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Bark lesions and sensitivity to frost in beech and Norway spruce

Publiceringsår: 2000
Språk: Engelska
Sidor: 100
Dokumenttyp: Doktorsavhandling
Förlag: Dept. of Ecology, Plant Ecology, Ecology Building, S-223 62 Lund, Sweden

Sammanfattning

Strong temperature fluctuations and pathogen attacks can cause bark lesions, visible signs of wounds in the phloem and cambium. Pathogenic insects and fungi are able to invade lesions that have not healed, further increasing the damage. The ability of the tree to withstand climatic and biotic stress can be lowered by air pollution, especially N deposition, with subsequent alterations in the soil chemistry and in the nutrient status of the tree. It was concluded that air pollution, as indicated by epiphytic lichens on the tree stem, and excess nitrogen affected the frequency of beech bark lesions. The frost sensitivity of both beech and spruce bark was related to the concentrations of nutrients in the trees. A low C/N ratio and low concentrations of Cu, K and Zn in the mineral soil were related to high frost sensitivity in beech bark. Countermeasures, such as liming and vitality fertilization, had some positive effects on the bark chemistry. A tendency towards fewer bark lesions on beech treated with lime was found, and at one of three Norway spruce sites treated with a vitality fertilizer the treated trees were less sensitive to frost than the control trees. When measuring the sensitivity of bark to frost, influences of soil treatment and site specific conditions can be hidden by a stronger influence from the freezing treatment, depending on the hardiness status of the bark. The smaller the variation in concentration of an element, the more difficult it is to detect any influence upon the frost sensitivity.

Disputation

2000-09-15
10:00
Blå Hallen at the department of Ecology, Plant ecology, Ecology Building, Sölvegatan 37, Lund
  • Satu Huttunen (Prof)

Nyckelord

  • Earth and Environmental Sciences
  • Picea abies
  • Multiple stress
  • Mineral nutrient balance
  • Liming
  • Lichen indices
  • Fagus sylvatica
  • Cryptococcus fagisuga
  • Excess nitrogen
  • Vitality fertilization
  • Plant ecology
  • Växtekologi

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

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Organisationsnummer: 202100-3211
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