Controlled burn

From Wikipedia, the free encyclopedia
Prescribed fire in ponderosa pine forest in eastern Washington, United States, to restore ecosystem health
Firing the woods in a South Carolina forest with a custom made driptorch mounted on an ATV. The device spits flaming fuel oil from the side, instantly igniting the leaf litter.
A prescribed burn in a Pinus nigra stand in Portugal
Near Holmen, Wisconsin
An aerial view of a controlled burn in Helderberg Nature Reserve in South Africa bordering the city of Cape Town. In South Africa controlled burns are important for maintaining the ecological health of indigenous fynbos as well as reducing the intensity of future burns.
Controlled burn in Hokkaido, Japan

A controlled or prescribed (Rx) burn, which can include hazard reduction burning,[1] backfire, swailing or a burn-off,[2] is a fire set intentionally for purposes of forest management, fire suppression, farming, prairie restoration or greenhouse gas abatement. A controlled burn may also refer to the intentional burning of slash and fuels through burn piles.[3] Fire is a natural part of both forest and grassland ecology and has been used by indigenous people across the world for millennia to promote biodiversity and cultivate wild crops.

Hazard reduction or controlled burning is conducted during the cooler months to reduce fuel buildup and decrease the likelihood of more dangerous, hotter fires.[4] Controlled burning stimulates the germination of some desirable forest trees and reveals soil mineral layers which increases seedling vitality. In grasslands, controlled burns are conducted in early spring, after invasive species have emerged but before native species begin growing. This shifts the species assemblage to primarily native grassland species. Some cones, such as those of lodgepole pine, sequoia and many chaparral shrubs are pyriscent, meaning heat from fire opens the cones to disperse seeds.

In industrialized countries, controlled burning regulations and permits are usually overseen by fire control authorities.

Uses[edit]

Pile burn

Forestry[edit]

Controlled burning reduces fuels, may improve wildlife habitat,[5] controls competing vegetation,[6] improves short term forage for grazing, improves accessibility, helps control tree disease, and perpetuates fire dependent species.[7][8] To improve the application of prescribed burns for conservation goals, which may involve mimicking historical or natural fire regimes, scientists assess the impact of variation in fire attributes.[9] Parameters measured are fire frequency, intensity, severity, patchiness, spatial scale and phenology.[10]

Furthermore, controlled fire can be used for site preparation when mechanized treatments are not possible because of terrain that prevents equipment access.[11][12] Species variation and competition can drastically increase a few years after fuel treatments because of the increase in soil nutrients and availability of space and sunlight.[13]

Many trees depend on fire as a way to clear out other plant species and release their seeds. The giant sequoia, among other fire-adapted conifer species, depends on fire to reproduce. [14] The cones are pyriscent so they will only open after exposed to a certain temperature. This reduces competition for the giant sequoia seedlings because the fire has cleared non fire-adapted, competing species.[15][16] Pyriscent species benefit from moderate-intensity fires in older stands however, climate change is causing more frequent high intensity fires in North America.[17] Controlled burns can manage the fire cycle and the intensity of regenerate fires in forests with pyriscent species like the boreal forest in Canada.

Eucalyptus regnans or mountain ash of Australia also shows a unique evolution with fire, quickly replacing damaged buds or stems in the case of danger[citation needed]. They also carry their seeds in capsules which can be deposited at any time of the year[citation needed]. During a wildfire, the capsules drop nearly all of their seeds and the fire consumes the eucalypt adults, but most of the seeds survive using the ash as a source of nutrients. At their rate of growth, they quickly dominate the land and a new, like-aged eucalyptus forest grows.[18] Other tree species like poplar can easily regenerate after a fire into a like-aged stand from a vast root system that is protected from fires because it is underground.[19]

Agriculture[edit]

In the developing world, the use of controlled burns in agriculture is often referred to as slash and burn. In industrialized nations, it is seen as one component of shifting cultivation, as a part of field preparation for planting. Often called field burning, this technique is used to clear the land of any existing crop residue as well as kill weeds and weed seeds. Field burning is less expensive than most other methods such as herbicides or tillage, but because it produces smoke and other fire-related pollutants, its use is not popular in agricultural areas bounded by residential housing.[20]

Prescribed fires are broadly used in the context of woody plant encroachment, with the aim of improving the balance of woody plants and grasses in shrublands and grasslands.[21][22][23][24]

In Northern-India, especially, In Punjab, Haryana, and Uttar Pradesh, unregulated burning of agricultural waste is a major problem. Smoke from these fires leads to degradation in environmental quality in these states and the surrounded area.[25]

In East Africa, bird densities increased months after controlled burning had occurred.[26]

Grassland restoration[edit]

Native grassland species in North America and Australia are adapted to survive occasional low intensity fires[27]. Controlled burns in prairie ecosystems mimic low intensity fires that shift the composition of plants from non-native species to native species[28]. These controlled burns occur during the early spring before native plants begin actively growing, when soil moisture is higher and when the fuel load on the ground is low[29] to ensure that the controlled burn remains low intensity.

