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HERO ID
2465616
Reference Type
Journal Article
Title
Nitrogen in rock: Occurrences and biogeochemical implications
Author(s)
Holloway, JM; Dahlgren, RA
Year
2002
Is Peer Reviewed?
Yes
Journal
Global Biogeochemical Cycles
ISSN:
0886-6236
EISSN:
1944-9224
Volume
16
Issue
4
DOI
10.1029/2002GB001862
Web of Science Id
WOS:000181062900003
Abstract
[1] There is a growing interest in the role of bedrock in global nitrogen cycling and potential for increased ecosystem sensitivity to human impacts in terrains with elevated background nitrogen concentrations. Nitrogen- bearing rocks are globally distributed and comprise a potentially large pool of nitrogen in nutrient cycling that is frequently neglected because of a lack of routine analytical methods for quantification. Nitrogen in rock originates as organically bound nitrogen associated with sediment, or in thermal waters representing a mixture of sedimentary, mantle, and meteoric sources of nitrogen. Rock nitrogen concentrations range from trace levels (< 200 mg N kg(-1)) in granites to ecologically significant concentrations exceeding 1000 mg N kg(-1) in some sedimentary and metasedimentary rocks. Nitrate deposits accumulated in arid and semi- arid regions are also a large potential pool. Nitrogen in rock has a potentially significant impact on localized nitrogen cycles. Elevated nitrogen concentrations in water and soil have been attributed to weathering of bedrock nitrogen. In some environments, nitrogen released from bedrock may contribute to nitrogen saturation of terrestrial ecosystems (more nitrogen available than required by biota). Nitrogen saturation results in leaching of nitrate to surface and groundwaters, and, where soils are formed from ammonium- rich bedrock, the oxidation of ammonium to nitrate may result in soil acidification, inhibiting revegetation in certain ecosystems. Collectively, studies presented in this article reveal that geologic nitrogen may be a large and reactive pool with potential for amplification of human impacts on nitrogen cycling in terrestrial and aquatic ecosystems.
Keywords
nitrogen; volcanism; biogeochemistry; rock; weathering; diagenesis
Tags
IRIS
•
Nitrate/Nitrite
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