Examining the Potential of Forest Residue-Based Amendments for Post-Wildfire Rehabilitation in Colorado, USA

Table 2

Soil properties after a six-month greenhouse trial with lodgepole pine-derived biochar and soil from areas affected by the Church’s Park fire, Colorado. Data are means and standard error in parentheses ( per treatment).

		Biochar	Watering regime		values
		t/ha	Dry	Wet	Biochar	Water	Char × water
Gravimetric water content	(%)	0	12.1 (0.7)	20.5 (0.6)	<0.001	<0.001	<0.001
		20	21.7 (1.0)	23.0 (0.9)
	—	0	5.6 (0.05)	5.6 (0.05)	<0.001	0.570	0.731
		20	5.9 (0.06)	6.0 (0.08)
	—	0	4.5 (0.07)	4.6 (0.03)	<0.001	0.128	0.401
		20	4.9 (0.04)	5.0 (0.06)
NO3-N	(mg/L)	0	1.8 (0.3)	0.8 (0.2)	<0.001	0.002	0.297
		20	7.9 (0.7)	5.8 (0.5)
NH4-N	(mg/L)	0	0.3 (0.1)	0.5 (0.1)	0.524	0.231	0.441
		20	0.3 (0.1)	0.3 (0.1)
P	(mg/L)	0	36.0 (1.3)	38.2 (1.0)	<0.001	0.520	0.026
		20	49.5 (0.6)	45.7 (1.9)
K	(mg/L)	0	23.6 (1.2)	22.5 (0.9)	<0.001	0.009	0.115
		20	30.5 (0.9)	26.2 (0.9)
Mg	(mg/L)	0	16.6 (1.6)	16.6 (1.7)	0.253	0.883	0.888
		20	18.7 (1.6)	18.2 (1.5)
Ca	(mg/L)	0	99.5 (4.0)	95.7 (3.7)	0.001	0.166	0.785
		20	112.2 (2.7)	106.6 (2.8)