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