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Erin Shott
Clean Air Day is a chance to look at the impact of air pollution, not just on our physical and mental health, but the overall health of our natural environment.
Air pollution often poses the biggest danger to internationally rare habitats.
68% of our most sensitive habitats are impacted by excess nitrogen, like the temperate rainforests found along the west coast of Britain.
Thriving in areas where there is a high annual rainfall with relatively constant temperatures, our temperate rainforests are full of wonder and mossy goodness, capturing imaginations and lifting spirits of visitors.
However, they are more than just woodlands; it’s a mosaic of trees, open glades, crags, ravines, rocks and gorges. With surfaces absolutely bursting with liches, mosses, liverworts and a variety of fungi; they support a vast array of insects, birds and other wildlife, absorb carbon and slow the flow of floodwaters.
Nitrogen gases in air pollution have the potential to destroy these beautiful places. This pollution can take the form of ammonia emissions from farm manures and fertilisers, or nitrogen oxide emissions from fossil fuels.
Even rainforest areas far from the source of pollution, such as the northwest coast of Scotland, are affected by this threat as it can travel long distances in the atmosphere.
In fact, data shows that most areas of temperate rainforest in Britain have exceeded what is known as critical load. Critical load refers to the maximum amount of pollutants that something (either a person or habitat) can be exposed to before significant harmful impacts start to occur.
This map shows how the temperate rainforest zone (the area in which we would expect to see temperate rainforest sites) has been impacted by this overabundance of nitrogen from ongoing air pollution. Almost all of the rainforest in England and Wales – and almost half in Scotland – has exceeded the critical load. In total, 66% of the zone has exceeded critical load, and in many areas of England and Wales the overabundance of nitrogen goes way beyond this threshold.
Impacts of nitrogen pollution will soon be evident as trees within the rainforest will temporarily show increased growth from extra nitrogen.
However, in the long term, any growth will soon stagnate as the earth becomes saturated with excess nitrogen (more than 94% of woodlands are affected UK wide!). Higher nitrogen levels mean trees will often suffer from discoloration and increased vulnerability to drought, frost, and disease like acute oak decline.
Woodland fungi are no exception to impacts of air pollution, as many are closely associated with tree roots and health.
Their loss will result in a further decline of tree species, leading to increasing carbon emissions and further contributing to the ongoing climate crisis.
A change in flora is sure to follow an increase in air pollution as tougher nitrogen-tolerant plants, such as nettles and brambles, will outcompete the more sensitive and specialist species within the rainforest. This has a cascading effect on other wildlife which rely on certain wild plants for food, shelter, and reproduction.
Losing species which make up a significant part of the rainforest ground cover, such as mosses and liverworts like Greater Whipwort, reduces the ecosystem’s ability to retain water. This makes the whole area more vulnerable to droughts and floods.
As an essential part of temperate rainforests, many lichens are incredibly sensitive to changes in air quality and require low levels of air pollution to thrive. These lichens provide food, shelter and microhabitats for invertebrates, in addition to contributing to carbon cycling and water retention.
Some rare lichen species are only found in rainforest areas and are being pushed to the brink of extinction. Without lichens, our temperate rainforests would struggle even more to survive.
Tree Lungwort Lobaria spp in particular is an amazing indicator species, as its presence signals that the forest is healthy and functioning as it should. This is because it is a slow growing species that is even more sensitive to air pollution than most other lichens.
Tree Lungwort often can become outcompeted and swamped in nitrogen-tolerant algae, knocking the ecosystem out of balance. When we see populations of lungwort recovering, we know that our air quality is improving and with that, the rainforest.
Hope is not lost! For one, you are reading this and arming yourself with information to pass onto your family and friends. When you take action on air pollution, you’re benefiting wildlife as well as people’s health – making it doubly important!
We are working hard to combat air pollution in parliament and beyond.
Want to take it a step further?
Join us at the Restore Nature Now march in London on 22nd June, to demand that future leaders prioritise nature and biodiversity. We need immediate political action to bring endangered plants and fungi back from the brink of extinction and restore species-rich habitats, like our temperate rainforest.
Find out more information about the march and how you can get involved here.
Horticultural businesses, major retailers and NGOs have come together to call on the government to legislate to end peat sales.
Hazel Gloves Fungus is a priority species on the UK Biodiversity Action Plan, learn more about this rainforest fungi this Reverse the Red month.
Living in Bristol, Rob Hodgson went on his own lichen journey, showing how anyone can go lichen hunting from anywhere.
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