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On-going projects

Hedgerows: Mapping the gaps

The
Challenge

The UK Government has identified afforestation as a means of contributing to national CO2 reduction targets. The Committee on Climate Change has estimated the UK needs to plant 30,000 hectares of trees per year and extend hedges by 40% by 2050. This equates to approximately 50 million trees annually and an extra 100,000 miles of hedgerow by 2050. It is currently unclear where these trees and hedges will be planted, however it is likely that the majority will be through commercial forestry, requiring large swathes of land.

eei-hedgerows-inset
The total length of hedgerows across Great Britain is estimated to be between 400,000 and 750,000 kilometres

Across the north of England, thousands of kilometres of hedgerow are fragmented by gaps. One way to maximise the available area for afforestation would be to fill in the existing gaps in hedgerows. Currently, little research has been undertaken into the potential of hedgerow gaps for this purpose, in comparison with research conducted into planting trees. Crucially, hedgerow gaps present the opportunity for afforestation, without the need for extensive land change. As the government develops new post-Brexit policy on land management, there may be additional incentives for landowners to plant hedges and fill hedgerow gaps.

The
Approach

Lead researchers

josh-wolstenholme

Project partners

Funded by Natural England - subject to final confirmation

This project aims to identify the location and size of hedgerow gaps within East Yorkshire, which would establish a baseline value of the potential space for plantation. Specifically, it will utilise freely available geospatial mapping products to accurately map the spatial characteristics of hedgerows and their gaps across the East Yorkshire region.

The project has two primary objectives; first, to develop an interactive map of the East Yorkshire region with hedgerows and gaps mapped using geographic information systems and deep learning. This will involve physically mapping a small number of one-kilometre squares to train a deep learning model that will be able to estimate where gaps and hedgerows are across the entire 2,000+ km2 area. The second is to establish a databank of high-resolution surveys of hedges and gaps to supplement objective one with additional data. The data will be available in an online web map interface where users can identify hedgerow gaps within East Yorkshire.

 

Research Team:

Josh Wolstenholme - Project Lead

Dr Giles Davidson

Katie Parsons

Dr Josh Ahmed

Dr Chun Keat Yew

Prof Dan Parsons

The Impact

The primary aim of this research is to identify and quantify hedgerows and hedgerow gaps in East Yorkshire pinpointing specific locations where hedges could be restored or trees planted within hedgerow gaps. This could potentially expedite afforestationand atmospheric carbon reduction within the region. The approach is highly scalable from the local to regional and national scales, with the potential for citizen science mapping and enhancements. As well as capturing carbon dioxide from the atmosphere, planting hedgerows is likely to benefit biodiversity and soil structure whilst also supporting natural flood management in the environment. The interactive map will also provide key information for environment specialists and professionals to support strategic conservation of natural environments and habitat recovery/restoration.

Next steps

This is a pilot project to test the effectiveness of the deep learning model in identifying hedgerow gaps. Future work will include improving the accuracy of the deep learning model, enhancing the functionality of the web map interface and rolling our the model across a wider geographic area.

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