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Nitrogen fixation increases with successional age in boreal forests
- Zackrisson, Olle (author)
- DeLuca, Thomas Henry (author)
- Nilsson, Marie-Charlotte (author)
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- Berglund, L M (author)
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- (creator_code:org_t)
- Wiley, 2004
- 2004
- English.
- In: Ecology. - : Wiley. - 0012-9658. ; 85, s. 3327-3334
- Journal article (peer-reviewed)
Abstract
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- There is little understanding of successional dynamics of N fixation in northern boreal forests. Recent evidence suggests that N fixation by cyanobacteria in association with the common feather moss Pleurozium schreberi contributes to a significant proportion of the total N economy. The purpose of the work herein was to determine how time since last fire influences N fixation rates in boreal forests. We evaluated seasonal N fixation rates on a total of 12 natural forest preserves varying in time since last fire (35–355 years). Each site was monitored for N fixation activity using a calibrated acetylene reduction assay. Nitrogen fixation rates were found to increase linearly with time since fire. This increase in N fixation with succession is likely a function of degree of colonization by cyanobacteria and site factors such as presence of available N. Surface applications of 4.5 kg N·ha−1·yr−1 as NH4NO3 were found to eliminate N fixation while applications of P resulted in only a slight and temporary increase of N fixation rates. In contrast to common observation our findings suggest that N fixation in boreal forests becomes more important in late succession. Limited N availability in late succession is clearly one of the primary drivers of N fixation rates in boreal forest ecosystems. These findings may help to explain the origin of high rates of net N accumulation in soil unaccounted for at northern boreal sites.
Keyword
- acetylene reduction
- boreal forest
- feather mosses
- fire
- nitrogen fixation
- Pleurozium schreberi
- succession
- Sweden
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