What it is
In two multiyear field experiments in Tibetan alpine grasslands, the authors tested how season-specific warming or drought changes the seasonal and interannual stability of plant-community biomass. Spring warming increased both seasonal and interannual stability, whereas year-round warming raised only seasonal stability, and summer drought also enhanced seasonal stability while season-specific droughts had only weak effects on interannual stability. The gains in seasonal stability came mainly from greater species-level stability, whereas the interannual stability gain under spring warming came from asynchronous responses among functional groups.
Why it matters
Studies of climate and ecosystem stability usually treat warming as uniform, leaving open how seasonally asymmetric warming or drought acts across timescales. This shows the season in which the forcing occurs is decisive: spring warming and year-round warming produced different stability outcomes, and the stabilizing mechanism differed too, with species-level stability driving seasonal stability and functional-group asynchrony driving interannual stability. That argues for seasonally explicit rather than annually averaged projections of ecosystem dynamics.
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Filed underEcosystem dynamics and resilience, Remote Sensing in Agriculture, Ecology and Vegetation Dynamics Studies