NDLI: Dual isotope analyses indicate efficient processing of atmospheric nitrate by forested watersheds in the northeastern U.S.

Content Provider	Springer Nature Link
Author	Barnes, Rebecca T. Raymond, Peter A. Casciotti, Karen L.
Copyright Year	2008
Abstract	Nitrogen from atmospheric deposition serves as the dominant source of new nitrogen to forested ecosystems in the northeastern U.S. By combining isotopic data obtained using the denitrifier method, with chemical and hydrologic measurements we determined the relative importance of sources and control mechanisms on nitrate (NO3 −) export from five forested watersheds in the Connecticut River watershed. Microbially produced NO3 − was the dominant source (82–100%) of NO3 − to the sampled streams as indicated by the δ15N and δ18O of NO3 −. Seasonal variations in the δ18O–NO3 − in streamwater are controlled by shifting hydrologic and temperature affects on biotic processing, resulting in a relative increase in unprocessed NO3 − export during winter months. Mass balance estimates find that the unprocessed atmospherically derived NO3 − stream flux represents less than 3% of the atmospherically delivered wet NO3 − flux to the region. This suggests that despite chronically elevated nitrogen deposition these forests are not nitrogen saturated and are retaining, removing, and reprocessing the vast majority of NO3 − delivered to them throughout the year. These results confirm previous work within Northeastern U.S. forests and extend observations to watersheds not dominated by a snow-melt driven hydrology. In contrast to previous work, unprocessed atmospherically derived NO3 − export is associated with the period of high recharge and low biotic activity as opposed to spring snowmelt and other large runoff events.
Starting Page	15
Ending Page	27
Page Count	13
File Format	PDF
ISSN	01682563
Journal	Biogeochemistry
Volume Number	90
Issue Number	1
e-ISSN	1573515X
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-08-05
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Atmospheric deposition Nitrate processing Nitrogen Northeastern forests Stable isotopes Life Sciences Environmental Chemistry Ecosystems Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Environmental Chemistry Water Science and Technology

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