Greenhouse gas abatement[edit]

Controlled burns on Australian savannas can result in a long-term cumulative reduction in greenhouse gas emissions. One working example is the West Arnhem Fire Management Agreement, started to bring "strategic fire management across 28,000 square kilometres (11,000 sq mi) of Western Arnhem Land" to partially offset greenhouse gas emissions from a liquefied natural gas plant in Darwin, Australia. Deliberately starting controlled burns early in the dry season results in a mosaic of burnt and unburnt country which reduces the area of stronger, late dry season fires;[30][31] it is also known as "patch burning".

Procedure[edit]

Firefighters light, then extinguish a controlled burn in response to the 2020 Creek Fire in California.

Depending on the context and goals of a controlled burn, additional planning may be necessary. While the most common driver of fuel treatment is the prevention of loss of human life, certain parameters can also be changed to promote biodiversity and to rearrange the age of a stand or the assemblage of species.

Back burning is the term given to the process of lighting vegetation in such a way that it has to burn against the prevailing wind. This produces a slower moving and more controllable fire. While controlled burns utilize back burning during planned fire events to create a "black line", back burning or backfiring is also done to stop a wildfire that is already in progress. Firebreaks are also often used as an anchor point to start a line of fires along natural or man-made features such as a river, road or a bulldozed clearing.[32]

To minimize the impact of smoke, burning should be restricted to daylight hours whenever possible.[33] Furthermore, in temperate climates, it is important to burn grasslands and prairies before native species begin growing for the season so that only non-native species, which send up shoots earlier in the spring, are affected by the fire.[28]

Ground ignition[edit]

Slash pile burning[edit]

There are several different methods used to burn piles of slash from forestry operations. Broadcast burning is the burning of scattered slash over a wide area. Pile burning is gathering up the slash into piles before burning. These burning piles may be referred to as bonfires. High temperatures can harm the soil, damaging it physically, chemically or sterilizing it. Broadcast burns tend to have lower temperatures and will not harm the soil as much as pile burning,[34] though steps can be taken to treat the soil after a burn. In lop and scatter burning, slash is left to compact over time, or is compacted with machinery. This produces a lower intensity fire, as long as the slash is not packed too tightly.[34]

The risk of fatal fires that stem from burning slash can also be reduced by proactively reducing ground fuels before they can create a fuel ladder and begin an active crown fire. Predictions show thinned forests lead to a reduction in fire intensity and flame lengths of forest fires compared to untouched or fire-proofed areas.[35]

Grassland or prairie burning[edit]

In Ontario, Canada, controlled burns are regulated by the Ministry of Natural Resources and only trained personnel can plan and ignite controlled burns within Ontario's fire regions or if the Ministry of Natural Resources in involved in any aspect of planning a controlled burn.[36] The team performing the prescribed burn is divided into several roles; the Burn Boss, Communications, Suppression and Ignition.[37] The planning process begins by submitting an application to a local fire management office and after approval, applicants must submit a burn plan several weeks prior to ignition.[36] On the day of the controlled burn, personnel meet with the Burn Boss and discuss the tactics being used for ignition and suppression, health and safety precautions and the weather and fuel moisture for the day. On site, local fire control authorities are notified by telephone about the controlled burn while the rest of the fills drip torches with pre-mixed fuel and suppression packs with water. Driptorches are canisters filled with fuel and a wick at the end that is used to ignite the lines of fire. During ignition, the Bun Boss relays information about the fire (flame length, flame height, the percent of ground that has been blackened) to the Communications Officer who documents this information. Once the ignition phase has ended in a section, the suppression team "mops up" by using suppression packs to suppress smoldering material. Other tools used for suppression are RTVs equipped with a water tank and a pump and hose that is installed in a nearby body of water. Finally, once the mop up has finished, the Burn Boss declares the controlled burn over and local fire authorities are notified.[37]

Northern California fire crews start a backfire to stop the Poomacha fire from advancing westward.[38]

