Table 2.

The percentage of area within each community type and the percentage of sample plots without Douglas-fir seedlings for each community type for three study sites in Washington and Oregon, 2000. Community types appear in order of most resistant to least resistant to Douglas-fir seedling establishment. A separate likelihood ratio chi-square test analysis is reported for each site.

Study area (%)Community typePlots without Douglas-fir (%)
TCW
9Herb100*
9Tree/tall shrub98*
43Shrub89*
24Herb/shrub74
15Alder69
(Chi-square = 44.3; DF = 4; N = 463; P < 0.0001)
CRG
5Herb95*
55Tree/tall shrub90*
4Broom84
9Herb/shrub79
26Shrub77
(Chi-square = 13.8; DF = 4; N = 461; P < 0.01)
WF
12Tree/tall shrub82*
18Shrub77*
24Broom61
2Herb60
42Herb/shrub49
(Chi-square + 32.8; DF = 4; N = 452; P < 0.0001)
  • * Observed number of plots without Douglas-fir more than expected by random chance.