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Overview

Sequester in an independent, not-for-profit organisation which aims to increase enthusiasm for planting trees as a means to tackle the climate crisis by providing information regarding the potential carbon sequestration and the wider context. It is important to remember that the dealing with climate change requires much more than just planting trees; we all must make changes to our lifestyles such as reduction in meat and dairy consumption, travelling by green means and reducing energy use. That said we hope you find our calculator useful and enjoy planting!

Tree Carbon

Sequester uses data from the Woodland Carbon Code to calculate the net carbon sequestered by a planting activity and show how it grows over time. Our calculator takes into account the tree species, the area of planting, the yield class of the tree species for the planting location (to determine see below) and the management regime. We also include a 20% reduction in tree carbon sequestration in accordance with the Woodland Carbon Code’s methodology.

Soil Carbon

We also consider carbon lost and gained by the soil. During planting carbon, carbon can be lost from the soil and this is calculated based on the level of disturbance during planting (the greater the disturbance, the more soil carbon lost), the type of soil (organomineral leads to greater carbon loss than mineral) and the prior use of the land.
Soil can also sequester carbon over a tree’s lifetime if the ground is not disturbed resulting in an increase in total sequestered carbon. Soil carbon sequestration is included in our calculator if the previous land use is arable and the no thinning management regime is selected.

Establishment Emissions

In accordance with the Woodland Carbon Code, our calculator also includes several other sources of emissions including ground preparation, fencing, tree shelters, herbicide use and planting itself. By default these sources of emissions are included in the calculator but certain sources can be deselected in the Advanced Toolkit section.
The value of net sequestration is the total carbon sequestered by the trees and soil minus the emissions from the establishment and carbon lost from the soil during planting. It is important to note that as the establishment emissions and soil carbon loss occur at the start of the project, the net sequestration value can be very small or indeed negative for the first 5 years or so. Afforestation takes time and it is important to take a long view of the potential carbon removal.
Our calculations are indicative and, as such, cannot be used to claim carbon credits or any other financial reward for carbon offset. If you are interested in afforestation for this purpose, we recommend you contact the Woodland Carbon Code directly.

Planting Trees

Trees can be obtained as saplings from many wholesalers and there exists financial support from the Government for planting including the TE4 Capital Grants Scheme. Care should be taken when choosing trees to ensure the trees are suitable for the location (see Yield Class Calculation section) and that biodiversity is maintained. Planting single species of trees (monocultures) is often not recommended as they are more prone to disease and can have negative impacts on diversity. Another excellent resource is the Woodland Trust which offers mixtures of trees in packs. These packs are free for schools and community groups. To calculate the carbon sequestration from these packs, please use the Woodland Trust option in the Advanced Toolkit section.

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