Prescribed Burns Show 92% Reduction in Extreme Wildfire Probability, Study Finds

A recent study published in the esteemed journal Science provides robust evidence for the efficacy of prescribed burns in mitigating the risk of extreme wildfires. The research indicates that implementing low-severity burns can lead to an immediate 92% reduction in the probability of high-severity wildfires occurring in the same location. This “vaccine effect” can last for up to a decade and extend its protective radius up to five kilometers beyond the treated zone.

The findings come at a critical time, as climate change and rural abandonment have created conditions in many regions, including Spain, where forests have become highly susceptible to intense, uncontrollable fires. These megafires not only cause ecological devastation but also release vast plumes of toxic smoke that can impact populations hundreds of kilometers away.

How Prescribed Burns Work

The core principle behind prescribed burns, also known as controlled burns, lies in managing fuel continuity. Víctor Resco de Dios, a professor of Forest Engineering and Global Change at the University of Lleida, explains that the smoke produced by these controlled events is significantly less than that from uncontrolled wildfires. When a wildfire encounters an area that has been previously managed with controlled fires, its intensity is drastically reduced. The fire is more likely to stay on the ground rather than spreading to the tree canopies, giving firefighting teams a crucial window to intervene and suppress the blaze, thereby minimizing overall smoke emission.

Impact on Air Quality

One of the most significant implications of this research, according to the study, relates to air quality. Large wildfires release fine particulate matter that poses a serious health risk to the lungs. The study’s researchers estimate that in a region like California, burning 500,000 acres annually through prescribed methods could reduce accumulated airborne microparticle pollution by approximately 10%.

Geographic Considerations and Applicability in Spain

While the study’s compelling data originates from analyses of coniferous forests in California, experts caution that direct application to other regions, such as Spain, requires careful consideration. Víctor Fernández García, an expert cited by SMC, points out that “California is not Spain.” The landscape and forest types differ significantly. In the western United States or Mexican oak forests, prescribed burns can be implemented on a landscape scale. However, in Spain, their use is currently “very puntual” and localized. This is partly due to the need for surgical precision when managing burns in Spain, where native species like Pinus nigra and Pinus pinaster are highly fire-resistant, requiring tailored approaches.

Despite these differences, the underlying principle remains valuable. Experts like Fernández García acknowledge that decades of rural abandonment in Spain have led to a significant accumulation of fuel in forests, increasing the likelihood of extreme fires. Therefore, even if not implemented on the same scale as in California, practices like low-risk fire grazing and controlled burns offer a useful warning and potential strategy for enhancing forest resilience in Spain.

Key Facts

This research underscores the critical role of proactive forest management in an era of increasing wildfire threats. The validation of prescribed burns as a scientifically supported tool for reducing extreme fire risk offers a vital strategy for land managers, policymakers, and communities seeking to protect both natural landscapes and public health from the devastating consequences of wildfires. The findings provide a strong impetus for further research and implementation of such controlled methods, adapted to local ecological conditions.

Source: Un experto forestal tiene claro el problema de España: “Hemos acumulado combustible y aumentado la probabilidad de incendios extremos” – Xataka, https://www.xataka.com/ecologia-y-naturaleza/experto-forestal-tiene-claro-problema-espana-hemos-acumulado-combustible-aumentado-probabilidad-incendios-extremos