NDLI: Does elevated nitrogen deposition or ecosystem recovery from acidification drive increased dissolved organic carbon loss from upland soil? A review of evidence from field nitrogen addition experiments

Content Provider	Springer Nature Link
Author	Evans, Chris D. Goodale, Christine L. Caporn, Simon J. M. Dise, Nancy B. Emmett, Bridget A. Fernandez, Ivan J. Field, Chris D. Findlay, Stuart E. G. Lovett, Gary M. Meesenburg, Henning Moldan, Filip Sheppard, Lucy J.
Copyright Year	2008
Abstract	Dissolved organic carbon (DOC) concentrations have risen in upland waters across large areas of Europe and North America. Two proposed drivers of these increases are (1) deposition of atmospheric pollutant nitrogen (N) with consequent effects on plant and decomposer carbon dynamics, and (2) soil recovery from acidification associated with decreasing sulphur deposition. Examination of 12 European and North American field N addition experiments showed inconsistent (positive, neutral, and negative) responses of DOC to N addition. However, responses were linked to the form of N added and to resulting changes in soil acidity. Sodium nitrate additions consistently increased DOC, whereas ammonium salts additions usually decreased DOC. Leachate chemistry was used to calculate an index of “ANC forcing” of the effect of fertilization on the acid-base balance, which showed that DOC increased in response to all de-acidifying N additions, and decreased in response to all but three acidifying N additions. Exceptions occurred at two sites where N additions caused tree mortality, and one experiment located on an older, unglaciated soil with high anion adsorption capacity. We conclude that collectively these experiments do not provide clear support for the role of N deposition as the sole driver of rising DOC, but are largely consistent with an acidity-change mechanism. It is however possible that the unintended effect of acidity change on DOC mobility masks genuine effects of experimental N enrichment on DOC production and degradation. We suggest that there is a need, more generally, for interpretation of N manipulation experiments to take account of the effects that experimentally-induced changes in acidity, rather than elevated N per se, may have on ecosystem biogeochemistry.
Starting Page	13
Ending Page	35
Page Count	23
File Format	PDF
ISSN	01682563
Journal	Biogeochemistry
Volume Number	91
Issue Number	1
e-ISSN	1573515X
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-11-07
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Nitrogen Acidity ANC Forcing Atmospheric deposition Dissolved organic carbon Manipulation experiments Life Sciences Ecosystems Environmental Chemistry Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Environmental Chemistry Water Science and Technology

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