Table 1
Description of the hybrid aspen field trials over Sweden (Swe), Finland (Fi) and north-west Russia (Ru) included in the study
| Trial | Name | Type of land | Planted year | Lat [Nº] | Long [Eº] | Alt [m] | Temp. [sum, d.d] |
|---|---|---|---|---|---|---|---|
| Swe 1 | Sturup | agricultural | 2010 | 56º34’ | 13º23’ | 120 | 1527 |
| Swe 2 | Malteröd | forest | 2010 | 56º07’ | 13º37’ | 114 | 1501 |
| Swe 3 | Toftaholm | forest | 2010 | 56º59’ | 14º03’ | 162 | 1405 |
| Swe 4 | Remningstorp | agricultural | 2010 | 58º16’ | 13º22’ | 133 | 1359 |
| Swe 5 | Harg | agricultural | 2010 | 60º05’ | 18º15’ | 29 | 1356 |
| Swe 6 | Karön | forest | 2010 | 60º10’ | 18º13’ | 25 | 1347 |
| Swe 7 | Pommac | forest | 2011 | 63º07’ | 17º27’ | 265 | 961 |
| Swe 8 | Ed | agricultural | 2011 | 63º15’ | 17º14’ | 75 | 1124 |
| Swe 9 | Degerbyn | agricultural | 2011 | 64º47’ | 20º49’ | 20 | 1086 |
| Swe 10 | Degerbyn | forest | 2011 | 64º47’ | 20º49’ | 20 | 1086 |
| Ru 1 | Syktyvkar | agricultural | 2010 | 61º39’ | 50º44’ | 157 | 1075 |
| Fi 1 | Sääksjärvi | agricultural | 2002 | 60°36’ | 25°22’ | 70 | 1274 |
| Fi 2 | Sävträsk | agricultural | 2002 | 60°32’ | 26°05’ | 35 | 1322 |
| Fi 3 | Laukonsaari | agricultural | 2002 | 61°49’ | 29°20’ | 85 | 1235 |
Figure 1
Trial means of height (a) and survival (b) of hybrid aspen clones after four years (Swe1–Swe10, Ru1) and after 12 years (Fi1–Fi3) of growth in the field. Vertical bars indicate the standard error.
Figure 2
Stability (S), estimated as rank of variance over mean height (a) and mean survival (b) for each hybrid aspen clone in trials of series 1
Figure 3
Plasticity index (PI) for height over mean height (a) and mean survival (b) for each hybrid aspen clone in trials of series 1