How much CO2 can urban forests store?

A new University College London (UCL) study, published in Carbon Balance and Management, used publicly-available airborne LiDAR (Light Detection and Ranging) data collected by the UK Environment Agency, combined with ground-based LiDAR measurements, to generate a map of carbon stored in an estimated 85,000 trees across the London Borough of Camden.

According to the researchers, urban forest can contain as much carbon as tropical rainforests. They found that areas such as Hampstead Heath store up to 178 tonnes of carbon per ha, in comparison to the median value for tropical rainforests of 190 tonnes of carbon per ha.

“The trees in our cities are important. They matter because they are close to people and are a key component of our urban environment providing beauty, shade and homes for myriad species as well as absorbing carbon and pollutants. The work being carried out at UCL is adding color and detail to this understanding,” said Sir Harry Studholme, Chair of the Forestry Commission.

LiDAR uses millions of laser pulses to build a very detailed picture of the 3D structure of trees. This allows the team to accurately estimate how much carbon the trees have absorbed via photosynthesis during their lives. It also allows them to estimate the carbon sink provided by urban trees, important for helping to offset fossil fuel emissions.

See related articles:

UK urban forest can store as much carbon as tropical rainforests

Urban ‘forests’ can store almost as much carbon as tropical rainforests

New York: Urban forestry for the next century

In New York City, urban forests are heavily used for recreation, reports the article A Plan for New York City’s Forests. Yes, Forests., recently published by The New York Times. Unfortunately, city forests in the Big Apple are at stake: Due to climate change and invasive species that can change soil conditions, they risk losing wildlife and plants. A nonprofit group called the Natural Areas Conservancy therefore focuses on how to prepare the city’s forests for a changing climate, supposing that urban forests will be affected a generation or two before differences begin to appear in rural areas. This involves planting tree species resilient to climate change and – of course – requires financial investment. “Now, in close consultation with the Parks Department, the conservancy has prepared a long-term plan for the care of the city’s forests, what it says is the first of its kind in the nation. The conservancy is eager to export it and is training other nonprofit groups in the city to use data from the survey to their advantage”, states the article. More information on how the future urban forest should look like you will find here.

How forests can help to build sustainable cities and make them climate-smart

Happy International Day of Forests – and also happy 25th anniversary to European Forest Institute! Check out our new video telling the story how forests can help to build sustainable cities and make them climate-smart.

Urban forestry in Beijing China – report and recommendations

End of January, I (the urban forestry consultant at EFI’s Resilience Programme) was invited by the Beijing Forestry and Parks Department of International Cooperation for a study visit and a training on urban forestry.  China is one of the leading countries when it comes to afforestation: in 2018 alone, about 6.6 million hectare new forests (or the size or Ireland) will be planted. The new forests are not only situated in the rural areas, but also in and near urban agglomerations. In the last Beijing province (area: 16.000 km², inhabitants: 22 million) for example, about 67.000 ha additional forest has been planted over five years, mainly for landscape and aesthetical reasons, but also for recreation purposes. In the next five years, they are aiming for an additional similar area.

Site visits

The study tour started in one of the mayor urban redevelopment projects that Beijing has seen: the 2008 Olympic Quarter. The Olympic Park (680 ha) has been built on former built-up area and farmland, and is situated at the central North-South axis through Beijing which connects the Olympic Park with the central Tiananmen Square. The park includes an artificial lake where soil was reused for building an artificial hill. The composition of the park follows the traditional Chinese design of building with the back to the hills and the front to the water.