Nitrogen fixation increases with successional age in boreal forests. Zackrisson, O., DeLuca, T. H., Nilsson, M. C., Sellstedt, A., & Berglund, L. M. Ecology, 85(12):3327–3334, December, 2004. Place: Hoboken Publisher: Wiley WOS:000226297500014doi abstract bibtex 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 oil 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.
@article{zackrisson_nitrogen_2004,
title = {Nitrogen fixation increases with successional age in boreal forests},
volume = {85},
issn = {0012-9658},
doi = {10.1890/04-0461},
abstract = {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 oil 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.},
language = {English},
number = {12},
journal = {Ecology},
author = {Zackrisson, O. and DeLuca, T. H. and Nilsson, M. C. and Sellstedt, A. and Berglund, L. M.},
month = dec,
year = {2004},
note = {Place: Hoboken
Publisher: Wiley
WOS:000226297500014},
keywords = {Pleurozium schreberi, Sweden, abiotic factors, accumulation, acetylene, acetylene reduction, boreal forest, cyanobacteria, ecosystem properties, feather mosses, fire, gradient, hawaii, island area, nitrogen fixation, photosynthesis, plants, succession},
pages = {3327--3334},
}
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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. 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