Table 1.
Total deposition of NHx-N, NOy-N and total N on global forests using different criteria in assessing the area of forests (different cut-off points of forest coverage within an 18.5 × 18.5 km2 grid). All data are based on an overlay of the Global Forest Monitoring Project data and the deposition at 1° × 1° in 2010, as calculated with HTAP multi-model mean results.
| Forest cover | Area (Million km2) | NHx-N dep (Tg N yr−1) | NOy-N dep (Tg N yr−1) | Total N dep (Tg N yr−1) | Average N dep2 (kg N ha−1 yr−1) |
|---|---|---|---|---|---|
| >1% | 32.3 | 9.3 | 10.2 | 19.5 | 6.0 |
| >5% | 32.2 | 9.2 | 10.1 | 19.3 | 6.0 |
| >10% | 31.5 | 8.9 | 9.8 | 18.7 | 5.9 |
1
The HTAP emissions inventory was provided at a resolution of 0.1° x 0.1° but the spatial resolutions of the underlying HTAP global models were coarser, being mostly in the order of 1° x 1°
2
Average N deposition was derived by dividing the total N deposition by the area.