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Notes: Douglas-fir Stem Growth per Unit of Leaf Area Increased by Interplanted Sitka Alder and Red Alder

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Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] stem growth per unit of leaf area was compared in the presence and absence of Sitka alder (Alnus sinuata) and red alder (Alnus rubra). The apparent effect of the alders differed with the method used to calculate the ratio. When Douglas-fir's rating was calculated from conversion ratios for sapwood area to leaf area as measured at each site, it was increased 40 percent by the presence of Sitka alder and 250 percent by red alder. This increased stem growth per unit of leaf area probably resulted from both greater net photosynthetic rates and a shift in within-tree photosynthate allocation. Forest Sci. 30:259-263.

Keywords: Pseudotsuga menziesii; leaf area; net primary production; photosynthesis allocation

Document Type: Miscellaneous

Affiliations: Graduate Research Assistant, School of Forestry and Environmental Studies, Duke University, Durham, NC 27706

Publication date: March 1, 1984

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