Arboriculture & Urban Forestry 47(4): July 2021 155 Table 2. Mean values and standard deviation of age, diameter at breast height (DBH), tree height (TH), crown diameter (CD), crown length (CL), crown projection area (CPA), crown volume (CV), and tree pit, together with the sample size (n) of each species (A. hippocastanum, P. × hispanica, R. pseudoacacia, and T. cordata) in the chosen cities of Bayreuth, Hof, Kempten, Munich, Nuremberg, and Würzburg. n Age (years) A. hippocastanum 590 67.93 ± 31.9 Bayreuth Hof Kempten Munich Nuremberg Würzburg P. × hispanica Bayreuth Hof Kempten Munich Nuremberg Würzburg R. pseudoacacia Bayreuth Hof Kempten Munich Nuremberg Würzburg T. cordata Bayreuth Hof Kempten Munich Nuremberg Würzburg 102 65 55 231 62 75 62.8 ± 31.9 53.4 ± 25.3 60.8 ± 41.4 83.8 ± 24.6 56.1 ± 31.9 53.7 ± 28.8 448 37.51 ± 20.2 103 41.23 ± 23.1 33 39 111 82 79 412 100 17 38 106 62 89 553 108 62 61 159 77 86 18.5 ± 6.9 29.1 ± 11.5 39.5 ± 20.6 46.6 ± 21.1 33.1 ± 12.6 39.5 ± 18.2 39.6 ± 14.2 21.8 ± 13.6 39.3 ± 17.6 35.5 ± 19.6 45.2 ± 15.1 43.9 ± 20.4 44.3 ± 21.8 52.0 ± 29.6 36.9 ± 14.2 45.2 ± 18.2 42.5 ± 19.3 46.4 ± 21.7 41.0 ± 19.1 DBH (cm) 50.1 ± 21.7 42.8 ± 19.9 40.7 ± 18.1 44.5 ± 28.9 63.3 ± 14.8 41.2 ± 20.3 38.6 ± 19.3 37.1 ± 20.0 40.8 ± 22.9 18.3 ± 6.8 28.8 ± 11.4 39.1 ± 20.4 46.1 ± 20.9 37.3 ± 21.2 39.7 ± 18.3 39.7 ± 14.2 21.9 ± 13.7 39.4 ± 17.6 35.6 ± 19.8 45.4 ± 15.2 44.1 ± 20.4 33.0 ± 17.2 38.8 ± 23.3 27.4 ± 11.6 33.7 ± 14.6 31.4 ± 15.2 34.5 ± 16.9 30.5 ± 15.3 TH (m) 14.4 ± 4.7 15.0 ± 5.9 12.3 ± 4.1 12.6 ± 4.8 16.1 ± 3.5 13.0 ± 4.4 13.0 ± 4.7 15.7 ± 5.2 16.7 ± 5.7 10.4 ± 2.4 14.0 ± 3.8 16.0 ± 4.9 18.1 ± 5.5 15.7 ± 4.6 14.5 ± 4.7 15.7 ± 5.0 9.7 ± 3.3 14.4 ± 4.7 13.9 ± 4.7 14.1 ± 3.8 15.4 ± 4.7 13.0 ± 4.5 14.0 ± 6.1 11.3 ± 3.3 13.4 ± 8.9 12.9 ± 4.1 13.5 ± 4.3 12.2 ± 4.6 CD (m) 9.7 ± 3.1 9.3 ± 3.6 7.8 ± 2.6 9.2 ± 3.6 11.0 ± 2.2 9.1 ± 3.2 8.9 ± 2.8 11.2 ± 4.5 12.1 ± 5.1 6.0 ± 2.3 9.8 ± 3.1 11.6 ± 4.7 11.9 ± 4.2 11.9 ± 4.0 9.1 ± 2.9 9.3 ± 2.2 6.1 ± 2.4 9.7 ± 2.8 8.0 ± 2.8 9.5 ± 2.6 CL (m) 11.4 ± 4.4 11.7 ± 5.5 9.1 ± 3.9 10.0 ± 4.5 12.8 ± 3.4 10.2 ± 4.2 10.3 ± 4.0 CPA (m2 ) 81.7 ± 48.0 CV (m3 ) 1,081.5 ± 927.8 583.7 ± 546.4 958.4 ± 997.5 1,339.2 ± 780.1 917.3 ± 1,053.8 856.3 ± 789.3 Tree pit (m2 ) 101.9 ± 105.3 77.7 ± 56.1 1,147.1 ± 1,183.3 136.7 ± 