Carrying capacity of grazing ranges in southern Arizona . inches. Besides these general differences in precipita-tion, we have an increasing degree of annual fluctuation in amountof precipitation; a greater amount of evaporation, due to increasedtemperature; poorer^soil protection by vegetation; and longer peri-ods of desiccation as we go from the mountains toward the middleof the basin. All these factors are registered in the vegetation, bothin its character and its quantity, and the summation of these dif-feiences affects most profoundly the carrying capacity of this regionfor stock. Snow in
Carrying capacity of grazing ranges in southern Arizona . inches. Besides these general differences in precipita-tion, we have an increasing degree of annual fluctuation in amountof precipitation; a greater amount of evaporation, due to increasedtemperature; poorer^soil protection by vegetation; and longer peri-ods of desiccation as we go from the mountains toward the middleof the basin. All these factors are registered in the vegetation, bothin its character and its quantity, and the summation of these dif-feiences affects most profoundly the carrying capacity of this regionfor stock. Snow in quantity, depending largely upon the elevation,occurs at rather rare intervals in the winter, but lies on the ground foronly a short time. One of the heaviest snows for a number of years isshown in Plate I, fio^ure 1. Bui. 367, U. S. Dept. of Agriculture, Plate I. ^?^% J^^^ ^ :?,. ..4: Fig. in the Oak Belt on the Santa Rita Range Reserve, Showing anOccasional Winter Condition. Such snows are quite infrequent and last but a few days at Fig. 2.—a Dense Stand of Chollas (Opuntia fulqida) in the NortheasternPart of the Reserve Bui. 367, U. S. Dept. of Agriculture. Plate II.
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Keywords: ., bookcentury1900, bookdecade1910, bookidcar, booksubjectrangelands
