Abstract
Annual N 2-fixation by Sitka alder ( Alnus viridis (Chaix) DC. ssp. sinuata (Regel) A.&D. Love) was estimated at 10–15 kg N ha −1 over three growing seasons in a young lodgepole pine ( Pinus contorta Dougl. ex Loud.) stand in the Sub-Boreal Spruce biogeoclimatic zone of British Columbia (BC), Canada. Unlike the ambiguous evidence provided by 15N natural abundance, the isotope dilution method indicated that >90% of the N in new alder tissues was derived from the atmosphere. Despite low light levels (18.1% of open sky values), alders growing under a mature lodgepole pine canopy (>150-year-old) obtained a similarly high proportion of their N requirements by N 2-fixation.
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