Tree species	Red maple
Soil amendment	CON		PM		BBC		LBC
Soil MBC (mg kg−1)	344.2	13.1	250.88	37.15	382.08	35.74	389.46	17.98
Root dry mass (g)
Dec. 2005	0.84	0.25	0.55	0.17	0.29	0.11	0.70	0.14
Feb. 2006	0.70	0.27	0.43	0.14	1.22	0.25	1.50	0.52
May 2006	0.39	0.16	0.43	0.31	1.17	0.81	1.29	0.96
July 2006	0.95	0.55	1.03	0.30	0.49	0.27	0.74	0.35
Sept. 2006	0.48	0.09	0.78	0.33	4.07	2.13	1.21	0.71
Nov. 2006	0.35	0.13	0.69	0.29	0.80	0.12	0.90	0.17
Fine root length (cm)
Dec. 2005	314.18	133.42	276.72	55.61	385.63	142.69	461.30	75.82
Feb. 2006	391.39	163.29	217.49	71.38	514.96	109.29	458.01	28.74
May 2006	341.52	163.69	165.33	11.79	398.27	108.74	481.69	106.95
July 2006	372.88	177.48	253.88	51.45	567.27	54.05	624.93	105.50
Sept. 2006	463.34	84.03	315.41	97.55	444.97	63.45	688.07	60.84
Nov. 2006	372.71	142.52	565.52	160.53	467.72	132.41	767.93	84.87
Soil C Content (%)
Dec. 2005	1.79	0.33	1.94	0.39	3.36	0.85	2.72	0.26
Feb. 2006	2.05	0.64	2.36	0.37	2.10	0.35	2.85	0.37
May 2006	1.81	0.39	2.29	0.31	2.09	0.37	2.35	0.22
July 2006	1.73	0.30	3.20	0.80	2.43	0.19	2.30	0.44
Sept. 2006	2.35	0.38	2.63	0.43	2.98	0.52	3.00	0.22
Nov. 2006	1.99	0.40	3.32	0.99	3.27	0.57	3.77	0.26
Soil N Content (%)
Dec. 2005	0.12	0.01	0.10	0.02	0.22	0.04	0.19	0.02
Feb. 2006	0.16	0.03	0.14	0.01	0.17	0.02	0.22	0.02
May 2006	0.15	0.02	0.13	0.01	0.18	0.02	0.19	0.01
July 2006	0.15	0.02	0.16	0.02	0.21	0.02	0.19	0.02
Sept. 2006	0.18	0.02	0.16	0.02	0.24	0.03	0.24	0.01
Nov. 2006	0.17	0.02	0.18	0.03	0.25	0.03	0.28	0.01
Soil C/N Ratio
Dec. 2005	14.2	0.9	20.0	1.3	14.6	0.9	14.5	0.3
Feb. 2006	12.1	1.0	16.6	1.8	11.7	0.7	12.7	0.7
May 2006	11.8	0.8	17.3	1.8	11.4	0.5	12.3	0.3
July 2006	11.6	0.6	19.4	2.6	11.9	0.1	12.0	0.7
Sept. 2006	12.7	0.8	15.9	2.3	12.1	0.6	12.7	0.5
Nov. 2006	11.6	0.6	17.4	3.3	12.7	0.7	13.6	0.6
Soil Respiration (μmol m−2 s−1)
Nov. 2005	1.36	0.15	1.28	0.29	1.70	0.48	1.44	0.23
Dec. 2005	0.28	0.04	0.48	0.31	0.19	0.12	0.59	0.18
Jan. 2006	0.71	0.16	0.70	0.13	1.38	0.36	1.86	0.24
Feb. 2006	0.34	0.12	0.22	0.03	1.01	0.75	0.34	0.08
Mar. 2006	0.95	0.24	1.78	0.82	1.78	0.68	1.93	0.96
May 2006	5.31	0.74	3.53	0.26	7.80	2.15	5.98	1.18
June 2006	5.29	0.80	9.46	1.31	8.56	2.08	11.00	1.73
July 2006	12.48	2.26	11.91	3.52	24.90	1.83	26.05	4.04
Aug. 2006	12.09	0.60	9.64	2.76	11.01	1.90	13.23	1.52
Sept. 2006	11.94	2.34	9.25	1.78	12.56	2.49	13.65	1.62
Oct. 2006	7.13	1.07	7.47	1.19	7.50	1.68	15.41	1.72
