Table 7-1:

Presettlement tree composition among three river valley categories within reaches 25 and 26 of the upper Mississippi River. Number of trees, relative dominance (rel. dom1), relative density (rel. den), and importance value (IV; rel. dom. + rel. den.) from GLO bearing and line tree measurements. Species are ranked by importance value for the entire study area. Importance values 10 or greater are printed in bold.



Common/scientific name		 Islands
_____________________
#       Rel.     Rel.
       Trees   Dom.  Dom.  I.V.		 Floodplains
_____________________
#       Rel.     Rel.
       Trees   Dom.  Dom.  I.V.		 Uplands
_____________________
#       Rel.     Rel.
     Trees   Dom.  Dom.  I.V.		 Entire Study Area
_____________________
#       Rel.     Rel.
   Trees   Dom.  Dom.  I.V.
White oak (Quercus alba)1    3  4  2  6    53  9  7 16    830  41  35 76    886  33  27 60
Black oak (Q. velutina)    *  *  *  *    *  *  * *    674  33  28 61    674  25  20 45
Hickory (Carya spp.)    *  *  *  *    50  4  6 10    338  9  14 23    388  8  12 20
Elm (Ulmus spp.)    18  10  11  21    105  13  13 26    97  3  4 7    220  5  7 12
Pin oak (Q. palustris)    *  *  *  *    164  24  21 45    1  0  0 0    166  5  5 10
Cottonwood (Populus deltoides)    32  36  19  55    62  12  8 20    6  1  0 1    100  4  3 7
Hackberry (Celtis occidentalis)    38  12  23  35    77  7  10 17    19  0  1 1    134  2  4 6
Ash (Fraxinus spp.)    10  9  6  15    54  6  7 13    46  1  2 3    110  3  3 6
Post oak (Q. stellata)    *  *  *  *    10  0  1 1    87  3  4 7    97  2  3 5
Blackjack oak (Q. marilandica)    *  *  *  *    4  0  1 1    95  2  4 6    99  2  3 5
Silver maple (Acer saccharinum)    11  6  7  13    52  10  7 17    1  0  0 0    64  2  2 4
Willow (Salix spp.)    7  1  4  5    39  3  5 8    *  *  * *    46  1  1 2
Basswood (Tilia americana)    *  *  *  *    2  1  0 1    26  1  1 2    28  1  1 2
Sugar maple (Acer saccharum)    *  *  *  *    *  *  * *    32  1  1 2    32  1  1 2
Boxelder (Acer negundo)    28  10  17  27    13  1  1 2    4  1  0 1    45  1  1 2
Other taxa combined3    19  12  11  23    100  10  13 23    139  4  6 10    257  5  7 12
Totals    166  100  100  200    785  100  100 200    2,395  100  100 200    3,346  100  100 200

1 on islands and floodplains, white oak was probably swamp white oak, overcup oak, and/or bur oak.
2 misidentified by GLO surveyors on the floodplain as black oak.
3 other taxa were sycamore, walnut, red oak, dogwood, mulberry, pecan, red bud, sassafras, black locust, river birch, bur oak, persimmon, honey locust, coffee tree, hawthorn, buckeye, crab tree, cherry tree, scrub oak, overcup oak, hornbeam, ironwood, pawpaw, and spanish oak.


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Last Updated: Tuesday, 15-Aug-2000 08:26:50 MDT