How your old Christmas tree can be used to regenerate dune environments
Sand dunes are natural barriers which can protect our coastal towns and villages from high tides and flooding. Dunes form above the level of high tide when the plants that live in these salty, damp conditions trap wind-blown sand, which over time accumulates and increases the height and width of the dunes. Dunes are dynamic and constantly change due to varying wind speed and direction, rising sea levels or storm surges that cause waves to reach higher up the beach causing erosion. The recreational activity of visitors to the dunes can also have a significant negative effect on the natural process of their formation. Dune thatching is one method which can help preserve them.
Dune thatching involves covering the face of the dunes with bundles of straw, branches and plants and can include old Christmas trees. This technique increases sand accretion as the branches of buried plants and Christmas trees trap sediment and protect the vegetation of any new and existing dunes.
Planting Christmas Trees helps create a fence at the base of a dune and they are put in place where naturally occurring marram grass has been lost from trampling. Without marram grass, dunes can become flattened, as the wind blows in from the sea and blows the sand on the dune away. This can be a potentially big problem as dunes act as a natural sea defence in coastal areas and protect against flooding and erosion. Dunes provide a unique habitat for many important and protected plants and animals and some have a SSSI designation. Overtime, Christmas trees help to stabilise and build up dunes as they get buried by the windblown sand. Over the past 10 years, the National Trust staff have buried over 15,000 recycled Christmas trees.
Image: K A / Sand Dune Restoration / CC BY-SA 2.0
The Fylde Sand Dunes project is a partnership between the Wildlife Trust for Lancashire, Manchester and North Merseyside, Fylde Council and Blackpool council and is funded by the Environment Agency. The project aims to encourage visitors to the dunes and educate them on their importance to flood protection and wildlife conservation. Over 80% of the sand dunes in Lancashire have been lost over the past 150 years and the project aims to improve dunes as a natural sea defence. Each year, organisations such as the Wildlife Trust and National Trust host annual Christmas tree planting events at various location across the country. By recycling our old Christmas Trees we can have a great positive effect on dune environments, both in terms of protecting against coastal flooding and erosion and preserving habitats.
Over 2000 trees were donated during December 2018 and January 2019 and were planted as part of the Fylde Sand Dunes Project with the help of 250+ volunteers over three days. The Ribble Rivers Trust also appealed for Christmas Tree Donations to help prevent river bank erosion and to create habitats for invertebrates, fish and other creatures which live in rivers and streams. They collected 175 trees from Barnoldswick, 200-300 in Clitheroe and another 1500 trees were promised, all of which will be replanted and used to protect against erosion.
For information on this event and information on other news and future events, please see the Flood Hub’s News and Events page here.
Sources used: National Trust, The Wildlife Trust for Lancashire, Manchester and North Merseyside.