- intercepting and absorbing rainfall which normally would fall directly on the bog
- shading out important bog vegetation in particular sphagnum mosses which are the drivers of peat formation
- enriching the bog with nutrients from leaf and brash litter
- creating root 'plates' that form dry hummocks above the natural bog surface - combined with nutrient enrichment from leaf litter these hummocks often become little islands that are ripe for other non-traditional bog species to gain a foothold
Excessive scrub growth can also affect the biodiversity of a small lowland bog. For instance the Large Heath butterfly is dependent on abundant Hare's-tail cottongrass which is it's larval foodplant. The above photo shows birch scrub encroaching into suitable Large Heath habitat. And whilst the butterfly can survive well in that situation it isn't many years before the birch will start to shade out the cottongrass and the Large Heath as is shown in the photo below.
- folding pruning saws that enable us to cut into the peat to get at roots
- mini-mattocks that help lever and cut stubborn scrub
- tree-poppers which lever up entire small trees