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Table 1.4. Permanent vegetation succession plots maintained under the auspices of Andrews LTER.

Plot type
Number of plots
Size
Start date Sampling interval (yrs)
Experimental watersheds

# 1 & 3 1
Trees
Understory

# 6 & 7 2
Tree seedling & understory

# 103
Trees
Understory




192
192


111


36
36




250 m2
4 m2


4 m2


150 m2
16 m2




1980
1962


1972


1973
1977




3-4
1-4


1-9


2-6
2-6

Undisturbed watersheds 4

Trees
Shrub, herb



163
163



0.1 ha
line intercept



1981
1981



6
10

Reference stands &
Growth-and yield plots
5

Sitka spruce zone
Western hemlock zone
Pacific silver fir/
mountain hemlock zone
Other




20
70
36

23




0.4-4.0 ha
0.2-4.0 ha
0.25-6.9 ha

0.5-4.5 ha




1935
1910
1972

1938




5
5-6
5-6

5

Other disturbances

Quartz Ck - debris torrent
Mt. St. Helens - eruption



262
120



1 m2
250 m2



1986
1980



5
1-5

1 clearcut logged, broadcast burned (see Table 1.3 for dates)
2 clearcut logged, broadcast burned (#6); shelterwood logged, partially broadcast burned (#7)
3 clearcut logged, not burned
4 one watershed in mature forest and one in old-growth forest
5 45 to >500 year-old stands in major forest zones of western Oregon and Washington