In recent decades the living conditions of roadside trees have deteriorated, due to a series of mainly locally effective damaging factors, as a result of which numerous trees have been sentenced to a premature death. Taking as A basis the average value of each tree as 5000 dm as estimated by koch, this quickly results in a substantial annual loss for a town. Unfavourable environmental conditions negatively affect the vitality and annual growth of the trees. In an investigation carried out in hanover between 1972 and 1975 the effects of damage by de-icing salt, gas, soil compaction, ground covering with asphalt or concrete and the cutting of roots during excavations were measured by surveying the annual growth (annular rings). With the aid of this method it was possible by comparing the growth of damaged and neighbouring undamaged trees, to ascertain the point in time when damage started and to estimate the extent of the damage. The results of this survey show that in addition to the well known damaging factors of gas and salt, great damage to trees also arises from soil compaction and covering of earth surfaces with asphalt, concrete or slabs. In such cases the absence of oxygen is an important cause in the reduction of vitality of highway trees. With the aid of an annular ring analysis it is possible to detect injury at a time when the crown of a tree shows hardly any damage. (TRRL)

  • Corporate Authors:


    Postfach 4707
    Hannover 1,   Germany 
  • Authors:
    • Aslanboga, I
    • Hoester, H R
    • Meyer, F H
  • Publication Date: 1979


  • German

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 364-376
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00331386
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1981 12:00AM