Table 4.
Average annual net C change (Tg C year−1) across US forests between 2006 and 2010, disaggregated into categories of non-forest land to forest land, forest land to non-forest land, and forest land remaining forest land
| Category | Area (Mha year−1) | Net C gain (Tg C year−1) | Net C loss (Tg C year−1) |
|---|---|---|---|
| Non-forest land to forest land | 0.4 | −8 ± 1 | |
| Forest land to non-forest land | 0.1 | 6 ± 1 | |
| Forest land remaining forest land | 221.1 | −452 ± 47 | 185 ± 10 |
| Insect damage | 0.9 | 9 ± 1 | |
| Forest fire | 0.6 | 7 ± 1 | |
| Wind damage | 0.6 | 5 ± 1 | |
| Drought | 0.8 | 1 ± 0 | |
| Timberlands | 152.0 | −342 ± 42 | 162 ± 10 |
| Undisturbed forest | 54.9 | −109 ± 19 | |
| Total | 221.6 | −460 ± 48 | 191 ± 10 |
| Net C change | −269 ± 49 |
Results are further disaggregated by disturbance type within the forest land remaining forest land category