Table 1 Pre-Euro-American settlement period fire interval estimates for Texas natural subregions (LBJ School of Public Affairs 1978) based on a map analysis of three modeling and mapping efforts. Different sources of information were used for developing each map. Historical mean fire interval maps and estimates are based on one or more of the following: fire history studies, climate parameters, human population estimates, topography, vegetation, and expert opinion. The number of quantitative fire history studies for each natural subregion is given in the right column. Numbering of natural subregions corresponds to Figure 1. NP = nonpyrophytic, Indet. = indeterminate, SV = sparsely vegetated.
Data source: | Frost (1988) | PC2FM | LANDFIRE | Â | ||||
|---|---|---|---|---|---|---|---|---|
Scale of estimates: | coarse (undefined) | coarse (1.2 km2) | fine (30 m2) | Â | ||||
| Â | Â | Historical Mean Fire Interval (yr) | Â | |||||
Texas natural region and subregion | Area (km2) | Range | Majority | Range | Majority | Range | Majority | Studies (n) |
1. Piney Woods | Â | Â | Â | Â | Â | Â | Â | Â |
a. Longleaf Pine Forest | 10762 | 1 to 6 | l to 3 | 3 to 5 | 4 | 1 to Barren | l to 5 | 0 |
b. Mixed Pine to Hardwood Forest | 49 397 | 1 to 6 | 4 to 6 | 3 to 5 | 4 | 1 to Barren | l to 5 | 0 |
2. Oak Woods and Prairies | Â | Â | Â | Â | Â | Â | Â | Â |
a. Oak Woodlands | 35 034 | 1 to 6 | 4 to 6 | 3 to 4 | 3 | 1 to Barren | l to 5 | 0 |
b. Eastern Cross Timbers | 4287 | 1 to 6 | l to3 | 3 to 4 | 3 | 1 to Barren | l to 5 | 0 |
c. Western Cross Timbers | 13 045 | 4 to 6 | 4 to 6 | 3 to 4 | 3 | 1 to Barren | l to 5 | 0 |
3. Blackland Prairies | Â | Â | Â | Â | Â | Â | Â | Â |
a. Blackland Prairie | 51227 | 1 to 6 | 4 to 6 | 2 to 4 | 3 | 1 to Indet. | l to 5 | 1 |
b. Grand Prairie | 12652 | 1 to 12 | 4 to 6 | 3 to 4 | 3 | 1 to Barren | l to 5 | 0 |
4. Gulf Coast Prairies and Marshes | Â | Â | Â | Â | Â | Â | Â | Â |
a. Dunes and Barrier | 1422 | 4 to 6 | 4 to 6 | 3 to 4 | 3 | 1 to Barren | l to 5 | 0 |
b. Estuarine Zone | 6 836 | 1 to 6 | l to 3 | 3 to 4 | 4 | 1 to Indet. | 11 to 15 | 0 |
c. Upland Prairies and Woods | 44156 | l to 3 | l to 3 | 2 to 5 | 3 | 1 to Indet. | l to 5 | 0 |
5. Coastal Sand Plains | 9660 | 1 to 6 | l to 3 | 3 to 5 | 4 | 1 to Indet. | l to 5 | 0 |
6. South Texas Brush Country | Â | Â | Â | Â | Â | Â | Â | Â |
a. Brush Country | 64121 | 1 to 12 | 4 to 6 | 2 to 6 | 5 | 1 to Indet. | 11 to 15 | 0 |
b. Bordas Escarpment | 1272 | 4 to 6 | 4 to 6 | 3 to 5 | 4 | 1 to Indet. | 6 to 10 | 0 |
c. Subtropical Zone | 2 843 | l to 3 | l to 3 | 3 to 5 | 4 | 1 to Indet. | 26 to 30 | 0 |
7. Edwards Plateau | Â | Â | Â | Â | Â | Â | Â | Â |
a. Live Oak to Mesquite Savanna | 56262 | 1 to 12 | 4 to 6 | 3 to 12 | 3 | 1 to Indet. | l to 5 | 0 |
b. Balcones Canyonlands | 13 335 | 4 to 12 | 7 to 12 | 3 to 4 | 3 | 1 to Indet. | l to 5 | 0 |
c. Lampasas Cut Plain | 8654 | 1 to 12 | 4 to 6 | 3 to 4 | 3 | 1 to Barren | l to 5 | 0 |
8. Llano Uplift | 10 823 | 4 to 12 | 7 to 12 | 3 to 4 | 3 | 1 to Indet. | l to 5 | 0 |
9. Rolling Plains | Â | Â | Â | Â | Â | Â | Â | Â |
a. Mesquite Plains | 93 854 | 1 to 6 | l to 3 | 3 to 7 | 4 | 1 to Indet. | 6 to 10 | 0 |
b. Escarpment Breaks | 11871 | 1 to 6 | 4 to 6 | 5 to 7 | 5 | 1 to Barren | 11 to 15 | 0 |
c. Canadian Breaks | 6248 | 1 to 6 | 4 to 6 | 5 to 8 | 7 | 1 to SV | 11 to 15 | 0 |
10. High Plains | 88311 | 1 to 6 | l to 3 | 5 to 14 | 7 | 1 to Indet. | 11 to 15 | 0 |
11. Trans Pecos | Â | Â | Â | Â | Â | Â | Â | Â |
a. Mountain Ranges | 6261 | 4 to NP | 7 to 12 | 6 to 27 | 8 | 1 to Indet. | 11 to 15 | 3 |
b. Desert Grassland | 23 071 | 1 to NP | 7 to 12 | 6 to 32 | 8 | 1 to Indet. | 11 to 15 | 0 |
c. Desert Scrub | 44704 | 1 to NP | 7 to 12 | 6 to 35 | 13 | 1 to Indet. | 11 to 15 | 0 |
d. Salt Basin | 824 | 7 to NP | NP | 12 to 30 | 26 | 1 to Indet. | Barren | 0 |
e. Sand Hills | 6 354 | 1 to 12 | l to 3 | 10 to 15 | 13 | 1 to Indet. | 11 to 15 | 0 |
f. Stockton Plateau | 14 886 | 4 to 12 | 7 to 12 | 6 to 15 | 10 | 1 to Indet. | Indet. | 0 |