438510
doi
10.5194/bg-14-1593-2017
oai:zenodo.org:438510
user-eu
Porada, P.
Bolin Centre for Climate Research, Stockholm University, 10691 Stockholm, Sweden
Pöschl, U.
Max Planck Institute for Chemistry, P.O. Box 3060, 55020 Mainz, Germany
Kleidon, A.
Max Planck Institute for Biogeochemistry, P.O. Box 10 01 64, 07701 Jena, Germany
Beer, C.
Department of Environmental Science and Analytical Chemistry (ACES), Stockholm University, 10691 Stockholm, Sweden
Beer, C.
Bolin Centre for Climate Research, Stockholm University, 10691 Stockholm, Sweden
Weber, B.
Max Planck Institute for Chemistry, P.O. Box 3060, 55020 Mainz, Germany
Estimating global nitrous oxide emissions by lichens and bryophytes with a process-based productivity model
Porada, P.
Department of Environmental Science and Analytical Chemistry (ACES), Stockholm University, 10691 Stockholm, Sweden
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
Nitrous oxide is a strong greenhouse gas and atmospheric ozone-depleting
agent which is largely emitted by soils. Recently, lichens and bryophytes
have also been shown to release significant amounts of nitrous oxide. This
finding relies on ecosystem-scale estimates of net primary productivity of
lichens and bryophytes, which are converted to nitrous oxide emissions by
empirical relationships between productivity and respiration, as well as
between respiration and nitrous oxide release. Here we obtain an alternative
estimate of nitrous oxide emissions which is based on a global process-based
non-vascular vegetation model of lichens and bryophytes. The model quantifies
photosynthesis and respiration of lichens and bryophytes directly as a
function of environmental conditions, such as light and temperature. Nitrous
oxide emissions are then derived from simulated respiration assuming a fixed
relationship between the two fluxes. This approach yields a global estimate
of 0.27 (0.19–0.35) (Tg N<sub>2</sub>O) year<sup>−1</sup> released by lichens and
bryophytes. This is lower than previous estimates but corresponds to about
50 % of the atmospheric deposition of nitrous oxide into the oceans or
25 % of the atmospheric deposition on land. Uncertainty in our simulated
estimate results from large variation in emission rates due to both
physiological differences between species and spatial heterogeneity of
climatic conditions. To constrain our predictions, combined online gas
exchange measurements of respiration and nitrous oxide emissions may be
helpful.
Zenodo
2017-03-28
info:eu-repo/semantics/article
793374
user-eu
award_title=Changing Permafrost in the Arctic and its Global Effects in the 21st Century; award_number=282700; award_identifiers_scheme=url; award_identifiers_identifier=https://cordis.europa.eu/projects/282700; funder_id=00k4n6c32; funder_name=European Commission;
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2004707
md5:270872ed1c20f17fba314d621f9299eb
https://zenodo.org/records/438510/files/bg-14-1593-2017.pdf
118311
md5:63bb1fdcdfc079fb61d8f1eab4469508
https://zenodo.org/records/438510/files/bg-14-1593-2017.xml
public
Biogeosciences
14
6
1593-1602
2017-03-28