Table 1.
Catchment characteristics for the randomly selected streams in the southwestern and central regions of Sweden
| Southwest | Central | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | Min | 25 % | Median | 75 % | Max | Mean | Min | 25 % | Median | 75 % | Max | |
| Catchment area (ha) | 116 | 24 | 78 | 102 | 149 | 279 | 223 | 106 | 164 | 209 | 252 | 620 |
| Forest (%) | 91 | 37 | 89 | 96 | 99 | 100 | 86 | 54 | 77 | 88 | 96 | 100 |
| Wetland (%) | 7 | 0 | 0 | 2 | 9 | 59 | 13 | 0 | 3 | 11 | 18 | 46 |
| Till (%) | 57 | 0 | 42 | 63 | 76 | 99 | 70 | 26 | 59 | 72 | 82 | 99 |
| Peat (%) | 26 | 0 | 14 | 21 | 35 | 87 | 16 | 0 | 7 | 14 | 23 | 48 |
| Rock outcrops (%) | 14 | 0 | 0 | 2 | 18 | 83 | 12 | 0 | 1 | 6 | 16 | 66 |
| Final felled area (%) | 13.2 | 0.0 | 6.7 | 11.1 | 18.1 | 55.8 | 9.9 | 0.0 | 2.5 | 8.3 | 13.8 | 45.7 |
| Elevation (m a.s.l.) | 178 | 54 | 134 | 166 | 214 | 326 | 359 | 74 | 248 | 357 | 472 | 667 |
| Precipitation (mm year−1) | 995 | 750 | 950 | 950 | 1050 | 1250 | 782 | 650 | 750 | 750 | 850 | 950 |
| Runoff (mm year−1) | 501 | 350 | 450 | 450 | 550 | 650 | 424 | 250 | 350 | 450 | 450 | 550 |
| Vegetation period (days) | 196 | 190 | 190 | 200 | 200 | 210 | 164 | 140 | 160 | 160 | 170 | 180 |
| Mean Annual Temp. (°C) | 5.9 | 4.5 | 5.5 | 5.5 | 6.5 | 6.5 | 2.6 | 1.5 | 1.5 | 2.5 | 3.5 | 4.5 |
| Forest biomass (kton ha−1) | 96 | 22 | 84 | 97 | 109 | 146 | 68 | 30 | 52 | 65 | 83 | 110 |
| Forest growth (m3 ha−1 year−1) | 4.2 | 0.8 | 3.6 | 4.3 | 5.0 | 7.0 | 2.3 | 0.8 | 1.8 | 2.3 | 2.8 | 4.1 |
| ≥70 % Spruce (%) | 23 | 1 | 16 | 23 | 29 | 63 | 11 | 1 | 6 | 10 | 15 | 30 |
| ≥70 % Pine (%) | 11 | 2 | 7 | 11 | 15 | 27 | 25 | 6 | 17 | 23 | 34 | 66 |
| NHx deposition (kg ha−1 year−1) | 5.4 | 3.5 | 4.5 | 5.4 | 6.2 | 8.0 | 1.5 | 1.1 | 1.3 | 1.5 | 1.6 | 2.1 |
| NOx deposition (kg ha−1 year−1) | 5.3 | 4.3 | 5.1 | 5.4 | 5.5 | 5.8 | 2.4 | 1.8 | 2.3 | 2.4 | 2.5 | 3.0 |
| SOx deposition (kg ha−1 year−1) | 4.8 | 3.8 | 4.6 | 4.9 | 5.1 | 5.7 | 2.0 | 1.3 | 1.8 | 1.9 | 2.0 | 2.8 |
| Turbidity (FNU) | 2.4 | 0.4 | 1.0 | 1.5 | 2.5 | 33.0 | 1.0 | 0.0 | 0.4 | 0.7 | 1.2 | 9.4 |
| SPM (mg L−1) | 3.4 | 0.0 | 1.0 | 2.0 | 4.2 | 27.4 | 2.2 | 0.0 | 0.6 | 1.3 | 2.5 | 30.7 |
| TOC (mg L−1) | 29.9 | 6.3 | 19.9 | 27.7 | 38.0 | 77.0 | 18.0 | 1.8 | 9.9 | 16.7 | 24.0 | 58.3 |
| pH | 5.0 | 4.0 | 4.5 | 4.8 | 5.3 | 7.5 | 5.9 | 4.2 | 5.4 | 6.0 | 6.5 | 7.2 |
| N-tot (μg L−1) | 845 | 166 | 585 | 785 | 1014 | 2833 | 397 | 62 | 238 | 353 | 499 | 2050 |
| P-tot (μg L−1) | 19 | 5 | 12 | 16 | 23 | 73 | 11 | 1 | 5 | 9 | 14 | 82 |