Human Impacts...

Like any other ecosystem or ecoregion there are some human impacts that are just inevitable, for example:

1. Logging
2. Use of land for trafficing and immigration
3. Exploitation of Endemic Tree species.
4. Burning down the lower parts of pine-oak forests
5. Removal of plant coverage that leads to erosion
6. Human Settlements
7. Argiculture Purposes
8. Roads and Highways
9. Population Density Increase

But of course some of these impacts are benefits to humans and are some time hard to stop from happening. But there are ways that people can help, so that the areas don't disappear and species won't become extinct.

In the Pins-Oak Forest Roads are built for access to logging.

Reference Links:
http://www.eoearth.org/article/Biological_diversity_in_the_Madrean_pine-oak_woodlands?topic=49597
 http://www.eoearth.org/article/Trans-Mexican_Volcanic_Belt_pine-oak_forests
http://en.wikipedia.org/wiki/Trans-Mexican_Volcanic_Belt_pine-oak_forests