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Fire Ecology
Fig. 6 | Fire Ecology

Fig. 6

From: Distant neighbors: recent wildfire patterns of the Madrean Sky Islands of southwestern United States and northwestern Mexico

Fig. 6

The smoothed density plots illustrate the distribution of area burned (orange) relative to unburned environments (gray) in the Madrean Ecoregion Sky Islands that experienced fire in the time period of the study (1985 to 2011). Variables considered were: a) Annual heat moisture index, b) Mean annual precipitation, c) Mean annual temperature, d) Beginning of frost-free period, e) Mean summer precipitation, f) Lightning flash rate, g) Population density, h) Road density, and i) Terrain ruggedness index. The top graph for each variable was constructed from random points in US burned−unburned locations; the bottom graph used a set of random points for Mexico. Test comparisons indicated rejection of the null hypothesis that burned−unburned samples came from a common distribution (AD.T P-value < 0.001)

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