There are relationships between the development of a green area and its vegetation which are very important for professional practice. The impact is two-way. Examples of aggression of the roots of some tree species against many underground devices and installations have been known for a long time; but the negative impact of some installations is also known, especially district heating, on the surrounding vegetation.
The greatest damage and destruction to the woody vegetation then occurs, when in close, cables are laid or canals are built in the vicinity of trees. In such situations, an intersection occurs 20-40% the roots. Then, the tree's physiological processes are upset, caused by limited water and nutrient uptake. It has a worse effect on the tree, if such excavation is carried out in summer, when it is difficult for the tree to get enough water. The deterioration of the situation causes a significant drying of the soil by increasing the evaporation surface. Chronic conduct of this type of work may lead to rapid dieback of the tree. The greatest losses in the forest stand of cities and housing estates are observed after running district heating mains, usually along wooded communication arteries.
These adverse consequences can be prevented by;
— zachowanie odległości prowadzenia przewodów nie mniejszej od zasięgu korony drzewa;
— zapewnienie drzewu nawodnienia i nawożenia w czasie trwania robót, in the part not affected by the excavation;
— prawidłowe wykonanie cięcia korzeni i właściwą pielęgnację ran;
— wprowadzenie do podłoża od strony wykopu substratu glebowego ułatwiającego regenerację korzeni po zasypaniu wykopu;
— zapewnienie drzewu odpowiedniej pielęgnacji w okresie 3 – 5 years after completion of works.
Threats to various elements of the infrastructure resulting from the aggression of the root system mainly consist in the penetration of the roots into the sewage pipes with small diameters or into the network of drainage pipes.. Roots get inside these lines through leaky joints and cracks. Occasionally, the fracture may be caused by pressure from the root growing near the duct. Cracks in the wires, especially made of concrete and ceramic pipes, they are very common on insufficiently stabilized land (settling) or cables laid carelessly on the ground. The roots grow very vigorously and over time they help to close the duct. Removal of this type of damage is generally not possible without, replacement of a certain section of the cable. Poplars are among the trees with great potential for growing into wires, willow trees, clones and lindens.
This type of risk can be limited, inter alia, by maintaining the permissible planting distances from various cables, and the use of appropriate materials for the cables and compliance with proper workmanship..