| 词条 | Trans-Mexican Volcanic Belt pine-oak forests |
| 释义 |
| name = Trans-Mexican Volcanic Belt pine-oak forests | image = Pinus hartwegii forest.jpg | image_size = | image_alt = | image_caption = Popocatépetl, Puebla state | country = Mexico (Central) | border = Jalisco dry forests | border1 = Balsas dry forests | border2 = Bajío dry forests | border3 = Central Mexican matorral | border4 = Veracruz montane forests | border5 = Tehuacan valley matorral | border6 = Central Mexican matorral | border7 = Veracruz montane forests | border8 = Oaxacan montane forests | border9 = Zacatonal | bird_species = | mammal_species = | plant_species = | habitat_loss = | habitat_loss_ref = | protected = | protected_ref = | area = 91800 | conservation = Critical/endangered[1] | biome = Tropical and subtropical coniferous forests | map = Trans-Mexican Vocanic Belt Pine-Oak Forests map.svg | map_size = | map_alt = | map_caption = | global200 = }} The Trans-Mexican Volcanic Belt pine-oak forests is a subtropical coniferous forest ecoregion of the Trans-Mexican Volcanic Belt of central Mexico. SettingThe Trans-Mexican Volcanic Belt pine-oak forests occupy an area of {{convert|91,800|km2|sqmi|sp=us}}, extending from Jalisco state in the west to Veracruz in the east. The pine-oak forests are surrounded by tropical dry forests at lower elevations to the west, northwest, and south; the Jalisco dry forests to the west and southwest; the Balsas dry forests to the south, in the basin of the Balsas River, and the Bajío dry forests to the northwest, in the basin of the Rio Grande de Santiago and the lower Rio Lerma. The Central Mexican matorral lies to the north of the range in the high basins of the Plateau, including the Valley of Mexico and the upper reaches of the Lerma around Toluca. The Tehuacan valley matorral lies in the rain shadow valley to the southeast in Puebla and Tlaxcala states. To the east, the moist Veracruz montane forests and Oaxacan montane forests are the transition between the pine-oak forests and the lowland tropical forests along the Gulf of Mexico. Pockets of montane grassland and shrubland can be found among the pine-oak forests, and constitute a separate ecoregion, the Zacatonal. FloraThe chief plant communities are pine forests, pine-oak forests, oak forests, pine-cedar forests, and pine-fir forests. The plant communities vary with elevation and rainfall. Pine forests are generally found between 2,275 and 2,600 m. Pine-oak forests occur between 2,470 and 2,600 m. Pine-cedar forests can be found above 2,700 m. Pine-fir forests occur above 3000 m. In the pine forests, Montezuma pine (Pinus montezumae) is generally predominant, with smooth-bark Mexican pine (P. pseudostrobus) predominant in more humid areas, and Hartweg's pine (P. hartwegii) and P. tecote in dry areas with shallow soils. Pine-fir forests are composed almost entirely of Hartweg's pine (Pinus hartwegii) and sacred fir (Abies religiosa). FaunaThe volcano rabbit (Romerolagus diazi) and the Mexican volcano mouse (Neotomodon alstoni) are endemic to the ecoregion. Monarch butterfliesThe Volcanic Belt pine-oak forests of eastern Michoacán and western México states is the winter habitat of monarch butterflies (Danaus plexippus), which migrate from temperate regions of North America east of the Rocky Mountains. The Mariposa Monarca Biosphere Reserve is within this habitat. See also
References1. ^{{WWF ecoregion|name=Trans-Mexican Volcanic Belt pine-oak forests|id=nt0310 |accessdate=2012-11-04}} 11 : Trans-Mexican Volcanic Belt|Tropical and subtropical coniferous forests|Ecoregions of Mexico|Forests of Mexico|Natural history of Jalisco|Natural history of Michoacán|Natural history of the State of Mexico|Natural history of Tlaxcala|Natural history of Veracruz|Flora of Central Mexico|Neotropic ecoregions |
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