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Ecological Studies at the Woodworth Study Area

Effects of Water Level Changes on Prairie Pothole Vegetation Structure and Diversity in the Woodworth Study Area, North Dakota

Table 1
Table 1. Water depth, percent cover and average vegetation height, pre- and post-flooding. NP = native prairie, CRP = Conservation Reserve Program, SE = shallow emergent/shallow marsh zone, WM = wet meadow zone. 
                                                Date           
Parameter                          6/93         6/94         7/94

Water Depth (cm)
Aver. deepest pt , NP sites1        31           106          103 
Aver. deepest pt , CRP sites1       15            49           46 

Vegetative Cover  (%)
 NP  open water  SE                 61            80           81 
 NP  open water  WM                  0            69           46 
 CRP open water  SE                 35            53           41 
 CRP open water  WM                  8            25           20 

	
Vegetation Density (shoots/m2)
 NP   SE  graminoid                114           107           34
 NP   SE  forb                      93            32           19 
 NP   WM  graminoid                695           211          218 
 NP   WM  forb                     272            48           28 
 CRP  SE  graminoid                526            94           86 
 CRP  SE  forb                     123            98           88 
 CRP  WM  graminoid               1533           436          514 
 CRP  WM  forb                     126           263          186 

Aver. Vegetation Height (cm)
 NP   SE                            32           110          114 
 NP   WM                            20            67           82 
 CRP  SE                            33            79           85 
 CRP  WM                            35            58           72
1Average of the water depths at the deepest points in the five NP or CRP wetlands, for each month stated.

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