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Pine Forests
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Figure 3. Generalized climate-differentiated ponderosa
pine forests in Arizona and New Mexico. Diagram
a) depicts the open, grassy pine forests described
around the turn of the century (1890 to 1925).
The open forest has a grassy understory, sparse
ponderosa pine regeneration in the dry end, and,
as precipitation increases, poor regeneration
of ponderosa pine, Douglas-fir, blue spruce, or
white fir. Diagram b) illustrates the same forest
under average conditions in the 1990s (Johnson
1993, 1994). Diagram c) depicts the same forest
10 to 15 years after a fire holocaust. Natural
or managed reforestation is occuring, although
understory grasses may not be the same composition
or density as that in diagram a) (Foxx 1996).
Artwok by Joyce Patterson. |
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Pine Forests
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