Table 2.
Net primary productivity (NPP) and its components, carbon residence time (CRT) in different biomass components, and nitrogen (N) use efficiency of productivity in the four forest types
| Lower montane forest | Ocotea forest | Podocarpus forest | Erica forest | |
|---|---|---|---|---|
| Production (Mg ha−1 year−1) | ||||
| NPP total | 17.79 ± 1.41 (8.47) | 13.24 ± 2.31 (6.43) | 12.65 ± 0.87 (6.16) | 5.75 ± 0.40 (2.78) |
| Aboveground production | 12.06 ± 1.19 (5.83) | 8.42 ± 1.89 (4.14) | 8.23 ± 0.83 (4.04) | 1.40 ± 0.47 (0.69) |
| Canopy litterfall | 8.07 ± 0.42 (3.91) | 4.60 ± 0.37 (2.30) | 5.21 ± 0.64 (2.58) | 0.54 ± 0.05 (0.28) |
| Leaves | 6.14 ± 0.39 (2.98) | 3.24 ± 0.34 (1.64) | 3.18 ± 0.36 (1.61) | 0.009 ± 0.003 (0.005) |
| Branches | 0.95 ± 0.19 (0.45) | 0.45 ± 0.09 (0.22) | 0.59 ± 0.12 (0.29) | 0.32 ± 0.05 (0.16) |
| Rest | 0.99 ± 0.04 (0.48) | 0.91 ± 0.18 (0.44) | 1.44 ± 0.17 (0.69) | 0.22 ± 0.01 (0.11) |
| Wood | 3.99 ± 0.82 (1.92) | 3.82 ± 1.63 (1.84) | 3.02 ± 0.29 (1.45) | 0.86 ± 0.42 (0.42) |
| Belowground production | 5.73 ± 0.22 (2.64) | 4.83 ± 0.49 (2.29) | 4.42 ± 0.48 (2.12) | 4.35 ± 0.08 (2.08) |
| Fine roots Sequential coring | 4.65 ± 0.02 (2.12) | 3.80 ± 0.34 (1.79) | 3.57 ± 0.54 (1.71) | 4.07 ± 0.20 (1.95) |
| Fine roots Ingrowth core | 1.14 ± 0.14 (0.51) | 1.12 ± 0.31 (0.54) | 1.42 ± 0.11 (0.66) | 0.47 ± 0.06 (0.22) |
| Coarse roots | 1.08 ± 0.20 (0.52) | 1.03 ± 0.39 (0.50) | 0.85 ± 0.07 (0.41) | 0.27 ± 0.12 (0.13) |
| % NPP Aboveground litterfall | 46 ± 2 | 36 ± 4 | 41 ± 2 | 9 ± 1 |
| % NPP Aboveground wood | 22 ± 3 | 27 ± 7 | 24 ± 2 | 14 ± 6 |
| % NPP Fine roots | 26 ± 2 | 30 ± 5 | 28 ± 4 | 72 ± 8 |
| % NPP Coarse roots | 6 ± 1 | 7 ± 2 | 7 ± 1 | 5 ± 2 |
| CRT Aboveground wood (year) | 68.8 ± 5.1 | 98.9 ± 15.6 | 133.8 ± 9.4 | 48.2 ± 10.8 |
| CRT Coarse roots (year) | 45.5 ± 2.9 | 62.4 ± 8.8 | 81.6 ± 4.9 | 33.0 ± 6.7 |
| CRT Fine roots (year) | 0.52 ± 0.01 | 0.36 ± 0.04 | 1.19 ± 0.28 | 0.64 ± 0.23 |
| NUE (N) Canopy (g g−1) | 70.2 ± 4.8 | 72.1 ± 1.7 | 74.4 ± 7.1 | 111.9 ± 9.7 |
| NUE (N) Fine roots (g g−1) | 65.0 ± 12.7 | 58.9 ± 2.2 | 65.2 ± 1.2 | 145.1 ± 6.6 |
| Fine root: leaf litter ratio (g g−1) | 0.76 ± 0.04 | 1.19 ± 0.14 | 1.15 ± 0.19 | 535.60 ± 124.48 |
Given are means ± SE (n = 3). Values in parentheses give carbon fluxes (in Mg C ha−1 year−1)
NPP-belowground NPP-fine roots (Sequential coring) plus NPP-coarse roots