Binkley, Dan. 1984. Douglas-fir stem growth per unit of leaf area increased by interplanted Sitka alder and red alder. Forest Science. 30(1): 259-263.
Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] stem growth per unit of leaf areawas compared in the presence and absence of Sitka alder (Alnus sinuata) and red alder (Alnusrubra). The apparent effect of the alders differed with the method used to calculate the ratio. WhenDouglas-fir's rating was calculated from conversion ratios for sapwood area to leafarea as measuredat each site, it was increased 40 percent by the presence of Sitka alder and 250 percent by redalder. This increased stem growth per unit of leaf area probably resulted from both greater netphotosynthetic rates and a shift in within-tree photosynthate allocation. Fouast Set. 30:259-263.
ADDITIONAL KEY WORDS. Pseudotsuga menziesii, leaf area, net primary production, photosyn-thesis allocation.