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‘Maireann an craobh ar an bhfail ach ní maireann an lámh a chur’
The tree outlives the person who has planted it.
As afforestation continues in the coming years, trees will be more evident and form a greater part of the Irish landscape and environment1. As a nation with one of the lowest forest covers in Europe, we are now endeavouring to explore and ensure that trees planted in these decades will enhance and protect the Irish environment.
On a global scale, trees have many positive impacts on the environment. One only has to look to areas in the world where there has been widespread deforestation and see the resultant loss of habitat, biodiversity and species to understand the importance of forests and forest cover. Forests provide a unique habitat where many species of plants and wildlife can flourish. In addition, recent interest has focused on how trees can help reduce the accumulation of the greenhouse gas, carbon dioxide (CO2) in the atmosphere.
Although it is widely accepted that forests alone do not offer a solution to global warming; afforestation and forest management and conservation can make a positive contribution.
This contribution is achieved naturally as trees absorb and retain (sequester) carbon dioxide and release oxygen (O2) during their growth. The average rate of carbon storage in Irish plantation forests has been estimated by a recent COFORD study at approximately 3.6 tonnes of carbon per hectare per year.
Trees are planted to prevent soil erosion on steep slopes and along watercourses to enhance riparian environments. When planted along riverbanks, they provide shade and act as a food source for aquatic animals2.
However, the basic principle when planting is to choose the right tree in the right place. Bearing this principle in mind, species are chosen based on factors such as site, aspect, soil type, etc. so that they are suitable from both an economic and environmental perspective. The COFORD Species Selection Manual can be used to aid species choice. However, as the trees continue to grow the management practices employed should ensure economic, social and environmental compatibility. The principles of sustainable forest management (SFM), which form the basis for Forest Service guidelines and independent certification, help to ensure that the above criteria are adhered to in a practical way.
To conclude, the interaction of trees with the environment is of paramount importance. Environmental forest research is ongoing in Ireland examining such areas as forestry and biodiversity, forest operations and water quality and forestry and carbon storage. Such endeavours will ensure that knowledge is available on which informed decisions can be made both at national and farm level.
1 This article is an update of an earlier version by Dr Miriam Ryan (now at: Research and Graduate Studies Office, Room 7, Humanity Building, NUI Maynooth, Maynooth, Co Kildare).
2 See Forestry and Water Quality Guidelines, Forest Service, which deals with planting alongside waterways. |