
Figure 1.
Seed regions of European larch in Poland and the locations of plus trees (red dots) whose seeds were available in the Forest Gene Bank in Kostrzyca (data as of November 2021). Green lines indicate the boundaries of seed regions (Rozporządzenie 2015), and the most valuable seed regions are additionally filled with different colours.
Table 1.
Description of the European larch seed stock available in the Forest Gene Bank in Kostrzyca (as of November 2021)
| Seed region | Md10 | Md20 | Md50 | Md51 | Md61 | Md71 | Total |
|---|---|---|---|---|---|---|---|
| Seed weight (kg) | 14.44 | 4.03 | 5.65 | 0.44 | 0.40 | 13.42 | 38.38 |
| Number of plus trees | 172 | 58 | 28 | 16 | 17 | 79 | 370 |
Table 2.
Description of plus trees’ seed collections categorised by RDLP (Regional Directorates of State Forests), seed regions and the year when seeds were harvested
| Seed region | 1998 | 2000 | 2004 | 2005 | 2006 | 2007 | 2008 | 2010 | 2011 | 2012 | 2013 | 2014 | 2017 | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RDLP Katowice | 3 | 3 | 2 | 2 | 3 | 3 | 16 | |||||||
| Md51 | 3 | 3 | 2 | 2 | 3 | 3 | 16 | |||||||
| RDLP Radom | 3 | 3 | ||||||||||||
| Md61 | 3 | 3 | ||||||||||||
| RDLP Wrocław | 59 | 2 | 13 | 3 | 8 | 6 | 8 | 1 | 2 | 2 | 7 | 111 | ||
| Md10 | 4 | 4 | ||||||||||||
| Md50 | 11 | 1 | 2 | 1 | 4 | 4 | 3 | 1 | 1 | 28 | ||||
| Md71 | 44 | 1 | 11 | 2 | 4 | 2 | 5 | 1 | 2 | 7 | 79 | |||
| Total | 59 | 2 | 3 | 16 | 5 | 8 | 8 | 11 | 1 | 2 | 5 | 3 | 7 | 130 |
Table 3.
Description of plus trees and seed collections used for establishing European larch progeny test trials
| No. of plus tree | KRLMP ID1 | IBL ID2 | Seed region | Forest District3 | Seed collection ID | Date of seed collection | Seed weight (kg) |
|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1 | MP/3/39622/05 | 16 | Md61 | Suchedniów | 23/ZP/14-D16 | 23-10-2014 | 0.023 |
| 2 | MP/3/38699/05 | 112 | Md71 | Zdroje | 472/ZP/97-D112 | 25-05-1998 | 0.147 |
| 3 | MP/3/38698/05 | 113 | Md71 | Zdroje | 8/ZP/10-D113 | 26-11-2010 | 0.028 |
| 4 | MP/3/38697/05 | 114 | Md71 | Zdroje | 473/ZP/97-D114 | 25-05-1998 | 0.559 |
| 5 | MP/3/38693/05 | 115 | Md71 | Zdroje | 474/ZP/97-D115 | 25-05-1998 | 0.070 |
| 6 | MP/3/38692/05 | 116 | Md71 | Zdroje | 9/ZP/10-D116 | 26-11-2010 | 0.179 |
| 7 | MP/3/38696/05 | 117 | Md71 | Zdroje | 10/ZP/10-D117 | 26-11-2010 | 0.020 |
| 8 | MP/3/38691/05 | 118 | Md71 | Zdroje | 475/ZP/97-D118 | 25-05-1998 | 0.140 |
| 9 | MP/3/38695/05 | 119 | Md71 | Zdroje | 476/ZP/97-D119 | 25-05-1998 | 0.215 |
| 10 | MP/3/38694/05 | 120 | Md71 | Zdroje | 477/ZP/97-D120 | 25-05-1998 | 0.245 |