Nov. 2006	2.68	0.69	2.17	0.47	3.30	0.36	5.16	1.06
Soil MB C (mg kg−1)	489.56	23.42	269.41	21.25	463.27	68.48	501.26	47.87
Root dry mass (g)
Dec. 2005	0.71	0.40	0.34	0.11	0.42	0.26	0.69	0.39
Feb. 2006	0.26	0.04	1.52	1.17	0.16	0.02	0.42	0.07
May 2006	0.17	0.05	0.16	0.08	0.11	0.02	0.86	0.70
July 2006	0.45	0.26	0.11	0.03	0.13	0.02	2.46	2.18
Sept. 2006	0.55	0.22	0.16	0.05	0.11	0.05	0.85	0.64
Nov. 2006	0.22	0.10	0.26	0.08	1.51	1.15	2.10	1.89
Fine root length (cm)
Dec. 2005	366.32	160.99	537.42	131.63	387.95	51.02	443.52	42.36
Feb. 2006	345.96	38.97	413.12	169.87	381.59	61.88	359.60	40.30
May 2006	382.57	114.27	315.56	111.13	363.87	22.23	449.32	35.58
July 2006	330.06	25.28	309.85	132.37	360.04	35.37	373.53	83.30
Sept. 2006	409.19	135.25	518.68	124.21	297.63	80.90	400.04	122.58
Nov. 2006	378.07	79.35	563.39	39.93	598.84	119.99	350.40	37.81
Soil C Content (%)
Dec. 2005	1.44	0.18	3.23	0.55	2.35	0.28	2.99	0.52
Feb. 2006	1.72	0.27	2.43	0.41	2.51	0.16	3.55	0.35
May 2006	1.59	0.15	4.18	0.41	2.66	0.26	2.88	0.24
July 2006	1.79	0.24	3.45	1.12	2.75	0.22	2.70	0.33
Sept. 2006	1.74	0.05	2.85	0.17	1.98	0.46	3.15	0.41
Nov. 2006	1.90	0.23	2.06	0.38	2.67	0.13	2.26	0.34
Soil N Content (%)
Dec. 2005	0.10	0.01	0.12	0.01	0.18	0.02	0.21	0.04
Feb. 2006	0.14	0.01	0.15	0.01	0.21	0.01	0.27	0.02
May 2006	0.14	0.01	0.17	0.01	0.21	0.02	0.22	0.02
July 2006	0.15	0.01	0.17	0.03	0.22	0.02	0.21	0.02
Sept. 2006	0.15	0.01	0.17	0.01	0.17	0.02	0.24	0.03
Nov. 2006	0.16	0.01	0.14	0.01	0.22	0.01	0.19	0.02
Soil C/N Ratio
Dec. 2005	14.0	0.7	25.8	3.6	13.4	0.3	14.1	0.1
Feb. 2006	12.2	1.0	16.2	2.6	12.2	0.2	13.2	0.3
May 2006	11.3	0.6	25.3	2.3	12.5	0.3	13.1	0.2
July 2006	11.9	0.8	18.8	2.6	12.3	0.1	12.5	0.3
Sept. 2006	11.3	0.4	16.9	0.6	11.5	1.3	12.9	0.2
Nov. 2006	11.7	0.8	14.0	1.6	11.9	0.2	11.7	0.8
Soil Respiration (μmol m−2 s−1)
Nov. 2005	2.18	0.44	1.72	0.18	2.72	0.30	2.95	0.51
Dec. 2005	0.54	0.06	2.03	1.12	0.42	0.18	1.31	0.53
Jan. 2006	0.93	0.24	1.72	0.56	1.24	0.28	1.21	0.27
Feb. 2006	0.84	0.10	1.35	0.42	1.03	0.22	1.08	0.12
Mar. 2006	2.36	0.71	0.45	0.18	1.59	0.63	3.16	1.59
May 2006	7.04	1.18	3.62	0.35	6.00	0.84	5.69	1.23
June 2006	7.86	1.34	7.63	0.94	10.18	2.11	9.01	2.10
July 2006	13.03	2.49	7.29	1.82	11.08	3.18	8.31	1.66
Aug. 2006	8.00	1.12	8.02	0.52	7.24	0.54	10.58	1.62
Sept. 2006	8.95	0.52	9.75	0.93	8.91	0.29	12.89	1.27
Oct. 2006	9.09	1.17	6.23	1.13	8.98	1.31	9.69	2.03
