Plant diversity did not make every soil nitrifier more drought-resistant
WHAT THE EVIDENCE SAYS
A Journal of Ecology study combined a 41-site field survey with a controlled pot experiment and 914 soil samples to test drought resistance across ammonia-oxidizing archaea, ammonia-oxidizing bacteria and complete ammonia oxidizers. Drought reduced bacterial and comammox activity more strongly than archaeal activity. Increasing plant richness strengthened archaeal resistance but weakened bacterial resistance, while comammox responses were comparatively insensitive to richness.
WHY IT MATTERS / OUR READ
Biodiversity–stability relationships can reverse depending on the microbial process being measured. For soil management, 'more diverse vegetation stabilizes nitrogen cycling' is too coarse a prediction unless the functional guild and the relevant nitrogen pathway are specified.
CAVEATS / UNCERTAINTY
The study combines field gradients with a controlled experiment, but guild-level gene and activity responses do not directly quantify whole-ecosystem nitrogen loss or greenhouse-gas emissions. Results are system- and process-specific rather than a general rule for all soils.
SOURCE
Journal of Ecology
View original evidence ↗
Field and pot experiments in China found plant richness increased drought resistance of ammonia-oxidizing archaea, reduced it for bacteria and had little direct effect on complete ammonia oxidizers.
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