| 11 | MP/3/38704/05 | 121 | Md71 | Zdroje | 478/ZP/97-D121 | 25-05-1998 | 0.240 |
| 12 | MP/3/38705/05 | 122 | Md71 | Zdroje | 479/ZP/97-D122 | 25-05-1998 | 0.492 |
| 13 | MP/3/38706/05 | 124 | Md71 | Zdroje | 480/ZP/97-D124 | 25-05-1998 | 0.208 |
| 14 | MP/3/38707/05 | 125 | Md71 | Zdroje | 482/ZP/97-D125 | 25-05-1998 | 0.317 |
| 15 | MP/3/38711/05 | 126 | Md71 | Zdroje | 148/ZP/07-D126-TP | 17-10-2007 | 0.007 |
| 16 | MP/3/38639/05 | 127 | Md71 | Bystrzyca K. | 450/ZP/97-D127 | 25-05-1998 | 0.019 |
| 17 | MP/3/38640/05 | 128 | Md71 | Bystrzyca K. | 451/ZP/97-D128 | 25-05-1998 | 0.140 |
| 18 | MP/3/38646/05 | 129 | Md71 | Bystrzyca K. | 452/ZP/97-D129 | 25-05-1998 | 0.308 |
| 19 | MP/3/38644/05 | 130 | Md71 | Bystrzyca K. | 456/ZP/97-D130 | 25-05-1998 | 0.403 |
| 20 | MP/3/38645/05 | 131 | Md71 | Bystrzyca K. | 458/ZP/97-D131 | 25-05-1998 | 0.153 |
| 21 | MP/3/33379/05 | 477 | Md51 | Prószków | 154/ZP/13-D477 | 09-07-2013 | 0.021 |
| 22 | MP/3/33382/05 | 480 | Md51 | Prószków | 155/ZP/13-D480 | 09-07-2013 | 0.018 |
| 23 | MP/3/33371/05 | 496 | Md51 | Prószków | 133/ZP/05-D496 | 18-10-2006 | 0.026 |
| 24 | MP/3/33374/05 | 499 | Md51 | Prószków | 407/ZP/01-D499 | 03-08-2004 | 0.034 |
| 25 | MP/3/33375/05 | 500 | Md51 | Prószków | 408/ZP/01-D500 | 21-01-2004 | 0.034 |
| 26 | MP/3/33376/05 | 501 | Md51 | Prószków | 409/ZP/01-D501 | 21-01-2004 | 0.020 |
| 27 | MP/3/33306/05 | 512 | Md51 | Prószków | 841/ZP/10-D512 | 24-11-2010 | 0.027 |
| 28 | MP/3/33305/05 | 523 | Md51 | Prószków | 842/ZP/10-D523 | 24-11-2010 | 0.013 |
| 29 | MP/3/33277/05 | 540 | Md51 | Prudnik | 1448/ZP/07-D540-TP | 05-08-2008 | 0.004 |
| 30 | MP/3/33279/05 | 542 | Md51 | Prudnik | 1449/ZP/07-D542-TP | 05-08-2008 | 0.003 |
| 31 | MP/3/33262/05 | 545 | Md51 | Prudnik | 132/ZP/05-DD545 | 14-07-2005 | 0.090 |
| 32 | MP/3/33265/05 | 549 | Md51 | Prudnik | 134/ZP/05-DD549 | 20-06-2005 | 0.020 |
| 33 | MP/3/38854/05 | 1598 | Md50 | Lwówek Śl. | 499/ZP/97-D1598 | 10-04-1998 | 0.136 |
| 34 | MP/3/38855/05 | 1599 | Md50 | Lwówek Śl. | 500/ZP/97-D1599 | 10-04-1998 | 0.084 |
| 35 | MP/3/38856/05 | 1601 | Md50 | Lwówek Śl. | 501/ZP/97-D1601 | 10-04-1998 | 0.716 |
| 36 | MP/3/38956/05 | 1611 | Md71 | Śnieżka | 170/ZP/05-DD1611 | 27-05-2005 | 0.546 |
| 37 | MP/3/38955/05 | 1612 | Md71 | Śnieżka | 164/ZP/05-DD1612 | 20-06-2005 | 0.112 |
| 38 | MP/3/39644/05 | 1836 | Md61 | Suchedniów | 602/ZP/13-D1836 | 23-10-2014 | 0.043 |
| 39 | MP/3/33269/05 | 2047 | Md51 | Prudnik | 130/ZP/05-D2047 | 18-10-2006 | 0.085 |