Aerial ignition[edit]

Airplane in Western Australia performing aerial ignition

Aerial ignition is a type of controlled burn where incendiary devices are released from aircraft.[39]

History[edit]

There are two basic causes of wildfires. One is natural, mainly through lightning, and the other is human activity.[40] Controlled burns have a long history in wildland management. Pre-agricultural societies used fire to regulate both plant and animal life. Fire history studies have documented regular wildland fires ignited by indigenous peoples in North America and Australia[41][42] prior to the establishment of colonial law and fire suppression. Native Americans frequently used fire to manage natural environments in a way that benefited humans and wildlife, starting low-intensity fires that released nutrients for plants, reduced competition, and consumed excess flammable material that otherwise would eventually fuel high-intensity, catastrophic fires.[43][44][45][46]

Fires, both naturally caused and prescribed, were once part of natural landscapes in many areas. In the US, these practices ended in the early 20th century, when federal fire policies were enacted with the goal of suppressing all fires.[42] Since 1995, the US Forest Service has slowly incorporated burning practices into its forest management policies.[47]

Fire suppression has changed the composition and ecology of North American habitats, including highly fire-dependent ecosystems such as oak savannas[48][49] and canebrakes,[50][51] which are now critically endangered habitats on the brink of extinction. In the Eastern United States, fire-sensitive trees such as the red maple are increasing in number, at the expense of fire-tolerant species like oaks.[52]

Controversies[edit]

The Oregon Department of Environmental Quality began requiring a permit for farmers to burn their fields in 1981, but the requirements became stricter in 1988 following a multi-car collision[53] in which smoke from field burning near Albany, Oregon, obscured the vision of drivers on Interstate 5, leading to a 23-car collision in which 7 people died and 37 were injured.[54] This resulted in more scrutiny of field burning and proposals to ban field burning in the state altogether.[55][56]

In the European Union, burning crop stubble after harvest is used by farmers for plant health reasons under several restrictions in cross-compliance regulations.[57]

With controlled burns, there is also a risk that the fires get out of control. For example, the Calf Canyon/Hermits Peak Fire, the largest wildfire in the history of New Mexico, was started by two distinct instances of controlled burns, which had both been set by the US Forest Service, getting out of control and merging.[58]

Muir burn in UK showing smokestack
Muir burn in UK

In the north of Great Britain, large areas of grouse moors are managed by burning in a practice known as muirburn. This kills trees and grasses, preventing natural succession, and generates the mosaic of ling (heather) of different ages which allows very large populations of red grouse to be reared for shooting.[59] The peat-lands are some of the largest carbon sinks in the UK, providing an immensely important ecological service. The governments has restricted burning to the area but hunters have been continuing to set the moors ablaze, releasing a large amount of carbon into the atmosphere and destroying native habitat.[60]

The conflict of controlled burn policy in the United States has roots in historical campaigns to combat wildfires and to the eventual acceptance of fire as a necessary ecological phenomenon. Following colonization of North America, the US used fire suppression laws to eradicate the indigenous practice of prescribed fire. This was done against scientific evidence that supported prescribed burns as a natural process. At the loss to the local environment, colonies utilized fire suppression in order to benefit the logging industry.[61]

The notion of fire as a tool had somewhat evolved by the late 1970s as the National Park Service authorized and administered controlled burns.[62] Following prescribed fire reintroduction, the Yellowstone fires of 1988 occurred, which significantly politicized fire management. The ensuing media coverage was a spectacle that was vulnerable to misinformation. Reports drastically inflated the scale of the fires which disposed politicians in Wyoming, Idaho, and Montana to believe that all fires represented a loss of revenue from tourism.[62][63] Paramount to the new action plans is the suppression of fires that threaten the loss of human life with leniency toward areas of historic, scientific, or special ecological interest.[64]

There is still a debate amongst policy makers about how to deal with wildfires. Senators Ron Wyden and Mike Crapo of Oregon and Idaho have been moving to reduce the shifting of capital from fire prevention to fire suppression following the harsh fires of 2017 in both states.[65]

Tensions around fire prevention continue to rise due to the increasing prevalence of climate change. As drought conditions worsen, North America has been facing an abundance of destructive wildfires.[66] Since 1988, many states have made progress toward controlled burns. In 2021, California increased the amount of trained personnel to perform controlled burns and created more accessibility for landowners.[67]

See also[edit]

References[edit]

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Further reading[edit]

External links[edit]