Background: The nitrogenous compound deposited from the atmosphere to the soil is complex, but most field experiments mimic nitrogen deposition with the acid NHNO alone. Thus, whether the acid and non-acid nitrogenous compounds have similar effects on biodiversity and ecosystem functions remains understudied. We mimicked nitrogen deposition with acidic NHNO and (NH)SO, and non-acidic urea, slow-released urea and NHHCO in a temperate steppe, and quantified soil microbial taxonomic and functional gene composition with amplicon sequencing and shotgun metagenomics, respectively.
Results: While NHNO and (NH)SO significantly altered the soil microbial taxonomic and functional composition as well as their carbon decomposition potential, the other three compounds had smaller effects.
Conclusion: Our results suggested that previous nitrogen deposition experiments mimicked with NHNO or (NH)SO alone may have overestimated the effect on biodiversity and ecosystem functions in the Eurasian steppe and similar ecosystems affected by mainly nonacidic nitrogen deposition.
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| http://dx.doi.org/10.1186/s40793-022-00441-1 | DOI Listing |
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