Canadian Forest Service Publications

N2-fixation by Sitka alder in a young lodgepole pine stand in central interior British Columbia, Canada. 2002. Sanborn, P.; Preston, C.M.; Brockley, R.P. Forest Ecology and Management 167: 223-231.

Year: 2002

Issued by: Pacific Forestry Centre

Catalog ID: 20256

Language: English

Availability: PDF (request by e-mail)

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Abstract

Annual N2-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 N2-fixation.