It is estimated that in the 1990’s the Amazon absorbed up to two billion tons of CO2 each year but since then, according to the study now absorbs less than half of that.
The study was limited to primary and undisturbed forests, which makes up about 80% of the Amazon. So it doesn’t account for carbon changes, regrowth or deforestation so more research will have to be done in order to provide a more rounded result set but Lars Hedin, a professor of ecology at Princeton University suggests that the research done thus far will form an excellent springboard for a future research and understanding.
He writes: “The CO2 component of climate change may become substantially more difficult to manage and abate in the future if the findings from the Amazon basin apply more generally to the land carbon sink.”
Ian Morgan Arb is committed to Forestry conservation and growth promotion and correctly managing the trees that we have.
Students of arboricultural training in Staffordshire or elsewhere are advised to familiarise themselves with the wide range of circumstances and settings in which Chalara-infected ash trees often need to be managed.
You may, for example, wish to carry out works on trees that are protected by tree preservation orders (TPOs) and conservation areas (CAs), in which case, it will first be necessary to contact the Tree Officer in your local Planning Office, clearly specifying the trees involved and their locations. You will also need to describe the extent of the work that you are interested in carrying out, in addition to the reasons why you would like to carry out the work. This application will then be considered by the Tree Officer.
Ash trees on development sites may also require management, with any tree survey intended to support a planning application needing to include the categorisation of trees according to the criteria shown in Table 1 of British Standard 5837:2012. This is for the purpose of identifying the existing tree stock’s quality and value, so that informed decisions can be made with regard to the removal or retention of trees in the event of development work.
Deadwood can also occur in infected ash trees that are on or adjacent to highways and footpaths, posing a potential health and safety risk. This makes it crucial for trees in such a setting to be managed in a manner that places the emphasis on public safety, ensuring that action is proportionate so that there is no unnecessary pruning or felling. Safety considerations will be at the discretion of the relevant Highways Authority, taking priority with regard to the management of ash trees close to the highway.
Similar principles apply to ash trees in parks, public spaces and heritage sites, as well as on private property that is not woodland or protected by a TPO or CA. Meanwhile, when a site is home to significant ancient, veteran or isolated trees with particular merit, best practice is to clear away and dispose of nearby leaf litter during the autumn, so that the trees are best-protected from infection.
Finally, some trees – particularly those that are mature, stressed and/or damaged – provide various roosting opportunities for bats. The legal protection of bats and their roosts from disturbance, damage or destruction – even when bats are not actually present at the time the work takes place – makes it vital for a survey to be carried out establishing that the given tree is not being used as a bat roost.