Science Validates Tradition: How Moorland Management Protects Against Wildfire

Rob Beeson
5 hours ago
4 min read

✅ KEY TAKEAWAY: Traditional managed burning significantly reduces hazardous heather fuel loads, proving essential for preventing devastating summer wildfires and protecting our globally important peatland ecosystems.

A comprehensive international study has taken a close look at how fires behave on the heather-dominated moorlands of the United Kingdom and Norway. By measuring how much flammable material, or "fuel", builds up over time, scientists have developed new ways to predict how fast and intensely a moorland fire will spread.

For those who live, work, and manage the uplands, the findings confirm what generations of rural land managers have long understood.

Key Points from the Research

Unmanaged, older heather presents a severe wildfire hazard. As heather ages without being grazed or carefully burned, it builds up massive amounts of woody stems and dead material. The study found this mature heather produces the highest and most dangerous rates of fire spread.
The thick layer of moss and dead plant litter beneath the heather canopy is a major driver of fire risk. When dry, this layer acts like kindling, drastically accelerating the spread of a fire across the landscape.
Traditional managed burning is vital for protecting our landscapes. By breaking up large stands of old, highly flammable heather, land managers actively reduce the risk of catastrophic wildfires that threaten wildlife, rural livelihoods, and our globally important carbon stores.

Understanding Fuel on the Moorland

To understand wildfire risks, researchers gathered vegetation from various sites to see exactly what burns during a fire. They found that the amount of fuel on a moorland can vary wildly.

In recently managed areas, fuel loads were as low as 2.27 tonnes per hectare. However, in older, unmanaged stands, the fuel load reached a massive 62.66 tonnes per hectare.

Scientists categorized the moorland into distinct "fuel types" based on the age and height of the heather. They looked at young pioneer plants, growing building stages, and old mature heather.

The predictive models were clear: as the heather ages, the wildfire risk grows. Mature heather, with its deep and woody structure, allows fires to move incredibly fast. During high-risk dry weather, fires in these mature, unmanaged areas spread faster than in any other type of moorland vegetation.

The Hidden Danger of Moss and Litter

One of the most revealing parts of this research focuses on the ground level. Underneath the purple canopy of the heather lies a thick bed of moss and dead plant litter.

According to the study, this bottom layer makes up an average of 45% of the total fuel load on a moorland.

During the wet winter months, this moss acts like a wet sponge, making it very difficult for fires to spread deep into the ground. This is exactly why gamekeepers and land managers conduct traditional controlled burns during the colder, wetter times of the year. The wet moss protects the peaty soil underneath from the heat of the fire.

However, during spring and summer droughts, this moss layer dries out rapidly. The researchers found that when this moss and litter layer is dry, it significantly boosts the speed and intensity of a fire.

As our climate changes and dry spells become more common, managing the amount of woody heather above this moss becomes even more critical to prevent uncontrollable summer wildfires.

Protecting the Peat Beneath Our Feet

Moorlands are not just beautiful landscapes; they are working environments and vital environmental assets.

The peat soils found beneath our heather moorlands contain roughly 25% of the Earth's terrestrial carbon stock, despite covering only 2 to 3% of the planet's surface.

When a summer wildfire rips through unmanaged, mature heather, it burns exceptionally hot. This intense heat can ignite the peat soil itself, releasing massive amounts of carbon into the atmosphere and devastating the ecosystem for decades.

The study highlighted that wetter areas, such as blanket bogs, naturally have some of the lowest fire spread rates. By using controlled fire to reduce fuel loads on the drier heaths, we create natural firebreaks that stop wildfires from reaching and destroying these highly vulnerable peatlands.

A Stewardship Approach to the Future

For centuries, rural communities have managed the uplands using a careful, patchwork approach. By burning small patches of heather on a long rotation, gamekeepers create a mosaic of young, growing, and older plants.

This provides a perfect habitat for ground-nesting birds, red grouse, and grazing sheep. This new scientific research proves that this traditional mosaic is also our best defense against the modern threat of landscape-scale wildfires.

When a wildfire encounters a patch of young, recently managed heather, the fire loses energy. There is simply not enough woody fuel or deep moss to keep it going at a high speed.

If we abandon these traditional land-use practices, the moorlands will inevitably transition into unbroken seas of mature heather. As the study warns, this lack of management leads to a dangerous build-up of fuel.

True conservation requires active stewardship. This paper equips land managers with clear evidence that traditional, low-intensity agricultural practices and game management are essential. They do not just preserve the cultural heritage of our rural communities; they actively protect the land itself.