Ecological Archives A014-005-A3

Scott D. Wilson, Jonathan D. Bakker, Janice M. Christian, Xingdong Li, Laura G. Ambrose, and John Waddington. 2004. Semiarid old-field restoration: is neighbor control needed? Ecological Applications 14:476–484.

Appendix C. Effects of neighbor control (C), seeding method (S), and mulch (M) on the total cover of nonnative species, the total cover of native species, and species richness in three seeding years. All measurements were made in August of the year after seeding.

   
Nonnative cover
 
Native cover
 
Species richness
   
df
SS
F
P
 
SS
F
P
 
SS
F
P
                           
Plots seeded in 1994                          
Control  
1
6.950
58.76
0.000
 
0.211
1.83
0.182
 
11.350
94.93
0.000
Seed  
2
0.177
0.75
0.479
 
0.973
4.22
0.020
 
2.690
11.24
0.000
Mulch  
1
0.403
3.41
0.071
 
0.037
0.32
0.573
 
0.092
0.77
0.384
C × S  
2
0.342
1.45
0.246
 
1.210
5.27
0.009
 
0.369
1.54
0.225
C × M  
1
0.140
1.18
0.283
 
0.005
0.04
0.841
 
0.031
0.26
0.611
S × M  
2
0.030
0.13
0.880
 
0.310
1.35
0.270
 
0.602
2.52
0.091
C × S × M  
2
0.083
0.35
0.706
 
0.170
0.74
0.483
 
0.011
0.04
0.957
Error  
48
5.680
 
 
 
5.530
 
 
 
5.740
 
 
Total  
59
13.800
 
 
 
8.450
 
 
 
20.880
 
 
                           
Plots seeded in 1995  
 
 
 
 
 
 
 
 
 
 
 
 
Control  
1
1.550
19.19
0.000
 
0.173
1.47
0.230
 
0.523
7.36
0.008
Seed  
2
0.399
2.47
0.094
 
1.340
5.69
0.006
 
2.630
18.50
0.000
C × S  
2
0.482
2.98
0.059
 
0.297
1.26
0.292
 
0.006
0.05
0.956
Error  
54
4.360
 
 
 
6.350
 
 
 
3.840
 
 
Total  
59
6.790
 
 
 
8.160
 
 
 
7.000
 
 
                           
Plots seeded in 1996                          
Mulch  
1
0.348
3.02
0.099
 
0.155
2.44
0.136
 
0.187
1.46
0.243
Error  
18
2.070
 
 
 
1.150
 
 
 
2.310
 
 
Total  
19
2.420
 
 
 
1.300
 
 
 
2.500
 
 
                           
Control  
1
0.204
2.58
0.114
 
0.272
3.10
0.084
 
0.582
6.31
0.015
Seed  
2
0.156
0.99
0.379
 
0.218
1.24
0.297
 
1.300
7.05
0.002
C × S  
2
0.420
2.66
0.079
 
0.042
0.24
0.787
 
0.110
0.60
0.555
Error  
54
4.270
 
 
 
4.740
 
 
 
4.980
 
 
Total  
59
5.050
 
 
 
5.270
 
 
 
6.980
 
 

   Notes: All statistics are from ANOVAs within each seeding year. Significant F values are in bold. Neighbor control (applied or not) and seeding method (unseeded, broadcast, drilled) were main factors in all sites and years. Mulch (applied or not) was a main factor in the 1994 seeding year. In the 1996 seeding year, mulch effects in plots that received neighbor control and broadcast seeding were examined with one-way ANOVA. The native hay seeding method was omitted from the analyses. Cover data were arc-sin square root transformed and species richness data were log-transformed prior to analysis. All SS have been multiplied by 10 for presentation.



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