Table 6. Summary of each column included in the forest carbon cycling dataset, including column number, column name, data format, units, range of values, and a short description.

Col.	Col. name	Format	Units	Range	Description
1	PROJECT	categorical	—	—	Project name
2	YEAR	numerical	year	1999–2014	Sampling year
3	MONTH	numerical	month	5–10	Sampling month
4	DAY	numerical	day	1–31	Sampling day
5	ECOREGION	categorical	—	—	EPA Level III Ecoregion
6	CLUSTER	categorical	—	—	General sampling area
7	PLOT_ID	numerical	—	1–1,014	Plot identification number
8	PLOT_ID_ALT	numerical	—	—	Alternative PLOT_ID is previously sampled
9	PLOT_ID_AMERIFLUX	categorical	—	—	AmeriFlux identification
10	LATITUDE	numerical	decimal degree	37.7844–45.9477	Plot latitude (WGS84)
11	LONGITUDE	numerical	decimal degree	−123.9038–−117.1309	Plot longitude (WGS84)
12	ELEVATION	numerical	m	138–2,758	Elevation above sea level
13	MAT	numerical	°C	2.43–13.53	Mean annual temperature (1984–2013)
14	MAP	numerical	mm yr−1	248–2,839	Mean annual precipitation (1984–2013)
15	SITE_DESC	categorical	—	—	General site description
16	ASA	numerical	year	8–795	Average stand age
17	SPP_O1_ ABBREV	categorical	—	—	Primary overstory species abbreviation
18	SPP_O1_BASAL_AREA_FRACTION	numerical	%	33–100	Primary overstory species basal area fraction
19	SPP_O2_ ABBREV	categorical	—	—	Secondary overstory species abbreviation
20	SPP_O2_ BASAL_AREA_FRACTION	numerical	%	0–50	Secondary overstory species basal area fraction
21	SPP_O3_ ABBREV	categorical	—	—	Tertiary overstory species abbreviation
22	SPP_O3_ BASAL_AREA_FRACTION	numerical	%	0–30	Tertiary overstory species basal area fraction
23	SPP_O4_ ABBREV	categorical	—	—	Quaternary overstory species abbreviation
24	SPP_O4_ BASAL_AREA_FRACTION	numerical	%	0–17	Quaternary overstory species basal area fraction
25	LAI_O	numerical	m2 m−2	0–14.7	Stand overstory leaf area index
26	HEIGHTC	numerical	m	1–54	Average canopy height
27	AG_BIOMASS_TREE_WOOD_AS_CARBON	numerical	g C m−2	71–64,035	Tree wood aboveground biomass
28	AG_BIOMASS_TREE_FOLIAGE_AS_CARBON	numerical	g C m−2	0–1,738	Tree foliage aboveground biomass
29	AG_BIOMASS_TREE_TOTAL_AS_CARBON	numerical	g C m−2	53–65,151	Tree total aboveground biomass
30	AG_PROD_TREE_WOOD_AS_CARBON	numerical	g C m−2 yr−1	0–800	Tree wood aboveground productivity
31	AG_PROD_TREE_FOLIAGE_AS_CARBON	numerical	g C m−2 yr−1	0–388	Tree foliage aboveground productivity
32	AG_PROD_TREE_TOTAL_AS_CARBON	numerical	g C m−2 yr−1	0–958	Tree total aboveground productivity