Platte River Ecology Study

Tables

Table 14. Means of the environmental and seedling parameters for quadrats included in the upland, raised sandbar, raised sandbar with neww seedlings, sandbar, and sandbar with new seedlings sites. Within each parameter, means with the same letter are not significantly different (P < 0.05, Duncan's Multiple Range Test).

Parameters           Upland      Raised      Raised     Sandbar    Sandbar
                                 sandbar     sandbar              with new
                                            with new              seedlings
                                            seedlings

SOIL MOISTURE (%)

Average              21.8 a      22.9 a      28.4 a      12.3 b    10.0 b
Critical             19.8 a      20.3 a      28.0 a      11.8 b     9.1 b
Minimum              10.2 b      10.2 b      17.5 a       7.8 b     6.3 b

SOIL TEXTURE (%)

Coarse gravel         1.1 c       2.0 c       0.7 c      10.6 b    25.0 a
Gravel                1.2 c       6.5 b       2.9 bc     15.3 a    16.5 a
Sand                 53.5 b      61.8 ab     62.6 ab     65.2 a    51.5 b
Fine Sand            15.2 a      11.1 ab     14.6 a       4.4 b     5.9 ab
Silt                 29.0 a      18.7 b      19.1 b       4.5 c     1.0 c

WATER REGIME

Exposures (days)     77.0 b      75.5 b      74.2 b      33.6 a    49.7 ab
Average depth (cm)    0.0 c       2.4 c       3.6 bc     15.6 a     9.5 ab
Total maximum (cm)    0.0 c      30.7 b      26.1 b      73.5 a    86.0 a
Critical maximum (cm) 0.0 b       3.2 b       5.3 b      36.5 a    39.0 a

SEEDLINGS

Mature (initial)      0.7 b       0.7 b      37.6 a       0.7 b     0.0 b
New establishment     0.0 b       0.0 b       3.4 a       0.0 b     1.0 b
Total (mature + new)  0.7 b       0.7 b      41.0 a       0.7 b     1.0 b
Mortality             0.1 b       0.3 b      17.9 a       0.5 b     0.0 b