Estimates of live-tree carbon stores in the Pacific Northwest are sensitive to model selection

Table 1 Live-tree carbon (C) ranges and uncertainty for northwest Oregon (NWOR)

Positive correlation	Trees 3 to 66 cm diameter at breast height (DBH)
	Approach 1: No corrections			Approach 2: Developmental DBH range			Approach 3: With corrections
Species	Minimum	Maximum	Uncertainty	Minimum	Maximum	Uncertainty	Minimum	Maximum	Uncertainty
	Tg C	Tg C	% of midpoint	Tg C	Tg C	% of midpoint	Tg C	Tg C	% of midpoint
Picea sitchensis	1.54	4.75	51	1.53	4.13	46	1.55	4.39	50
Pseudotsuga menziesii	9.56	455.32	96	31.26	70.40	38	18.57	135.57	76
Tsuga heterophylla	10.54	32.11	51	11.40	26.33	40	10.99	30.57	47
Acer macrophyllum	1.48	3.12	36	1.92	2.76	18	1.83	3.13	26
Alnus rubra	2.40	16.19	75	10.13	15.59	20	2.98	19.40	73
NWOR total	25.53	512.21	91	56.43	119.19	36	35.92	193.26	68
Negative correlation	Trees 3 to 66 cm diameter at breast height (DBH)
	Approach 1: No corrections			Approach 2: Developmental DBH range			Approach 3: With corrections
Species	Minimum	Maximum	Uncertainty	Minimum	Maximum	Uncertainty	Minimum	Maximum	Uncertainty
	Tg C	Tg C	% of midpoint	Tg C	Tg C	% of midpoint	Tg C	Tg C	% of midpoint
Picea sitchensis	2.26	3.61	23	1.93	3.37	27	2.13	3.57	25
Pseudotsuga menziesii	28.30	215.23	77	38.18	60.68	23	38.47	98.05	44
Tsuga heterophylla	15.58	23.97	21	14.07	21.08	20	14.93	23.92	23
Acer macrophyllum	1.90	2.70	17	2.08	2.63	11	2.16	2.78	13
Alnus rubra	5.10	14.40	48	11.85	14.08	9	7.78	14.40	30
NWOR total	53.05	259.91	66	68.11	101.83	20	65.48	142.73	37

Note: Results of applying species tree total prediction envelopes to the Forest Inventory and Analysis database for NWOR. Uncertainty is half of the carbon range, expressed as a percentage of the range midpoint.