Trees can help mitigate ammonia emissions from farming

December 11, 2018, Centre for Ecology & Hydrology
Trees can help mitigate ammonia emissions from farming
The guidance advises what distance to plant trees from animal housing and in what configuration Credit: lakesfreerange.co.uk

A new online calculator and guidance has been developed to help farmers and others to design woodlands to capture airborne ammonia and so reduce air pollution.

Scientists from the Centre for Ecology & Hydrology worked with Forest Research to develop the free online tool and guidance for users as part of research funded by the Scottish Environment Protection Agency.

Agriculture is the main source of ammonia emissions in the UK, with the majority coming from and fertilisers.

Ammonia can lead to excess reactive nitrogen levels in sensitive habitats, causing a decline in the biodiversity of lichens, mosses and other flora. It can also lead to acidification of soils, and combines with other pollutants to produce particulate matter pollution, which is harmful to human health.

By following the advice in the guidance, farmers, regulators and planning authorities can optimise tree planting to recapture ammonia around animal housing, which is a key source of ammonia emissions. The calculator estimates the percentage of ammonia that will be recaptured by different planting options, over a set time period—up to 50 years.

The guidance advises which will thrive in different parts of the UK, what distance to plant trees from animal housing, and in what configuration. There is also information to help with the incorporation and use of existing woodlands.

The key processes by which trees can have a beneficial effect to mitigate ammonia (NH3) air pollution. Credit: CEH

Dr. Bill Bealey, an ecologist at the Centre for Ecology & Hydrology, said: "Trees are particularly effective scavengers of air pollutants like ammonia. They recapture the pollutant in the and on to the leaves, and they also help disperse the ammonia plume which reduces impacts of nitrogen pollution on nearby sensitive habitats.

"Farmers who use to mitigate ammonia can look to a long-term range of benefits. New canopies can improve by providing with shade and protection from aerial predators. They can also provide screening around animal housing units, to soften the look of buildings and minimise visibility impacts on the landscape."

Dr. Elena Vanguelova, a soil sustainability expert from Forest Research, said: "Tree shelters are an agroforestry technique that have benefits for farmers and society as a whole.

The online calculator tool estimates the percentage of ammonia captured by trees. Credit: CEH
"The capture of carbon and nitrogen by additional planting will play a role in helping the UK achieve its greenhouse gas emission reduction targets.

"Our calculator and guidance provide farmers and landowners with the information they need to use nature's best nitrogen mops to mitigate the produced by animal housing units while protecting soils, waters and the wider environment."

Explore further: Pollution: New ammonia emission sources detected from space

More information: The calculator is available free online at www.farmtreestoair.ceh.ac.uk

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