107.0 53.2 ± 33.0 75.9 ± 52.6 99.4 ± 39.9 72.9 ± 53.0 69.0 ± 43.1 116.8 ± 100.7 105.8 ± 94.1 32.7 ± 25.3 170.7 ± 135.6 202.6 ± 102.0 12.2 ± 5.1 113.7 ± 88.2 1,759.8 ± 2,049.3 285.1 ± 654.1 12.8 ± 5.7 7.3 ± 1.8 10.7 ± 3.4 12.5 ± 5.2 14.6 ± 5.5 12.1 ± 4.3 10.7 ± 4.0 11.4 ± 4.1 7.0 ± 2.8 11.4 ± 4.2 9.6 ± 3.9 10.5 ± 3.2 10.0 ± 3.1 11.8 ± 4.1 8.1 ± 3.1 8.7 ± 3.7 6.8 ± 2.2 8.3 ± 2.5 7.6 ± 2.9 8.7 ± 2.8 8.3 ± 3.1 9.6 ± 4.1 10.1 ± 5.5 8.0 ± 2.9 10.2 ± 3.4 9.6 ± 3.7 10.2 ± 3.8 9.3 ± 3.9 136 ± 104.2 2,232.1 ± 2,513.8 31.9 ± 25.5 83.4 ± 48.1 264.8 ± 266.3 1,028.1 ± 816.3 96.9 ± 91.4 38.0 ± 64.9 57.0 ± 57.3 123.1 ± 95.9 1,983.5 ± 2,117.8 874.7 ± 1,111.5 125.4 ± 89.2 2,192.5 ± 2,425.4 96.6 ± 114.0 124.1 ± 87.5 1,836.6 ± 2,325.3 116.3 ± 102.9 70.9 ± 44.8 72.5 ± 32.4 31.0 ± 29.7 80.0 ± 39.2 56.0 ± 36.3 76.2 ± 42.2 873.9 ± 816.5 885.1 ± 625.1 280.8 ± 427.1 1,027.8 ± 673.7 669.6 ± 640.6 878.4 ± 694.0 70.7 ± 56.7 39.9 ± 23.7 59.6 ± 32.1 52.3 ± 38.0 65.3 ± 40.7 62.1 ± 42.8 705.8 ± 790.3 944.4 ± 1,135.5 372.3 ± 324.3 698.9 ± 521.9 617.3 ± 678.1 806.6 ± 821.1 723 ± 725.6 103.4 ± 102.1 122.1 ± 106.8 93.9 ± 85.8 127.2 ± 90.9 99.2 ± 93.2 94.0 ± 101.1 86.3 ± 52.7 1,164.1 ± 1,072.1 111.0 ± 118.0 58.7 ± 42.6 567 ± 82.2 89.3 ± 104.9 877.5 ± 3,537.1 106.4 ± 107.4 115.6 ± 101.5 321.7 ± 1,932.4 98.7 ± 96.9 LAI 2.2). Similar comparisons can be made for other DBH values for the 4 species (Figure 3 and Table 3). Growth Differences Between Species and Cities Figure 4 provides an overview of tree height growth over DBH of the 4 analyzed tree species in the 6 cit- ies. It is obvious that P. × hispanica showed the fast- est height increment in all cities (P < 0.001). Only in Bayreuth, R. pseudoacacia had a faster height development for bigger trees. R. pseudoacacia and T. cordata showed mostly an intermediate tree height increment, while A. hippocastanum had the lowest increment compared to the other species. This varied for some cities, e.g., in Nuremberg, older R. pseudoa- cacia showed a slower height development than the other species. On the other hand, in Hof, Kempten, Munich, and Würzburg, older T. cordata experienced a faster height growth than R. pseudoacacia and A. hippocastanum. ©2021 International Society of Arboriculture
July 2021
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