ArticleFrontiers in microbiology2026
Concomitant responses of free-living nitrogen fixation and diazotrophic community composition to soil moisture in two soils.
Article in Frontiers in microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Free-living nitrogen fixation (FLNF) in soil is an important but still poorly constrained source of nitrogen input to terrestrial ecosystems. Although moisture is widely recognized as a major driver of soil FLNF, mechanisms underlying the moisture-related variation in FLNF remain unclear. Here, we investigated the responses of soil FLNF to a controlled moisture gradient ranging from 20 to 100% of water holding capacity (WHC) in a cropland soil and a forest soil. Our results showed that potential FLNF rates increased non-linearly with increasing soil moisture, rising by more than two orders of magnitude at 60% (cropland soil) and 80% (forest soil) WHC relative to drier treatments. In contrast to FLNF, soil respiration declined at the wetter end of the gradient, a pattern consistent with increasing aeration constraints. Together, the divergent moisture dependences of FLNF and respiration support the hypothesis that reduced oxygen inhibition on nitrogenase may have contributed to the high FLNF under wet conditions. Furthermore, moisture-related changes in FLNF coincided with shifts in both total (DNA-based) and active (RNA-based) diazotrophic community composition. In particular,
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