Seasonal and Diurnal Patterns and Rates of Nitrogen Fixation by Young Red Alder
Annual and diurnal N2 fixation by red alder was monitored using the acetylene (C2H2) reduction method. Two- and three-year-old red alder, which had naturally seeded on spoil materials from a coal mine near Centralia, Washington, were used in this study. Dinitrogen (C2H2) fixation occurred during a 7-month period which corresponded to the growing season for alder. Mean C2H2 reduction for the period was 27.5 moles/g dry nodule/hr. Maximum rates of fixation occurred in May and June. Diurnal patterns showed highest rates at midday, with midday rates being four to six times greater than night rates. Total N fixed for the growing season averaged 7.7 g N/tree, which represented approximately 70 percent of the total N accumulated by the plant during the growing season. At a stand density of 8,000 trees/ha, which is the average stand density of the area sampled, annual N fixed was estimated at 62 kg/ha. Forest Sci. 25:371-380.
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Document Type: Journal Article
Affiliations: Forest Scientist, Western Washington Research & Extension Center, Puyallup, Washington
Publication date: 1979-06-01
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