Bedrock weathering controls on terrestrial carbon-nitrogen-climate interactions
Anthropogenic nitrogen deposition is widely considered to increase CO2 sequestration by land plant communities on a global scale. Here, we suggest that bedrock nitrogen weathering contributes significantly more to nitrogen-carbon interactions than anthropogenic nitrogen deposition. This working hypo...
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Zusammenfassung: | Anthropogenic nitrogen deposition is widely considered to increase
CO2 sequestration by land plant communities on a global scale. Here, we
suggest that bedrock nitrogen weathering contributes significantly more to
nitrogen-carbon interactions than anthropogenic nitrogen deposition. This
working hypothesis is based on the application of empirical results into a
global biogeochemical simulation model from the mid-1800s to the end of
the 21st century. We demonstrate that rock nitrogen inputs have
contributed roughly 2 to 11 times more to net primary productivity gains
than nitrogen deposition since pre-industrial times. Projections based on
RCP 8.5 show that rock nitrogen inputs and biological nitrogen fixation
contribute 2 to 5 times more to terrestrial carbon uptake than
anthropogenic nitrogen deposition through year 2101. The enhancement of
carbon uptake via rock nitrogen weathering partially resolves
nitrogen-carbon discrepancies in Earth system models and offers an
alternative explanation for lack of progressive nitrogen limitation in the
terrestrial biosphere. We conclude that natural N inputs impart major
control over terrestrial CO2 sequestration in Earth’s ecosystems. |
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DOI: | 10.5061/dryad.5x69p8d1x |