60 Forestry Quarterly 



A Preliminary Report on the Progress in the Remeasurement 

 of Sample Plots on the Coconino and Tusayan National Forests, 

 Arizona. By G. A. Pearson, 



Mr. Pearson's manuscript progress report, dated December, 

 1914, brings first results of the permanent sample plots which 

 have been established by the Fort Valley Experiment Station. The 

 methods used in establishing these plots are set forth in Mr, 

 Woolsey's article, "Permanent Sample Plots," in Forestry 

 QUARTERI.Y, Vol. X., No. 1, pp. 38-44. The establishment of 

 plots was begun by the Fort Valley Experiment Station in 1909 

 and, in all subsequent ones till 1913, only one method of cutting 

 (the standard method employed on timber scale areas^) was used. 

 These early plots, therefore, do not give a comparison of the 

 results under different methods of cutting Western Yellow pine, 

 but they do furnish data on what may be expected in the way of 

 growth and reproduction following the standard method of cut- 

 ting pure stands of this species in Arizona and New Mexico. 



The plots on the Coconino and Tusayan National Forests, Ari- 

 zona, consist of large areas, usually from 160 to 480 acres, on 

 which only diameters are measured, and one or more small plots 

 of from four to twelve acres within the major plot, on which 

 more detailed work, such as height measurements, crown descrip- 

 tions, and reproduction studies are made. 



The four plots established on the Coconino and Tusayan in 

 1909 were remeasured and remapped in 1914. The aggregate 

 area of the major plots is approximately 1,180 acres, and of the 

 minor plots (within the major plots) approximately seventy-eight 

 acres. The field work occupied a crew averaging three men about 

 four months. The cost will total $2,500 or $2.12 per acre. This, 

 it would seem, is rather expensive. 



A large portion of the data remains to be compiled. Owing to 

 the fact that the computation of volumes requires the construc- 

 tion of special volume tables for different areas, this work will 

 require a considerable amount of time. The following partial 

 data for the plot S-3 on the Tusayan National Forest serves to 

 illustrate the character of the information which will be obtained. 



'See "Forest Service," U. S. Dept. of Agr, Bull. 101, pp. 49-51; also 

 "Cutting Western Yellow Pine in Arizona and New Mexico," T. S. 

 Woolsey, Jr., Proc. Soc. Am. Foresters, Vol. IX, No. 4, pp. 479-503. 