| 40 | MP/3/33307/05 | 2049 | Md51 | Prószków | 840/ZP/10-D2049 | 24-11-2010 | 0.015 |
| 41 | MP/3/33378/05 | 2051 | Md51 | Prószków | 156/ZP/13-D2051 | 09-07-2013 | 0.016 |
| 42 | MP/3/38902/05 | 2488 | Md10 | Milicz | 407/ZP/97-D2488 | 20-03-1998 | 1.002 |
| 43 | MP/3/38904/05 | 2490 | Md10 | Milicz | 405/ZP/97-D2490 | 20-03-1998 | 0.687 |
| 44 | MP/3/38906/05 | 2492 | Md10 | Milicz | 403/ZP/97-D2492 | 20-03-1998 | 0.262 |
| 45 | MP/3/38743/05 | 2496 | Md50 | Oleśnica Śl. | 274/ZP/05-D2496 | 15-11-2007 | 0.082 |
| 46 | MP/3/38741/05 | 2497 | Md50 | Oleśnica Śl. | 424/ZP/97-D2497 | 20-03-1998 | 0.051 |
| 47 | MP/3/38742/05 | 2498 | Md50 | Oleśnica Śl. | 919/ZP/07-D2498-TP | 19-02-2008 | 0.018 |
| 48 | MP/3/38744/05 | 2502 | Md50 | Oleśnica Śl. | 267/ZP/05-D2502 | 23-08-2007 | 0.016 |
| 49 | MP/3/38725/05 | 2503 | Md50 | Oleśnica Śl. | 263/ZP/05-D2503 | 15-03-2006 | 0.594 |
| 50 | MP/3/38726/05 | 2504 | Md50 | Oleśnica Śl. | 270/ZP/05-D2504 | 23-08-2007 | 0.066 |
| 51 | MP/3/38864/05 | 2507 | Md50 | Lwówek Śl. | 180/ZP/10-D2507 | 23-11-2010 | 0.038 |
| 52 | MP/3/38596/05 | 2703 | Md71 | Bardo Śl. | 105/ZP/13-D2703 | 09-07-2013 | 0.025 |
| 53 | MP/3/38595/05 | 2704 | Md71 | Bardo Śl. | 504/ZP/09-D2704 | 26-11-2010 | 0.017 |
| 54 | MP/3/38642/05 | 2706 | Md71 | Bystrzyca K. | 460/ZP/97-D2706 | 25-05-1998 | 0.099 |
| 55 | MP/3/38641/05 | 2708 | Md71 | Bystrzyca K. | 463/ZP/97-D2708 | 25-05-1998 | 0.162 |
| 56 | MP/3/38635/05 | 2710 | Md71 | Bystrzyca K. | 466/ZP/97-D2710 | 25-05-1998 | 0.022 |
| 57 | MP/3/38634/05 | 2711 | Md71 | Bystrzyca K. | 467/ZP/97-D2711 | 25-05-1998 | 0.013 |
| 58 | MP/3/38638/05 | 2712 | Md71 | Bystrzyca K. | 468/ZP/97-D2712 | 25-05-1998 | 0.431 |
| 59 | MP/3/38637/05 | 2713 | Md71 | Bystrzyca K. | 470/ZP/97-D2713 | 25-05-1998 | 0.008 |
| 60 | MP/3/38636/05 | 2714 | Md71 | Bystrzyca K. | 471/ZP/97-D2714 | 25-05-1998 | 0.006 |
| 61 | MP/3/38871/05 | 2718 | Md71 | Międzylesie | 498/ZP/97-D2718 | 25-05-1998 | 0.292 |
| 62 | MP/3/38714/05 | 2719 | Md71 | Zdroje | 483/ZP/97-D2719 | 25-05-1998 | 0.218 |
| 63 | MP/3/38703/05 | 2720 | Md71 | Zdroje | 484/ZP/97-D2720 | 25-05-1998 | 0.544 |
| 64 | MP/3/38700/05 | 2721 | Md71 | Zdroje | 485/ZP/97-D2721 | 25-05-1998 | 0.162 |
| 65 | MP/3/38972/05 | 2752 | Md71 | Wałbrzych | 437/ZP/97-D2752 | 10-04-1998 | 0.013 |
| 66 | MP/3/38786/05 | 2754 | Md71 | Kamienna G. | 74/ZP/08-D2754-TP | 01-08-2008 | 0.010 |
| 67 | MP/3/38798/05 | 2755 | Md71 | Kamienna G. | 440/ZP/97-D2755 | 10-04-1998 | 0.168 |
| 68 | MP/3/38797/05 | 2756 | Md71 | Kamienna G. | 441/ZP/97-D2756 | 10-04-1998 | 0.092 |
