Past diameters of each stumpsection were determined by measuring ring widths (to 

 the nearest 0.1 mm) along a radial that appeared to best represent diameter growth. 

 Stump diameters outside bark (D ) at any time (t) in the past was calculated by 



D = (d.o.b.) Zri/Zri 

 t t p 



in which d.o.b. is present diameter outside bark, tvi is the sum of ring widths from 



the pith to time t, and Ivi is the sum of all ring widths along the radial. If there 



P 



was more than one stem at stump height, ring widths were measured on the largest stem 

 and the calculated equivalent diameter was used for d.o.b. 



Basal area and total aboveground biomass of each tree were calculated by decades 

 from 1860 to 1970 and also for 1965 to 1975, using the calculated past diameters and 

 interpolated heights as inputs to regression models described in appendix B. 



Stand basal area and biomass per hectare from 1860 to 1978 were calculated by 

 summing the values of the individual trees and dividing by plot area (0.09 ha). 



RESULTS AND DISCUSSION 



Elevation, slope, and aspect of the plots are listed in table 1. All eight plots 

 are on skeletal soils derived from igneous parent material. Sweetwater 

 plots SI, S2 , and S3 were measured in 1977 and reported by Meeuwig and Budy (1979); 

 and Sweetwater plot S4 was measured in 1978. Plots PI, P2, and P3 are in the Paradise 

 Range near Gabbs, Nevada; and Ml is in House Canyon in the Monitor Range. 



Except for plot P3, the stands sampled in 1978 were considerably older than the 

 three sampled in 1977 (table 2) . They apparently escaped the extensive cutting that 

 took place in the Nevada woodlands during the latter half of the 19th century. Four 

 plots showed no evidence of tree harvesting, other than some juniper-post cutting, 

 even though they were surrounded by woodland that apparently had been cut over in the 

 19th century. 



Table 1 . --Elevation, slope and aspect of the eight plots 



Plot Elevation Slope Aspect 



SI 



m 



2 200 



Percent 

 5 



N 



80° 



E 



S2 



2 



100 



20 



N 



40° 



E 



S3 



2 



300 



15 



S 



60° 



E 



S4 



2 



030 



25 



N 



15° 



W 



PI 



2 



060 



5 



N 



6° 



W 



P2 



2 



040 



15 



N 



55° 



E 



P3 



2 



190 



5 



N 



85° 



E 



Ml 



2 



220 



20 



S 



60° 



E 



9 



