Vol. 51—1997 - NorthEastern Weed Science Society

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78
Table 1. Density, (D), relative density (RO), Frequency (F), relative frequency (RF),
relative ominance (ROo), and importance values (IV), for native trees at 40 home sites,
NewY o k City, New York.
D RD F RF !!dg IV
Quercus velutina 1.125 .,...., -,;).- 55.0 18.0 47.6 88.8
Quercus rubra 0.70 13.8 32.5 10.7 19.8 44.3
Comus orida 0.775 15.3 47.5 15.6 2.1 33.0
Quercus alba 0.40 7.88 27.5 9.0 8.82 25.6
0.50 9.9 7.7.5 9.0 2.17 21.1
0.30 5.91 25.0 8.2 4.2 18.3
0.20 2.54 3.9 4.1 4.91 13.0
0.225 4.43 12.5 4.1 2.5 11.0
0.175 3.04 15 4.9 2.2 10.1
0.25 4.9 12.5 4.1 0.52 9.5
0.10 1.97 10.0 3.3 2.4 7.7
Liqui bar 0.075 lA8 7.5 2.5 1.6 5.6
Styraciflua
Acerru rum .075 1A8 7.5 2.5 0.94 4.9
Moros 0.075 1.48 7.5 2.5 0.36 4.4
Ulmus eneana .05 .99 5.0 1.6 0.1 2.7