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  Biological soil crusts accelerate the nitrogen cycle through large NO and HONO emissions in drylands

Weber, B., Wu, D., Tamm, A., Ruckteschler, N., Rodríguez-Caballero, E., Steinkamp, J., et al. (2015). Biological soil crusts accelerate the nitrogen cycle through large NO and HONO emissions in drylands. Proceedings of the National Academy of Sciences of the United States of America, 112(50), 15384-15389. doi:10.1073/pnas.1515818112.

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 Creators:
Weber, Bettina1, Author              
Wu, Dianming2, Author              
Tamm, Alexandra1, Author              
Ruckteschler, Nina1, Author              
Rodríguez-Caballero, Emilio1, Author              
Steinkamp, Jörg3, Author
Meusel, Hannah1, Author              
Elbert, Wolfgang1, Author              
Behrendt, Thomas3, Author
Sörgel, Matthias2, Author              
Cheng, Yafang1, Author              
Crutzen, Paul J.4, Author              
Su, Hang1, Author              
Pöschl, Ulrich1, Author              
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              
2Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826286              
3external, ou_persistent22              
4Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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 Abstract: Reactive nitrogen species have a strong influence on atmospheric chemistry and climate, tightly coupling the Earth's nitrogen cycle with microbial activity in the biosphere. Their sources, however, are not well constrained, especially in dryland regions accounting for a major fraction of the global land surface. Here, we show that biological soil crusts (biocrusts) are emitters of nitric oxide (NO) and nitrous acid (HONO). Largest fluxes are obtained by dark cyanobacteria-dominated biocrusts, being similar to 20 times higher than those of neighboring uncrusted soils. Based on laboratory, field, and satellite measurement data, we obtain a best estimate of similar to 1.7 Tg per year for the global emission of reactive nitrogen from biocrusts (1.1 Tg a(-1) of NO-N and 0.6 Tg a(-1) of HONO-N), corresponding to similar to 20% of global nitrogen oxide emissions from soils under natural vegetation. On continental scales, emissions are highest in Africa and South America and lowest in Europe. Our results suggest that dryland emissions of reactive nitrogen are largely driven by biocrusts rather than the underlying soil. They help to explain enigmatic discrepancies between measurement and modeling approaches of global reactive nitrogen emissions. As the emissions of biocrusts strongly depend on precipitation events, climate change affecting the distribution and frequency of precipitation may have a strong impact on terrestrial emissions of reactive nitrogen and related climate feedback effects. Because biocrusts also account for a large fraction of global terrestrial biological nitrogen fixation, their impacts should be further quantified and included in regional and global models of air chemistry, biogeochemistry, and climate.

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 Dates: 2015-12-15
 Publication Status: Published in print
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 Identifiers: ISI: 000366404200055
DOI: 10.1073/pnas.1515818112
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Title: Proceedings of the National Academy of Sciences of the United States of America
  Abbreviation : PNAS
Source Genre: Journal
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Publ. Info: Washington, D.C. : National Academy of Sciences
Pages: - Volume / Issue: 112 (50) Sequence Number: - Start / End Page: 15384 - 15389 Identifier: ISSN: 0027-8424
CoNE: https://pure.mpg.de/cone/journals/resource/954925427230