Geographic Patterns and Stand Variables Influencing Growth and Vigor of Populus tremuloides in the Sierra Nevada (USA)

Table 1

Summary data for variable radius plots centered on sample aspen trees (𝑛=175) giving vicinity basal area (BA) including BA of sample aspen tree, and composition of neighbor trees (in terms of percent BA; excluding sample aspen tree) in 20 stands around Lake Tahoe Basin.

Variable	Mean	s.d.	Min.	Max.
Vicinity BA (m^2 ha^−1)	49.2	20.5	18.4	119.4
Aspen (%)	56.3	41.3	0.0	100.0
Conifer (%)	31.7	37.8	0.0	100.0
Pine spp. (%)	13.4	27.3	0.0	100.0
Fir spp. (%)	17.8	30.1	0.0	100.0
Hardwood (%)	1.1	8.5	0.0	100.0