Table 1 Description of selected component pools and total carbon forest stocks within timberlands of the US coastal southeast.

Carbon pools	Description	Mean (mg/ha)	SD
Live-tree carbon	Carbon in the above- and below-ground portions of the tree, excluding foliage, of live trees ≥ 2.54 cm DBH/DRC	66.816	48.504
Standing-dead tree carbon	Carbon in the above- and below-ground portions of the tree, excluding foliage, of standing-dead trees ≥ 12.7 cm DBH/DRC	1.319	3.368
Carbon in soil organic material	Carbon in fine organic material below the soil surface to a depth of 1 m estimated from a model using soil forming factors²⁰. Does not include roots. This attribute is a component of the US Environmental Protection Agency’s Greenhouse Gas Inventory and was obtained from a model developed directly from Phase 3 measurements of soil attributes in the US Department of Agriculture Forest Service’s Forest Inventory and Analysis NFI program	67.152	23.490
Total carbon	Carbon aggregated from forest plot measurements at tree-level (e.g. C in live and standing-dead trees) and at condition-level (C in down and dead trees, C in soil organic material, C in litter, and above- and below-ground carbon in the understory^‡)	159.148	77.526

DBH: diameter at 137 cm above ground. DRC: diameter at root collar.
Mean and standard deviations derived from 39,882 national forest inventory plots in the original sample. Estimates were compiled at the inventory plot-level based on tree, condition and plot information. Plot-level timberland estimates were obtained from conditions contained within a plot. Non-timberland conditions were excluded, and plot level estimates were expanded proportionally. Live-tree and standing-dead tree carbon estimates were derived entirely from tree-level measurements on timberland conditions and expanded proportionally to the timberland portion of a plot. Other NFI-derived estimates were aggregated from condition to plot level.
^‡Includes carbon in above- and below-ground portions of seedlings and woody shrubs as reported by NFI aggregated to carbon of organic material on the forest floor, including fine woody debris, humus, and fine roots in the organic forest floor layer above mineral soil.

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