| 69 | MP/3/38950/05 | 2757 | Md71 | Śnieżka | 171/ZP/05-DD2757 | 20-06-2005 | 0.429 |
| 70 | MP/3/38949/05 | 2758 | Md71 | Śnieżka | 172/ZP/05-DD2758 | 20-06-2005 | 0.324 |
| 71 | MP/3/38948/05 | 2760 | Md71 | Śnieżka | 173/ZP/05-DD2760 | 20-06-2005 | 0.435 |
| 72 | MP/3/38861/05 | 2763 | Md50 | Lwówek Śl. | 503/ZP/97-D2763 | 10-04-1998 | 0.551 |
| 73 | MP/3/38859/05 | 2765 | Md50 | Lwówek Śl. | 505/ZP/97-D2765 | 10-04-1998 | 0.353 |
| 74 | MP/3/38858/05 | 2766 | Md50 | Lwówek Śl. | 506/ZP/97-D2766 | 10-04-1998 | 0.123 |
| 75 | MP/3/38745/05 | 2769 | Md50 | Jawor | 240/ZP/10-D2769 | 21-12-2011 | 0.018 |
| 76 | MP/3/40494/05 | 2773 | Md50 | Pieńsk | 643/ZP/97-D2773 | 22-08-2000 | 0.075 |
| 77 | MP/3/38724/05 | 2780 | Md50 | Głogów | 416/ZP/97-D2780 | 20-03-1998 | 0.181 |
| 78 | MP/3/38720/05 | 2782 | Md50 | Głogów | 414/ZP/97-D2782 | 20-03-1998 | 0.165 |
| 79 | MP/3/38721/05 | 2783 | Md50 | Głogów | 412/ZP/97-D2783 | 20-03-1998 | 0.079 |
| 80 | MP/3/38722/05 | 2784 | Md50 | Głogów | 540/ZP/11-D2784 | 10-05-2012 | 0.017 |
| 81 | MP/3/38918/05 | 3018 | Md50 | Oborniki Śl. | 274/ZP/10-D3018 | 23-11-2010 | 0.009 |
| 82 | MP/3/38916/05 | 3020 | Md50 | Oborniki Śl. | 275/ZP/10-D3020 | 23-11-2010 | 0.052 |
| 83 | MP/3/38917/05 | 3021 | Md50 | Oborniki Śl. | 427/ZP/97-D3021 | 20-03-1998 | 0.672 |
| 84 | MP/3/38734/05 | 3029 | Md50 | Oleśnica Śl. | 261/ZP/05-D3029 | 23-08-2007 | 0.078 |
| 85 | MP/3/38733/05 | 3033 | Md50 | Oleśnica Śl. | 909/ZP/07-D3033-TP | 19-02-2008 | 0.056 |
| 86 | MP/3/38727/05 | 3034 | Md50 | Oleśnica Śl. | 910/ZP/07-D3034 | 19-02-2008 | 0.079 |
| 87 | MP/3/38730/05 | 3038 | Md50 | Oleśnica Śl. | 272/ZP/05-DD3038 | 14-07-2005 | 0.162 |
| 88 | MP/3/38731/05 | 3039 | Md50 | Oleśnica Śl. | 911/ZP/07-D3039-TP | 19-02-2008 | 0.046 |
| 89 | MP/3/38732/05 | 3040 | Md50 | Oleśnica Śl. | 262/ZP/05-DD3040 | 20-06-2005 | 0.322 |
| 90 | MP/3/38910/05 | 3045 | Md10 | Milicz | 400/ZP/97-D3045 | 20-03-1998 | 0.146 |
| 91 | MP/3/38784/05 | 3283 | Md71 | Kamienna G. | 442/ZP/97-D3283 | 10-04-1998 | 0.366 |
| 92 | MP/3/38795/05 | 3288 | Md71 | Kamienna G. | 443/ZP/97-D3288 | 10-04-1998 | 0.079 |
| 93 | MP/3/38796/05 | 3289 | Md71 | Kamienna G. | 445/ZP/97-D3289 | 10-04-1998 | 0.204 |
| 94 | MP/3/38690/05 | 3579 | Md71 | Zdroje | 11/ZP/10-D3579 | 26-11-2010 | 0.021 |
| 95 | MP/3/38702/05 | 3580 | Md71 | Zdroje | 487/ZP/97-D3580 | 25-05-1998 | 0.317 |
| 96 | MP/3/38701/05 | 3581 | Md71 | Zdroje | 488/ZP/97-D3581 | 25-05-1998 | 0.494 |
| 97 | MP/3/38708/05 | 3582 | Md71 | Zdroje | 489/ZP/97-D3582 | 25-05-1998 | 0.031 |
| 98 | MP/3/38709/05 | 3583 | Md71 | Zdroje | 490/ZP/97-D3583 | 25-05-1998 | 0.008 |
