Carbon Flux of Down Woody Materials in Forests of the North Central United States

Table 2

Average annual carbon flux by forest type for down woody material components where n > 3: live (standing live trees), Sdead (standing dead trees), FWD (fine woody debris), and CWD (coarse woody debris) where a negative estimate indicates a net sequestration north central across the United States, 2002 to 2007.

Forest type	𝑛	Live	Std. Err.	Sdead	Std. Err.	FWD	Std. Err.	CWD	Std. Err.
Red pine	4	−0.87	0.51	−0.03	0.06	−0.13	0.10	−0.14	0.13
Balsam fir	4	−0.17	0.71	−0.36	0.42	−0.18	0.11	−0.34	0.18
Black spruce	4	0.44	0.43	0.10	0.06	−0.09	0.05	−0.80	0.75
Northern white cedar	7	−0.30	0.23	−0.05	0.05	0.13	0.08	0.27	0.15
White/red oak and hickory	31	−0.03	0.32	0.05	0.13	−0.13	0.10	0.23	0.19
White oak	10	−0.91	0.09	0.00	0.02	0.19	0.08	0.17	0.24
Elm/Ash/Black Locust	12	−0.42	0.16	−0.46	0.16	−0.68	0.74	−0.75	0.43
Mixed upland hardwoods	10	0.46	0.76	−0.53	0.68	−0.12	0.19	−0.20	0.24
Black ash/American elm/red maple	8	−0.53	0.32	−0.08	0.21	0.03	0.25	0.30	0.22
Silver maple/American elm	4	−1.85	0.60	−0.12	0.08	−0.20	0.17	−0.28	0.98
Sugar maple/beech/yellow birch	12	0.07	0.40	−0.20	0.14	0.14	0.10	0.34	0.20
Hard maple/basswood	9	−0.31	0.38	−0.33	0.27	−.20	0.12	0.14	0.39
Aspen	14	−0.36	0.20	−0.02	0.08	0.04	0.13	0.11	0.28
Balsam poplar	4	−0.47	0.20	−0.23	0.20	0.08	0.28	0.04	0.09