The vegetation of a desert mountain range as conditioned by climatic factors . rest stand apart in three loosely definedgroups in close parallelism to the zonation of the vegetation itself. During the arid fore-summer the evaporation at 5,000 feet is similarto that at 4,000 feet, while during the humid mid-summer it is morenearly like that of the 6,000-foot station. In other words, the adventof the rains causes the evaporation conditions of the Upper Encinaland lower Forest region to extend downward into the Lower Encinal. The significance of slope exposure in determining evaporation rateis in
The vegetation of a desert mountain range as conditioned by climatic factors . rest stand apart in three loosely definedgroups in close parallelism to the zonation of the vegetation itself. During the arid fore-summer the evaporation at 5,000 feet is similarto that at 4,000 feet, while during the humid mid-summer it is morenearly like that of the 6,000-foot station. In other words, the adventof the rains causes the evaporation conditions of the Upper Encinaland lower Forest region to extend downward into the Lower Encinal. The significance of slope exposure in determining evaporation rateis indicated in figures 13 and 14. In these graphs the vertical gradientsof evaporation at the six elevations are shown separately for the instru-ments on the south slopes and the north slopes at each station. Thegradients for the arid fore-summer and for the humid mid-summerare shown, as well as the curves for the entire summer. In the aridseason there is even a slightly greater evaporation on north slopes at4,000 and 5,000 feet than there is on south slopes, but this condition.
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