FLOOD04610

• County: Statewide
• Basin: Statewide
• Title: Overview of River-Floodplain Ecology in the Upper Mississippi River Basin
• Date: 12/9/1996
• Prepared By: USGS
• Floodplain - Doc Type: Educational/Technical/Reference Information

CHAPTER 3: MODIFICATIONS OF UPPER MISSISSIPPI RIVER AND EFFECTS ON FLOODPLAIN FORESTS 33
Table 3-1. Presettlement and present floodplain forest composition for portions of the open.river reach and impounded reach of the upper
Mississippi River floodplain.
Open river/Protected Open river;1Jnprotected Impounded river/Pool 26
importance value importance value importance value
Genus and species 1809 1993 1809 1993 1817 1992
In = 108) (n= 319) ... In = 745) In = 118) ... (n=96) (n = 628) ...
Ulmus spp. ....................................."..,................ 28.5 14.8 -13.7 15A 7,5 -7.9 22.1 8.7 -13A
Celtis spp. .......................................................... 25A 8.6 -16.8 9,4 3.2 -{i.2 30A 19,7 -10.7
Liquidamhar styracif7ua L.................................. 23,5 23.3 -<l.2 9.6 0.5 -9,1
Fraxinus spp. ....... ........ ........ ........, ........... ........... 21.6 21.5 -<l.1 3.7 1.6 -2.1 11.0 17,9 +6,9
Carya spp... .......... ........ ......., ........ ........... ....... ..... 10,9 4.3 -{i,6 4.6 -4,6
Quercus alba L. .................................................. 10.8 12.7 +1.9 3.1 -3.1
Fagus grandifolia Ehrh. ..................................... lOA -lOA 3.5 -3.5
Liriodendron tulipifera L.................................... 9.4 -9A
Platanus ocddentaJis L. ..................................... 7A 4.3 -3,1 51.2 11.8 -39A 2.8 1.9 -<l.9
Acer saccharinum L. .......................................... 6.5 3.4 -3.1 39.7 +39,7 16.1 86.3 +70.2
Quercus ve/utina Lam......................................... 5.9 -5.9 7.7 -7.7
Acer negundo L. ................................................. 5.8 6.3 +0.5 8.3 28.2 +19.9 5.8 14.7 +8.9
Taxodium distichum (L.) Rich. ........................... 3.9 14.6 +10.7
Fraxinus profunda (Bush) Bush. .........._............. 3.9 -3,9 0.9 -<l.9
Populus deltoides Marshall. ............................... 3.4 -3.4 80.2 36,1 -44.1 20.4 13.1 -7.3
Acer saccharum Marshall................................... 3,2 -3.2
Morus rubra L. ................................................... 2.0 -2.0 4,1 3.2 -<l.9 3.5 OA -3.1
Sassafras albidum (Nun.) Nees........................._ 2.0 -2.0 1.6 -1.6
Juglans spp. ........................................................ 1.5 1.1 -<lA 0.6 -<l.6 0.2 +0,2
Quercus Iyrata Walter......................................... 1.3 -1.3 1.2 -1.2
Gleditsia triaconlhos L....................................... 1.3 1.3 0.0 5.2 0,3 -4.9
Quercus nigra L.................................................. 1.2 -1.2
Quercus palustri,~ Muenchh................................ Ll 30.6 + 29,5 11.5 9.5 -2,0
TUia americana L. .............................................. 1.2 -1.2
Gymnodadus dioicu.~ Lam. ................................ 1.0 -1.0
SalLx spp... ....... ........... ........ ....... ........... ........ ....... 1.0 9.0 +8.0 3.3 60.3 +57.0 20.7 12.9 -7.8
Asimina tri/oba (L.) DunaJ. ................................ 0.9 -<l.9 1.5 -1.5
Quercus rubra L. ................................................ 0.7 -<l.7
Nyssa spp. ..... ........... ......... ...... ........... ........ ......... 0.5 5.4 +4.9
Querus fakata Michx. .... ........ ........... ........ ......... 0.3 13.8 +13.5
Cercis canadensis L............................................ 0.1 -<l.I 1.2 -1.2 3.1 -3.1
Acer ruhrum L. ................................................... 8.8 +8.8 7,1 +7,1
Crataegus spp. ....... ....... ......... ....... ... ........ ........... 1.0 +1.0 1.8 1.1 -<l,7
Diospyros virginiana L. ...................................... 4A +4.4 1.9 +1.9
G/editsia aqualica Marshall. .............................. 5.8 +5.8
Quercus macrocarpa Michx. .............................. 3.2 +3.2 L7 Ll -<l.6
Aescu/us glahra Willd. .........._............................ 0.7 -<l.7
Carya illinoinensis (Wangen!) K. Koeh. ........... 30.0 9.1 -20,9
/lex decidua Walter. ............................................ 0,3 -<l.3
Prunus serotina Ehrh. ..h..................................... 0.3 -<l,3
Totals .......................................................... 196.5 198.2 1.6 199.5 199,8 0.3 197,0 198.0 0.0
Note; Imponance value and change in importance value of all siems IO.Ocentimelers or greater diameter at breast heighl in the prescttlemcntcra are compared to those data for the
present. fI, number of ilems in sample size;.... change.