Climate change and drainage effects on Pinus sylvestris: Restoring the Hydrological Memory of Forests

Ecologists currently struggle to predict how historical land alterations amplify modern heat stress in northern forests. This early-stage research, a non-peer-reviewed preprint currently hosted by Springer Nature, investigates the Naliboki Reserve in Belarus to understand the trajectory of peatland resilience.

The study analysed tree-ring widths and found that drainage networks installed in the 1960s and 1970s stripped Pinus sylvestris of its multi-year hydrological memory. Before these interventions, trees in this specific region utilised winter precipitation to buffer against spring heat. Now, heavily drained stands show immediate growth instability during dry spells, particularly during May heatwaves.

Climate change and drainage effects on Pinus sylvestris

These findings suggest that as historical drainage infrastructure in the Naliboki region gradually degrades, water tables may rise, potentially returning these forests to more stable, natural growth patterns. This transition could facilitate:

• Reduced climate sensitivity in stands where drainage is less impactful.
• Higher water tables through the natural breakdown of man-made channels.
• A return to 'natural' growth regimes that resemble pre-drainage conditions.

The data highlights a three-to-five-year lag between drought events and the resulting growth response in tree rings. While this lag confirms the long-term impact of water stress on tree development, it also underscores the importance of moisture retention. As these drainage systems fail over the coming years, the focus shifts toward allowing natural processes to stabilise these ecosystems against rising temperatures.