| 99 | MP/3/38713/05 | 3584 | Md71 | Zdroje | 491/ZP/97-D3584 | 25-05-1998 | 0.051 |
| 100 | MP/3/38710/05 | 3585 | Md71 | Zdroje | 492/ZP/97-D3585 | 25-05-1998 | 0.030 |
| 101 | MP/3/38712/05 | 3586 | Md71 | Zdroje | 493/ZP/97-D3586 | 25-05-1998 | 0.009 |
| 102 | MP/3/38689/05 | 3587 | Md71 | Zdroje | 494/ZP/97-D3587 | 25-05-1998 | 0.236 |
| 103 | MP/3/39635/05 | 4097 | Md61 | Suchedniów | 603/ZP/13-D4097 | 23-10-2014 | 0.050 |
| 104 | MP/3/33270/05 | 5635 | Md51 | Prudnik | 131/ZP/05-DD5635 | 14-07-2005 | 0.019 |
| 105 | MP/3/38931/05 | 6848 | Md71 | Szklarska P. | 197/ZP/17-D6848 | 26-04-2017 | 0.049 |
| 106 | MP/3/38924/05 | 6850 | Md71 | Szklarska P. | 642/ZP/97-D6850 | 22-08-2000 | 0.062 |
| 107 | MP/3/38936/05 | 6851 | Md71 | Szklarska P. | 821/ZP/07-D6851 | 24-02-2017 | 0.019 |
| 108 | MP/3/38933/05 | 6852 | Md71 | Szklarska P. | 160/ZP/07-D6852 | 24-02-2017 | 0.037 |
| 109 | MP/3/38935/05 | 6853 | Md71 | Szklarska P. | 34/ZP/12-D6853 | 10-05-2012 | 0.023 |
| 110 | MP/3/38934/05 | 6854 | Md71 | Szklarska P. | 26/ZP/05-D6854 | 12-04-2006 | 0.415 |
| 111 | MP/3/46964/06 | 6855 | Md71 | Świeradów | 815/ZP/07-D6855-TP | 27-08-2007 | 0.016 |
| 112 | MP/3/46965/06 | 6856 | Md71 | Świeradów | 816/ZP/07-D6856-TP | 27-08-2007 | 0.039 |
| 113 | MP/3/46966/06 | 6857 | Md71 | Świeradów | 817/ZP/07-D6857-TP | 27-08-2007 | 0.049 |
| 114 | MP/3/38783/05 | 6888 | Md71 | Kamienna G. | 446/ZP/97-D6888 | 10-04-1998 | 0.078 |
| 115 | MP/3/38782/05 | 6889 | Md71 | Kamienna G. | 447/ZP/97-D6889 | 10-04-1998 | 0.012 |
| 116 | MP/3/38779/05 | 6891 | Md71 | Kamienna G. | 448/ZP/97-D6891 | 10-04-1998 | 0.177 |
| 117 | MP/3/38780/05 | 6892 | Md71 | Kamienna G. | 449/ZP/97-D6892 | 10-04-1998 | 0.034 |
| 118 | MP/3/38781/05 | 6893 | Md71 | Kamienna G. | 69/ZP/08-D6893-TP | 18-09-2008 | 0.006 |
| 119 | MP/3/38957/05 | 6904 | Md71 | Śnieżka | 169/ZP/05-DD6904 | 20-06-2005 | 0.148 |
| 120 | MP/3/38946/05 | 6906 | Md71 | Śnieżka | 163/ZP/05-DD6906 | 25-05-2005 | 0.326 |
| 121 | MP/3/38945/05 | 6907 | Md71 | Śnieżka | 165/ZP/05-DD6907 | 25-05-2005 | 0.220 |
| 122 | MP/3/38944/05 | 6908 | Md71 | Śnieżka | 166/ZP/05-DD6908 | 14-07-2005 | 0.182 |
| 123 | MP/3/38926/05 | 6911 | Md71 | Szklarska P. | 163/ZP/07-D6911 | 24-02-2017 | 0.023 |
| 124 | MP/3/38932/05 | 6912 | Md71 | Szklarska P. | 198/ZP/17-D6912 | 26-04-2017 | 0.018 |
| 125 | MP/3/38928/05 | 6943 | Md71 | Szklarska P. | 199/ZP/17-D6943 | 26-04-2017 | 0.052 |
| 126 | MP/3/38930/05 | 6945 | Md71 | Szklarska P. | 67/ZP/12-D6945 | 10-01-2013 | 0.017 |
