Anthropogenic N deposition and the fate of 15 NO 3 − in a northern hardwood ecosystem
dc.contributor.author | Zak, Donald R. | en_US |
dc.contributor.author | Pregitzer, Kurt S. | en_US |
dc.contributor.author | Holmes, William E. | en_US |
dc.contributor.author | Burton, Andrew J. | en_US |
dc.contributor.author | Zogg, Gregory P. | en_US |
dc.date.accessioned | 2006-09-08T20:23:01Z | |
dc.date.available | 2006-09-08T20:23:01Z | |
dc.date.issued | 2004-06 | en_US |
dc.identifier.citation | Zak, Donald R.; Pregitzer, Kurt S.; Holmes, William E.; Burton, Andrew J.; Zogg, Gregory P.; (2004). "Anthropogenic N deposition and the fate of 15 NO 3 − in a northern hardwood ecosystem." Biogeochemistry 69(2): 143-157. <http://hdl.handle.net/2027.42/42478> | en_US |
dc.identifier.issn | 0168-2563 | en_US |
dc.identifier.issn | 1573-515X | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/42478 | |
dc.description.abstract | Human activity has substantially increased atmospheric NO 3 − deposition in many regions of the Earth, which could lead to the N saturation of terrestrial ecosystems. Sugar maple ( Acer saccharum Marsh.) dominated northern hardwood forests in the Upper Great Lakes region may be particularly sensitive to chronic NO 3 − deposition, because relatively moderate experimental increases (three times ambient) have resulted in substantial N leaching over a relatively short duration (5–7 years). Although microbial immobilization is an initial sink (i.e., within 1–2 days) for anthropogenic NO 3 − in this ecosystem, we have an incomplete understanding of the processes controlling the longer-term (i.e., after 1 year) retention and flow of anthropogenic N. Our objectives were to determine: (i) whether chronic NO 3 − additions have altered the N content of major ecosystem pools, and (ii) the longer-term fate of 15 NO 3 − in plots receiving chronic NO 3 − addition. We addressed these objectives using a field experiment in which three northern hardwood plots receive ambient atmospheric N deposition (ca. 0.9 g N m −2 year −1 ) and three plots which receive ambient plus experimental N deposition (3.0 g NO 3 − -N m −2 year −1 ). Chronic NO 3 − deposition significantly increased the N concentration and content (g N/m 2 ) of canopy leaves, which contained 72% more N than the control treatment. However, chronic NO 3 − deposition did not significantly alter the biomass, N concentration or N content of any other ecosystem pool. The largest portion of 15 N recovered after 1 year occurred in overstory leaves and branches (10%). In contrast, we recovered virtually none of the isotope in soil organic matter (SOM), indicating that SOM was not a sink for anthropogenic NO 3 − over a 1 year duration. Our results indicate that anthropogenic NO 3 − initially assimilated by the microbial community is released into soil solution where it is subsequently taken up by overstory trees and allocated to the canopy. Anthropogenic N appears to be incorporated into SOM only after it is returned to the forest floor and soil via leaf litter fall. Short- and long-term isotope tracing studies provided very different results and illustrate the need to understand the physiological processes controlling the flow of anthropogenic N in terrestrial ecosystems and the specific time steps over which they operate. | en_US |
dc.format.extent | 134249 bytes | |
dc.format.extent | 3115 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Kluwer Academic Publishers; Springer Science+Business Media | en_US |
dc.subject.other | Geosciences | en_US |
dc.subject.other | Geochemistry | en_US |
dc.subject.other | Biochemistry, General | en_US |
dc.subject.other | Soil Science & Conservation | en_US |
dc.subject.other | Terrestrial Pollution | en_US |
dc.subject.other | Atmospheric NO3− Deposition | en_US |
dc.subject.other | Ecosystem N Cycling | en_US |
dc.subject.other | Microbial N Retention | en_US |
dc.subject.other | N Saturation | en_US |
dc.subject.other | 15 N Tracer | en_US |
dc.subject.other | Plant N Retention | en_US |
dc.title | Anthropogenic N deposition and the fate of 15 NO 3 − in a northern hardwood ecosystem | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Natural Resources and Environment | en_US |
dc.subject.hlbsecondlevel | Ecology and Evolutionary Biology | en_US |
dc.subject.hlbsecondlevel | Molecular, Cellular and Developmental Biology | en_US |
dc.subject.hlbtoplevel | Health Sciences | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI, 48109-1115, USA; Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, 48109-1048, USA | en_US |
dc.contributor.affiliationum | School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI, 48109-1115, USA | en_US |
dc.contributor.affiliationum | School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI, 48109-1115, USA; Department of Biological Sciences, University of New England, Biddeford, ME, 04005, USA | en_US |
dc.contributor.affiliationother | School of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI, 49931-1295, USA | en_US |
dc.contributor.affiliationother | School of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI, 49931-1295, USA | en_US |
dc.contributor.affiliationumcampus | Ann Arbor | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/42478/1/10533_2004_Article_5147148.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1023/B:BIOG.0000031045.24377.99 | en_US |
dc.identifier.source | Biogeochemistry | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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