top of page
10.2. Revegetation - Direct Seeding-4.jpg

Shelterbelts

Pip Courtney: When was the last time you lost sheep on a cold winter's night?
James Street: About 16 years ago.
Pip Courtney: When did you start planting trees?
James Street: 16 years ago.

Wool industry spreading the message, Landline, 2007

Free Download:

Windbreaks for Bungendore Booklet

Shelterbelt Profile.jpg
How shelterbelts work

Shelterbelts (also called windbreaks) benefit farms in multiple ways, increasing productivity and profitability, and providing ecosystem services.

The leaves, stems and trunks of trees and shrubs in a shelterbelt form a rough surface that creates friction and slows wind speeds. The height of the trees determines the wind protection zone within the shelterbelt. The higher the trees, the wider the zone of reduced windspeed. Shelterbelts should allow some air to pass through, to slow wind speed and avoid the heavy turbulence caused when wind hits a solid barrier. 

By slowing wind speeds and creating shade, shelterbelts create microclimates which can have a range of farm benefits. Windspeeds are higher towards the end of a shelterbelt so the longer the better.

Benefits of Shelterbelts

Pinus radiata_IMG_7306.jpg

“By encouraging farmers to do [planting], not only are you addressing the carbon emission issue, you’re also addressing the biodiversity issue. You’re providing habitats for bees, for honey production. You’re providing shade and shelter for animals, and in this day and age of pretty serious animal welfare accusations in the farming community, you would say that you are creating a better environment for your animals and it’s really a positive thing that you are looking after your animals.”

 

Respondent quotes from Fleming et al., Missed opportunity? Framing actions around co-benefits for carbon mitigation in Australian agriculture, Land Use Policy. 2019

Reduced wind erosion

Lower rates of soil erosion during high winds, which can be significant in dry seasons and heatwaves. This has the added benefit of reducing airborne dust.

 

Water quality and soil health

Trees act as water filters by trapping sediment and taking up excess nutrient, preventing it from entering waterways and keeping water clean. Shelterbelts sited above waterways will slow run off and sedimentation, keeping streams and dams fresher.

 

Improved pasture and crop growth rates

The combination of reduced wind speed and shade serve to lower evaporation rates, preserving soil moisture levels. More productive pastures able to carry higher stocking rates, and more water to crops means better leaf growth and fruit quality. 

 

Stock protection

Shelterbelts protect stock from cold exposure and extreme heat. Stressed stock have lower growth rates and poorer quality because they lose energy attempting to maintain body temperature. As consumers demand more ethical production, shelterbelts can demonstrate a commitment to best practices. 

 

Higher stock survival and conception rates

Sheep and cattle in sheltered paddocks have higher growth rates and are ready for market faster than unsheltered stock. Ewes protected from temperature extremes have higher conception rates and their lambs have better survival and growth rates. 

 

Pasture management

Shelterbelts can be designed to create small, high-rotation paddocks which stock can be moved through to prevent overgrazing and allow time for regrowth of grass. 

 

Habitat for pollinators and biological pest control

Pollination is critical for fruit production, but it is also valuable in pastures for seed set in nitrogen-fixing plants such as clover. Shelterbelts that provide pollen and nectar rewards help honeybees, native pollinators and birds. Some of these animals will also act as pest control agents, reducing the need for pesticide applications.

 

Wood resources

Shelterbelts can be crops in their own right, providing timber for firewood and fencing, as fodder, or used in agroforestry timber production. Honey production, fruit and nut trees can also be incorporated in shelterbelt designs. Fruit and nuts trees will need to be sited correctly and most likely need irrigation.


Amenity value

Farms with shelterbelts have higher land values, are more private and are considered more aesthetically pleasing. Attractive plantings make a property pleasant to be in.

 

Biodiversity benefits

Planting native species can boost native plant species diversity and provide habitat for native animals. Linking to remnant vegetation is a good way to create corridors and get ecosystem services such as water filtering and capture in the soil, pollination, pest control and habitat for native birds and animals.

 

Fire Protection

Shelterbelts lower windspeeds and with the right tree species choice (low-flammable leaves or deciduous trees) they can act as firebreaks. Don’t site too near structures and always ensure access for fire-fighting vehicles.

Shelterbelt.jpg

“The thing that I find with planting out shelter belts is you win on safety, you win on productivity, and you win on sort of farm appeal, so even though you're taking up some of the land, you're actually increasing your productivity so there’s no downside.”

Screen Shot 2023-05-08 at 3.00.28 pm.jpg

Above is an example of an established network of shelterbelts at Millpost, Bungendore. Note the way that the windbreaks connect remnant woodlots to make the most of existing shelter and to provide wildlife corridoors.

Work with the landscape and define natural land units.

 

  • Plant at right angles to the prevailing and damaging wind direction

In the Bungendore region, prevailing winds are predominantly from the west and east, so shelterbelts are usually best placed in north-south orientation. However, local topography can affect wind direction so be sure to confirm the prevailing wind direction. Windbreaks are best spaced at about 400 m apart. When spaced at longer distances, wind speeds increase, reducing the benefit of protection form the elements.

 

  • Reinforce the terrain

Place shelterbelts along ridges. Low lying areas are already protected from the worst winds and can be boggy and frosty.

 

  • Link existing vegetation

Stands of remnant vegetation or pre-existing shelterbelts can be built upon by incorporating them into shelterbelt design. These can be used to create wildlife corridors, bringing back bird life and other animals to the area.

 

  • Shelter highest value assets first

Choose locations that will give the greatest benefit first. 

 

For instance:

  1. Lambing and calving paddocks

  2. Holding area for newly-shorn sheep

  3. Farm house, structures and gardens

  4. Most fertile soils and paddocks

  5. Yards, roads, dusty areas

  6. Less fertile areas

 

  • Minimum size
    Plant a minimum of three rows wide. Narrow shelterbelts are porous and do not slow wind speeds effectively, nor do they provide good privacy.

 

  • Diverse plantings of different species are the best way to ensure resilience to climate variability, drought and disease.

​

​

Shelterbelts with a wide of range of species (trees and shrubs) will be better at coping with environmental stressors. Planting a mix of drought tolerant and more wet-loving species will ensure that some of the trees grow under poor and good conditions. If shelterbelts traverse different terrain (eg. down a slope) plant a mix of dry-loving species on higher slopes and shift to a wetter-loving species mix at the base. Suit species to landscape microclimates. 

 

Another advantage to mixed species shelterbelts is disease reduction. This is because there are many targets rather than one, making it harder for pathogens to find suitable hosts. Increased climate variability is expected to stress plants and make them more susceptible to disease. Changes in the climate will also see novel pests and diseases posing a new threat to trees, so planting a diverse mix could become more valuable over time.

Paddock planning to provide shade for stock are a good idea as the summers get hotter. Plantings are best done as a group of trees with fencing to prevent stock damaging trees as they establish. Selecting tree species with high canopy cover is recommended.


For more information refer to

Plan for Trees: A guide to farm revegetation on the coast and tablelands, 2nd ed., NSW Department of Primary Industries, 2006.

 

Resources

Cost of Establishment

 

Tax deductions are available for fencing and fodder storage, giving extra financial benefits to whole farm plan and development.

The Economic Benefits of Native Shelter Belts

Mason Crane on farm revegetation benefits

​

​

​

Sustainable Farms:

Native Shelterbelts

​

Sustainable Farms Shelterbelt Factsheet

​

bottom of page