Sitka alder, a candidate for mixed stands

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Abstract
Juvenile height growth of Sitka alder (Alnussinuata (Regel) Rydb.), a nitrogen-fixing shrub, was examined on eight sites. The potential compatibility of mixed stands of Sitka alder and Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) was then assessed by comparing height-growth curves of the two species at early ages. Based on Sitka alder's low height and early slowdown in height growth, it appears to be a reasonable candidate for mixed stands on sites where additions of nitrogen or organic matter are desirable. On poor quality Douglas-fir sites, however, Douglas-fir should be given a head start to insure that it is not suppressed.

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