Article

A recent study led by the UK Centre for Ecology & Hydrology (UKCEH) reveals that ash dieback disease, caused by the invasive Hymenoscyphus fraxineus fungus, poses a more significant threat to climate change mitigation than previously recognized. Beyond the loss of ash trees and reduced CO? absorption, the disease has triggered substantial carbon emissions from soils in affected woodlands, revealing a "triple whammy" effect on greenhouse gas dynamics.

The research team, which included experts from Lancaster University, the Woodland Trust, and the University of Oxford, utilized data from the Bunce Survey, a long-term ecological monitoring project initiated in 1972. Their findings indicate that between 2016 and 2021, British woodland soils afflicted by ash dieback released approximately 5.8 million tonnes of CO?ã figure that equates to over half the annual carbon sequestration of all broadleaf forests in Great Britain.

Lead ecologist Dr. Fiona Seaton emphasized the complexity of carbon cycling disruptions caused by ash dieback, including diminished root exudates and altered microbial communities. This degradation threatens soil organic carbon, essential for maintaining ecosystem functions and biodiversity, as the loss of ash trees compromises habitat availability for various woodland species.

With an estimated nine million ash trees already lost and projections suggesting up to 100 million more could succumb over the next three decades, the implications for carbon storage and ecosystem stability are profound. Such losses not only affect carbon dynamics but also jeopardize soil fertility and essential ecosystem services.

As tree diseases like ash dieback proliferate globally, this research underscores the urgent need to integrate these findings into climate mitigation strategies and forest management plans. Addressing these hidden carbon loss pathways is crucial for safeguarding forests' roles as carbon sinks and enhancing climate resilience.