analysis and review of works on the classification of the vegetation of Mexico, with emphasis from 1950 to the present. To identify and analyze the terms frequently used to refer to these plant communities, the following was done: literature search, analysis of frequencies and co-occurrences of these terms that appeared in the titles of the documents. A list of associations of these communities was compiled through a documentary review. Results: Vegetation classification proposals, both nationally and internationally, tend towards the standardization of criteria and nested hierarchical integration at various levels based on physiognomic, climatic, phenological and floristic attributes. The two highest levels of organization in these proposals are based on major vegetation, defined by vegetation forms and climatic criteria as "temperate forests". Meanwhile lower levels, including the level of associations, are based on their floristic composition. The most frequently used term to refer to these plant communities, according to the documents used in the search, is "temperate forest", although other terms frequently used are "coniferous forest", "pine forest", and "oak forest". Conclusions: Knowledge about the classification of vegetation in Mexico dates back to pre-Hispanic times. However, it was not until the second half of the 20th century that solid proposals that are influential today were put forward. Given the high biological diversity of the country, it is still a pending task to characterize and make an inventory of the diversity at the level of associations that form this type of temperate forests.

Taxonomic reference: Villaseñor (2016).

Abbreviations: FVT = Trans-Mexican Volcanic Belt; SECLAVEMEX = Mexican Vegetation Classification System; SMO = Sierra Madre Oriental; SMOc = Sierra Madre Occidental; SMS = Sierra Madre del Sur (SMS).