A study published in Science Advances reveals that future drought conditions may cause grasslands to lose four times more carbon uptake than current models predict. The research, led by Maud Tissink and Michael Bahn from the University of Innsbruck's Department of Ecology, underscores the compound effects of climate factors.
Unlike studies that examine individual climate variables in isolation, this work accounts for the simultaneous interplay of rising CO2, warming, and intensified drought. The authors argue that these interactions create feedback loops that amplify ecosystem stress.
The team found that the carbon sink capacity of grasslands could degrade far more rapidly under combined climate pressures. This has implications for global carbon cycle projections, as grasslands store roughly a third of terrestrial carbon.
If these findings hold, policymakers may need to revise carbon budget targets and land-management strategies. Grasslands are critical for grazing, biodiversity, and climate regulation, so their diminished carbon uptake could accelerate warming.
The study adds urgency to efforts that reduce greenhouse gas emissions and protect soil health. As Tissink noted, ignoring compound climate effects risks underestimating the scale of ecosystem disruption.