Nov. 2006	3.02	0.54	3.32	0.80	5.50	1.58	3.75	0.16
Soil MBC (mg kg−1)	289.79	23.83	252.49	19.89	369.97	30.78	371.92	38.66
Root dry mass (g)
Dec. 2005	0.17	0.06	0.23	0.13	0.34	0.19	0.21	0.16
Feb. 2006	0.19	0.06	0.10	0.02	0.49	0.28	0.31	0.21
May 2006	0.15	0.04	0.74	0.39	0.63	0.59	0.19	0.07
July 2006	0.47	0.23	0.20	0.07	0.22	0.11	2.10	1.39
Sept. 2006	0.31	0.06	0.69	0.61	0.06	0.03	0.10	0.01
Nov. 2006	0.47	0.14	0.13	0.06	0.31	0.23	0.12	0.03
Fine root length (cm)
Dec. 2005	129.43	28.87	103.92	16.08	83.92	32.89	69.24	32.82
Feb. 2006	140.55	69.22	99.78	25.96	181.27	34.54	97.90	19.22
May 2006	213.54	93.99	122.59	26.92	124.22	38.14	97.08	36.01
July 2006	218.52	67.95	165.86	24.87	147.18	69.15	97.89	24.18
Sept. 2006	238.07	48.63	150.04	50.78	110.57	43.64	172.66	43.73
Nov. 2006	201.87	35.39	118.75	19.05	123.33	35.56	93.11	26.82
Soil C Content (%)
Dec. 2005	1.18	0.05	3.88	1.40	2.67	0.32	2.69	0.46
Feb. 2006	1.72	0.40	4.02	0.28	2.82	0.33	3.04	0.30
May 2006	1.66	0.12	3.94	1.05	3.09	0.57	2.80	0.14
July 2006	1.54	0.11	2.45	0.39	3.10	0.40	2.52	0.49
Sept. 2006	2.31	0.40	2.57	0.72	3.93	0.54	3.07	0.28
Nov. 2006	1.81	0.22	3.19	0.41	3.46	0.27	3.04	0.28
Soil N Content (%)
Dec. 2005	0.09	0.01	0.14	0.02	0.19	0.02	0.18	0.03
Feb. 2006	0.14	0.02	0.18	0.01	0.23	0.02	0.23	0.02
May 2006	0.14	0.01	0.18	0.02	0.25	0.03	0.21	0.01
July 2006	0.13	0.01	0.15	0.01	0.25	0.03	0.20	0.03
Sept. 2006	0.18	0.02	0.14	0.02	0.29	0.03	0.24	0.02
Nov. 2006	0.16	0.01	0.17	0.02	0.30	0.02	0.23	0.02
Soil C/N Ratio
Dec. 2005	13.5	0.3	25.8	4.2	13.9	0.3	14.9	0.2
Feb. 2006	12.0	0.9	22.2	1.5	12.3	0.4	13.0	0.1
May 2006	11.8	0.5	20.9	3.0	12.3	0.6	13.5	0.4
July 2006	11.4	0.3	16.2	1.7	12.5	0.3	12.6	0.5
Sept. 2006	12.9	0.8	16.9	3.0	13.3	0.6	12.9	0.2
Nov. 2006	11.3	0.6	18.1	0.9	11.8	1.1	12.9	0.4
Soil Respiration (μmol m-2 s−1)
Nov. 2005	1.03	0.14	1.61	0.43	2.18	0.75	1.03	0.26
Dec. 2005	0.78	0.15	0.90	0.32	0.96	0.59	0.58	0.14
Jan. 2006	0.92	0.12	1.31	0.53	1.18	0.40	1.05	0.27
Feb. 2006	0.44	0.15	0.89	0.19	0.64	0.20	0.42	0.17
Mar. 2006	1.71	0.44	1.87	0.21	1.60	0.20	1.69	0.58
May 2006	5.47	0.96	5.45	1.04	7.03	1.39	5.30	0.97
June 2006	7.31	2.80	10.26	1.87	10.71	3.02	9.15	2.23
July 2006	16.48	6.11	14.29	3.21	24.18	5.14	20.19	3.45
Aug. 2006	14.20	5.79	8.73	1.40	15.60	3.70	12.09	2.70
Sept. 2006	6.92	2.03	5.51	0.78	8.40	1.09	6.42	1.26
Oct. 2006	7.33	1.72	8.99	1.61	7.82	0.50	6.55	1.25
Nov. 2006	1.88	0.67	1.15	0.24	2.40	0.71	1.83	0.24