Table 1 Contribution of atmospheric N deposition to global forest soil respiration
From: A general framework for nitrogen deposition effects on soil respiration in global forests
Biome | N status | Area (108ha) | Ndep (kgN ha–1 yr–1) | SR (kgCO2 ha–1 yr–1) | ∆SRN-inc (PgC yr–1) | ∆SRN-dec (PgC yr–1) | ∆SRN (PgC yr–1) | Annual SR budget (PgC yr–1) | Contribution rate (%) |
|---|---|---|---|---|---|---|---|---|---|
Tropical | N-limited | 8.4 | 3.9 | 42420.1 | 0.2 (0.05) | −0.01 (0.004) | 0.2 (0.05) | 10.1 | 2.1 |
N-saturated | 9.6 | 7.2 | 39781.6 | 0.8 (0.1) | −0.05 (0.01) | 0.7 (0.1) | 10.4 | 6.8 | |
Subtotal | 18.0 | 5.7 | 40907.4 | 1.0 (0.1) | −0.06 (0.01) | 0.9 (0.1) | 20.5 | 4.5 | |
Temperate | N-limited | 3.6 | 5.4 | 28360.2 | 0.1 (0.03) | −0.01 (0.002) | 0.1 (0.03) | 2.8 | 4.5 |
N-saturated | 3.8 | 10.5 | 29488.1 | 0.4 (0.06) | −0.03 (0.005) | 0.4 (0.06) | 3.1 | 12.3 | |
Subtotal | 7.4 | 7.5 | 28842.4 | 0.5 (0.07) | −0.04 (0.005) | 0.5 (0.07) | 5.9 | 8.6 | |
Boreal | N-limited | 10.0 | 2.1 | 21896.6 | 0.2 (0.04) | −0.001 (5e-4) | 0.2 (0.04) | 6.1 | 2.8 |
N-saturated | 3.0 | 2.5 | 22820.4 | 0.1 (0.01) | −0.001 (5e-4) | 0.1 (0.01) | 1.9 | 4.6 | |
Subtotal | 13.0 | 2.2 | 22084.5 | 0.3 (0.04) | −0.002 (7e-4) | 0.3 (0.04) | 8.0 | 3.2 | |
Total | 38.4 | 4.6 | 29924.9 | 1.8 (0.1) | −0.1 (0.01) | 1.7 (0.1) | 34.4 | 4.9 | |
