A műemlékek sokszínűsége (A 28. Egri Nyári Egyetem előadásai 1998 Eger, 1998)

Előadások / Presentations - PÁRKÁNY Ildikó: Gardens of mansions

giant oak tree has a slow growth, it reaches maturity at 100 to 120 years and lives up to 200 to 220 years of age in built-up areas. Its foliage shape is classified by the so-called irregular type. With the help of this method we managed to demonstrate that a 50 year old tree's value does not equal 10 standard nursery trees. Since at present if someone cuts out an old tree he can counterbalance the fact by planting young trees. However, the fact is that a 50 year old tree can only be fully replaced by a tree of the same age. The value calculations show this fact well, because, for example a 50 year old varnish-tree (Koelreuteria paniculate) is worth 147,000 Forints while 5 standard trees cost only 5000 Forints. Thus time as a value added factor appears well when using this method. Taking the above into consideration, we have defined the growth curve characteristic for the most frequent tree types in built-up areas in our country. The graphs demonstrate how the foliage changes in size for certain types of trees from the age of 4 years (this is regarded the age when nursery trees are planted out in our country) to the beginning of ageing. The value follows the same curve, different for each type. The starting value is the average price of a nursery tree and this value increases by the growth of foliage volume. Tables demonstrate these values for users. The data show the financial value connected to the age, which changes every ten years. We show two foliage shapes as examples, together with the relevant foliage volume and the value multiplicator and they are shown by the column and irregular foliage shapes. From among green surfaces lawn can be evaluated by the size of the assimilating surface, which is able to improve the environment significantly when properly maintained. 1 square metre of lawn surface equals 0.25 cubic metre foliage assimilating surface on average. The same is true for shrub surfaces where one shrub or 1 square metre shrub surface has 0.5 cubic metre of foliage assimilating surface. By defining values we can expect that plants will be appreciated more than at present, their maintenance and handling will take place in accordance with their value and people living in built-up areas will have a nicer and pleasanter environment. Year -~- Slow growth Medium growth — Fast growth