Soils Data for the Chronic Nitrogen Addition Plots, Prospect Hill Tract,					
Harvard Forest, Petersham MA.					
					
			year	plot	mean		
Forest Floor pH	
			88	PINE	3.2		
			88	HARD	3.3		
Forest Floor Depth (cm)	
			88	PINE	4.6		
			88	HARD	6.5
		
Forest Floor C:N	
			
		year	plot	mean	s.e.	n
		88	PC	22.17	1.19	6
		88	PL	25.75	1.94	6
		88	PNS	nd	nd	0
		88	PH	23.68	1.69	7
		88	HC	25.86	0.87	6
		88	HL	22.86	1.03	5
		88	HNS	nd	nd	0
		88	HH	23.65	0.98	6

Mineral Soil C:N	
		88	PC	20.47	0.59	9
		88	PL	25.08	1.17	9
		88	PNS	nd	nd	0
		88	PH	21.51	0.98	9
		88	HC	23.45	0.99	9
		88	HL	18.86	1.27	9
		88	HNS	nd	nd	0
		88	HH	21.17	0.85	9
					
					
	
Net Mineralization			
NO3-N+NH4-N, kg ha-1yr-1	
	year	plot	organic	mineral	org + min
			horizon	horizon	
	88	PC	45.57	39.85	85.42
	90	PC	41.96	33.05	75.01
	91	PC	38.24	36.16	74.40
	93	PC	48.05	33.35	81.40
	96	PC	71.81	53.80	125.61

	88	PL	63.34	44.31	107.65
	90	PL	48.15	35.77	83.92
	91	PL	48.76	59.27	108.03
	93	PL	55.64	55.18	110.82
	96	PL	62.53	57.90	120.43

	88	PNS	15.49	28.52	44.01
	90	PNS	32.79	20.94	53.73
	91	PNS	36.04	59.17	95.21
	93	PNS	60.03	59.62	119.65
	96	PNS	81.69	63.01	144.69

	88	PH	80.78	69.69	150.47
	90	PH	50.26	57.52	107.78
	91	PH	39.43	63.51	102.94
	93	PH	43.27	52.37	95.64
	96	PH	72.08	80.88	152.96

	88	HC	45.46	25.39	70.85
	90	HC	44.92	25.11	70.03
	91	HC	40.70	31.75	72.44
	93	HC	56.79	24.17	80.96
	96	HC	73.82	26.47	100.29

	88	HL	53.20	30.16	83.36
	90	HL	45.42	20.17	65.59
	91	HL	35.57	18.84	54.40
	93	HL	74.57	28.94	103.51
	96	HL	119.05	50.77	169.83

	88	HNS	14.18	16.28	30.46
	90	HNS	39.21	16.24	55.45
	91	HNS	42.04	34.06	76.10
	93	HNS	71.83	31.68	103.51
	96	HNS	70.53	33.79	104.32

	88	HH	68.89	31.04	99.93
	90	HH	63.95	28.16	92.11
	91	HH	86.95	56.88	143.83
	93	HH	116.03	80.72	196.76
	96	HH	125.01	90.88	215.89
					
	
Net Nitrification	
NO3-N, kg ha-1yr-1
	year	plot	organic	mineral	org + min
			horizon	horizon	
	88	PC	1.68	9.40	11.08	
	90	PC	5.02	20.42	25.44
	91	PC	1.35	20.97	22.32
	93	PC	1.41	15.34	16.75
	96	PC	2.62	22.25	24.88

	88	PL	5.12	16.91	22.03
	90	PL	7.16	23.22	30.38
	91	PL	7.34	33.88	41.21
	93	PL	8.45	30.52	38.97
	96	PL	23.20	47.68	70.88

	88	PNS	2.13	10.27	12.39
	90	PNS	5.78	19.56	25.35
	91	PNS	6.21	35.44	41.65
	93	PNS	6.54	34.41	40.95
	96	PNS	19.17	51.97	71.14

	88	PH	9.35	15.72	25.07
	90	PH	7.88	33.04	40.92
	91	PH	8.05	45.97	54.03
	93	PH	10.11	38.65	48.77
	96	PH	25.86	63.60	89.46

	88	HC	0.07	-0.24	-0.17
	90	HC	-0.08	0.11	0.03
	91	HC	0.03	1.85	1.88
	93	HC	0.00	0.18	0.18
	96	HC	0.00	0.00	0.00

	88	HL	0.70	0.55	1.25
	90	HL	0.09	2.06	2.15
	91	HL	0.15	1.23	1.38
	93	HL	0.15	0.43	0.58
	96	HL	0.12	1.28	1.40

	88	HNS	0.04	0.46	0.50
	90	HNS	0.00	1.95	1.95
	91	HNS	0.42	1.96	2.38
	93	HNS	1.75	0.71	2.45
	96	HNS	0.00	0.97	0.97

	88	HH	5.05	-0.72	4.33
	90	HH	0.08	2.34	2.42
	91	HH	-0.72	0.60	-0.12
	93	HH	1.19	6.61	7.80
	96	HH	10.75	39.24	50.00