How Subordinate Grassland Species Outperform Dominants During Drought
A new study in Journal of Ecology reveals a critical mechanism behind ecosystem resilience to climate change. Researchers found that a subordinate grass species, Cynodon dactylon, exhibits significantly higher drought resistance than a dominant species by strategically increasing its carbon allocation below-ground. Using stable isotope tracing in field experiments, the team showed this enhanced root investment boosts nitrogen uptake and supports a distinct, active soil microbial community. This below-ground shift allows the subordinate species to maintain both plant biomass and key soil functions like nutrient cycling during water stress, a flexibility not seen in the dominant Paspalum dilatatum. The findings provide a mechanistic explanation for how biodiversity, particularly low-abundance species, stabilizes carbon cycling and ecosystem services in grasslands facing increasing drought frequency.
Study Significance: This research directly informs conservation biology and restoration ecology by identifying specific plant functional traits that confer drought resilience. For ecologists managing grassland biodiversity or modeling ecosystem responses to climate change, these results underscore that preserving subordinate species is not ancillary but central to maintaining ecosystem stability and carbon sequestration. The work offers a tangible framework for predicting which community structures will best withstand disturbance regimes, guiding more effective strategies for habitat conservation and sustainable land management.
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