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It’s not just trees that capture and store carbon – our meadows and grasslands can play an important role too.
If you’re taking part in No Mow May this year, then your garden will be well on its way to becoming a beautiful, biodiverse haven for nature. But there is a bonus to helping the wildflowers grow – as you allow lawn to become meadow, your garden becomes your very own carbon store, helping to reduce your carbon footprint.
When carbon sequestration is mentioned, most minds turn to trees. As a society we are more aware than ever before of the role of woodlands in combatting climate change and creating a space for nature. Much less discussed is the remarkable and equally vital role our grasslands and meadows can play in increasing biodiversity and capturing and storing carbon from the atmosphere.
When we create healthy grasslands and meadows by mowing or grazing livestock, we are simply replicating the activity of the herds of large wild herbivores that once moved across our hills and valleys. These habitats – if the grazing is gentle, infrequent and low intensity – recreate prehistoric landscapes and provide a home for our wild plants, insects, birds and fungi. Natural and semi-natural grasslands (meaning those that are farmed but in a traditional, less intensive manner) improve the quality of our water, prevent flooding and help increase the resilience of farming to summer droughts.
This grassland – and the healthy soil beneath it – also has an incredible and little-known potential to lock away atmospheric carbon. Soil carbon is a particularly valuable store; it is far more stable and long lasting than the carbon in trees, which is vulnerable to forest fires, pests and disease.
As plants live and grow, carbon from the atmosphere is drawn down into the plants’ roots, where the myriad creatures in the soil make use of it, locking it away beneath the ground. As the diversity of plants on the surface increases, so does the diversity of microorganisms, fungi and invertebrates beneath it. The more diverse the soil life, the richer the entire ecosystem – and the more carbon the soil can store.
The almost mystical role of mycorrhizal fungi is now well known. They connect roots to the nutrients in the soil, trading sugars that plants and trees create from sunlight with locked away minerals the fungi extract from the soil. We now know that plants and trees can communicate through these fungal networks, alerting them to pests and diseases and passing nutrients to others in need.
Mycorrhizal fungi have another important role – they are critical in the ability of plants to transfer carbon to the soil. In areas of farmland, meadow and garden where the soil is ploughed, fertilised or dominated by a small number of grass species, these mycorrhizal networks are much less effective – with fewer species and a lower carbon storage potential. When we look after our farmland and gardens with care, mowing and grazing infrequently and gently, avoiding ploughing and pesticides, we nurture our mycorrhizal fungi, helping the soil to become a more potent carbon store.
By taking part in No Mow May, you will not only begin to create a home for wildflowers and insects, you will also create healthier soils that nourish your garden plants – and reduce your carbon footprint in the process.
England alone has around 640,000 hectares of private garden. If just a quarter of this area was transformed into wildflower rich meadow – by mowing just once or twice a year and collecting the cuttings – then these garden soils could potentially capture and store an additional amount of carbon equivalent to more than 3 million average cars’ annual emissions within a spade’s depth, and well over 10 million cars in soils as deep as one meter*.
Lawns and gardens are of course just one part of the puzzle – the UK’s farmed grassland landscape offers tremendous potential for us to sequester carbon, while also protecting agriculture and biodiversity.
Farmers and landowners have a fundamental role to play – combining food production with sustainable grasslands that lock away carbon in healthy, ecologically rich soils. Some 40% of the UK’s land area is grassland – but much of this is intensively farmed, limiting its potential for carbon storage.
Globally, studies have suggested that 2.3-7.3 billion tons of CO2 equivalents per year could be sequestered through grassland diversity restoration. Carbon sequestration doesn’t just mean more trees. Healthy grassland, with the more sensitive grazing and less intensive farming that nourishes it, also keeps carbon out of the atmosphere.
No matter how large or small our garden, we all have a role to play, and we can all make a difference. It’s easy to get started – just put your lawnmower away this May!
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Thousands of people across the country have been letting it grow for #NoMowMay this year – and this is what it looks like!
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