Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Volume 14, issue 4
Biogeosciences, 14, 751–754, 2017
https://doi.org/10.5194/bg-14-751-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 14, 751–754, 2017
https://doi.org/10.5194/bg-14-751-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Peer-reviewed comment 17 Feb 2017

Peer-reviewed comment | 17 Feb 2017

Nitrogen mineralization, not N2 fixation, alleviates progressive nitrogen limitation – Comment on “Processes regulating progressive nitrogen limitation under elevated carbon dioxide: a meta-analysis” by Liang et al. (2016)

Tobias Rütting Tobias Rütting
  • Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden
Publications Copernicus
Short summary
The response of ecosystems to elevated atmospheric CO2 is affected by nitrogen (N) availability. It has been hypothesized that N limitation becomes progressively stronger (progressive N limitation, PNL). Most long-term free air CO2 enrichment studies did not see a PNL. This paper shows that enhanced biological N2 fixation only prevents PNL in plant communities with symbiotic N2 fixation. In most ecosystems a stimulation of gross N mineralization prevents the development of a PNL.
The response of ecosystems to elevated atmospheric CO2 is affected by nitrogen (N) availability....
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