Fire interval and post-fire climate effects on serotinous forest resilience

Fire Ecology

Table 2 Summary statistics of plot-level pre-fire and post-fire stand structure of knobcone pine forests in Oregon and California, USA, by fire interval (Fire int) in years. Values represent median (minimum–maximum) values for each variable at each fire interval

		Pre-fire					Post-fire
Fire int (years)	n	Basal area^a (m² ha⁻¹)	Stand density^a (trees ha⁻¹)	Canopy seed bank^b (cones ha⁻¹)	Avg cones tree⁻¹	Proportion knobcone pine (by density)	Seedling density¹ (trees ha⁻¹)	Proportion knobcone pine (by density)	Proportion second year seedlings
6	5	1.3	7261	348	0.1	1	249	1	1
6	5	(0.4–2.4)	(4576–24,918)	(149–846)	(0.03–0.2)	(1.00–1.00)	(149–1442)	(1.00–1.00)	(1.00–1.00)
10	8	4.9	2338	5391	1.7	1	1183	1	0.89
10	8	(1.1–8.8)	(162–7,894)	(1415–10,544)	(0.7–4.3)	(1.00–1.00)	(469–6875)	(1.00–1.00)	(0.71–1.00)
15	6	7.5	3366	3,222	1.3	1	1317	1	0.98
15	6	(3.8–25.3)	(1210–4426)	(668–6631)	(0.3–2.4)	(1.00–1.00)	(943–2734)	(1.00–1.00)	(0.92–1.00)
16	14	8.4	1840	10,494	6.0	0.99	12,644	1	0.96
16	14	(0.5–30.7)	(334–10,823)	(501–47,619)	(1.6–16.3)	(0.16–1.00)	(138–116,374)	(0.51–1.00)	(0.71–1.00)
17	7	7	2288	25,083	5.8	1	1890	1	0.97
17	7	(2.1–11.7)	(842–6543)	(4577–34,660)	(4.4–12.8)	(1.00–1.00)	(289−13,174)	(1.00–1.00)	(0.85–1.00)
22	6	20.2	2143	13,959	7.7	1	10,469	1	1.00
22	6	(6.2–21.3)	(305–4742)	(157–29,692)	(0.5–11.3)	(1.00–1.00)	(117−18,203)	(1.00–1.00)	(0.98–1.00)
31	6	26.7	3547	85,360	32.1	1	118,516	1	0.99
31	6	(11.6–38.1)	(522–6543)	(48,095–126,674)	(12.1–92.1)	(0.97–1.00)	(39,219–250,156)	(1.00–1.00)	(0.98–1.00)
Long	19	16.5	865	17,350	80.6	0.91	13,766	1	0.93
Long	19	(4.5–48.8)	(79–3531)	(6543–33,472)	(2.0–214.1)	(0.09–1.00)	(599–134,062)	(0.95–1.00)	(0.86–1.00)

^aValues represent total basal area, stand density, and post-fire seedling density for conifer tree species only
^bCanopy seed bank represents open cones on knobcone pine only