| 127 | MP/3/38929/05 | 6946 | Md71 | Szklarska P. | 823/ZP/07-D6946 | 24-02-2017 | 0.053 |
| 128 | MP/3/38958/05 | 6956 | Md71 | Śnieżka | 162/ZP/05-DD6956 | 20-06-2005 | 0.180 |
| 129 | MP/3/38942/05 | 6957 | Md71 | Śnieżka | 167/ZP/05-DD6957 | 13-07-2005 | 0.172 |
| 130 | MP/3/38943/05 | 6958 | Md71 | Śnieżka | 168/ZP/05-D6958 | 15-03-2006 | 0.034 |
1 KRLMP ID – plus tree ID number according to National Register of Forest Basic Material (https://bnl.gov.pl/krajowy_rejestr_lesnego_materialu_podstawowego,109.asp);
Table 4.
Description of European larch progeny test trials established in spring 2023
| ID1 | 204/Md/D/I/1/DM1 | 205/Md/D/I/2/DM1 | 206/Md/D/I/3/DM1 | 207/Md/D/I/4/DM1 | 208/Md/D/I/5/DM1 | 209/Md/D/I/6/DM1 |
|---|---|---|---|---|---|---|
| Testing region | I | I | I | I | I | I |
| Regional Directorate | Gdańsk | Szczecinek | Szczecin | Poznań | Katowice | Wrocław |
| Forest District | Kartuzy | Miastko | Bogdaniec | Babki | Opole | Wałbrzych |
| Forest Range | Wieżyca | Biały Bór | Bogdaniec | Babki | Krasiejów | Wałbrzych |
| Forestry | Sikorzyno | Biały Bór | Białcz | Mieczewo | Dąbrowice | Stare Bogaczowice |
| Compartment | 167d | 714a | 559f | 132d | 24a | 61m |
| Latitude (N) | 54.1756 | 53.8878 | 52.6954 | 52.2531 | 50.7512 | 50.8231 |
| Longitude (E) | 18.0402 | 16.8133 | 14.9156 | 17.0161 | 18.3546 | 16.2121 |
| Altitude (masl)2 | 207 | 184 | 57 | 94 | 236 | 476 |
| Number of half-sib families | 130 | 130 | 130 | 130 | 130 | 130 |
| Total number of seedlings | 6267 | 7503 | 6272 | 6267 | 6267 | 5482 |
| Supervisor3 | IBL | IBL | IBL | UP Poznań | UR Kraków | IBL |
| Forest site type4 | R IV a | BMśw | BMśw | Lśw | LMśw | LMGśw |
| Land type | Agricultural land | Clear-cut | Clear-cut | Clear-cut | Clear-cut | Clear-cut |
| Spacing | 2 × 2 | 2 × 2 | 2 × 2 | 2 × 2 | 2 × 2 | 2.5 × 2 |
2 Altitude (meters above sea level) defined with FreeMapTools according to the coordinates of the sites (https://www.freemaptools.com/elevation-finder.htm);
3 IBL – Forest Research Institute, UP Poznań – Poznan University of Life Sciences, UR Kraków – University of Agriculture in Krakow;
4 R IVa – arable soils of average quality (Class IV a; Rozporządzenie 2012), BMśw – mixed coniferous forests, LMśw – mixed deciduous forest, LMGśw – mixed deciduous mountain forest, Lśw – deciduous forest (Święcicki 2012).

Figure 2.
Location of European larch progeny test trials (established spring 2023) with Forest District as labels (detailed trial descriptions in Tab. 4). Regional Directorates of State Forests (RDLP) boundaries in Poland indicated by gray lines