Bark Thickness Equations for Mixed-Conifer Forest Type in Klamath and Sierra Nevada Mountains of California

Table 1

Description of study sites at Klamath National Forest (KNF), Tahoe National Forest (TNF), Stanislaus-Tuolumne Experimental Forest (STEF), and Sequoia National Forest (SNF). Average temperature is reported as the mean temperature during winter and summer months, respectively. Soil types include parent material (PM). Species sampled: Douglas-fir (PSME), red fir (ABMA), white fir (ABCO), incense-cedar (CADE), sugar pine (PILA), western white pine (PIMO), Jeffrey pine (PIJE), and lodgepole pine (PICO).

Site	Location	Average; temp.; (°C)	Annual; precip.; (mm)	Soil type and; parent materials	Species sampled and sample size (number of trees)	Elevation; range of; sampling; (m)
KNF	41.5003°N 123.3333°W	24–41	559	Gravely clay loam; PM: basic igneous, metamorphic, and altered sedimentary rocks	ABCO (53), ABMA (48), CADE (29), PILA (17), PIMO (6), PSME (30)	1508–1868
TNF	39.5625°N 120.5625°W	6–23	1,397	Gravely loam; PM: andesite and volcanic rock	ABCO (39), ABMA (53), PICO (29), PIJE (20), PIMO (23)	2013–2369
STEF	38.1677°N; 120.0°W	0–17	940	Sandy to fine sandy loam; PM: granite and diorite	ABCO (365), CADE (221), PIJE (51), PILA (189)	1820–1948
SNF	37.4167°N 119.1667°W	7–26	660	Sandy clay loam; PM: sedimentary, granite, and granodiorite	ABCO (40), ABMA (37), CADE (16), PIJE (10), PILA (6)	2066–2499