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This article in JEQ

  1. Vol. 31 No. 5, p. 1694-1701
     
    Received: Aug 29, 2001
    Published: Sept, 2002


    * Corresponding author(s): Anne-Marja.Manninen@uku.fi
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doi:10.2134/jeq2002.1694

Secondary Metabolite Concentrations and Terpene Emissions of Scots Pine Xylem after Long-Term Forest Fertilization

  1. S. Turtolaa,
  2. A.-M. Manninen *a,
  3. J. K. Holopainenab,
  4. T. Levulac,
  5. H. Raitioc and
  6. P. Kainulainenab
  1. a Dep. of Ecology and Environmental Science, University of Kuopio, P.O. Box 1627, FIN-70211 Kuopio, Finland
    b MTT–Agrifood Research Finland, Plant Protection, FIN-31600 Jokioinen, Finland
    c Finnish Forest Research Institute, Kaironiementie 54, FIN-39700 Parkano, Finland

Abstract

Secondary compounds are known to be associated with the resistance of conifer xylem against insects and fungi. The effects of long-term forest fertilization with nitrogen (N) or with N, calcium (Ca), and phosphorus (P) on secondary compounds in the xylem of 50-yr-old Scots pine (Pinus sylvestris L.) trees were examined. Xylem samples were collected from trees growing in three locations in southern Finland: Vilppula, Padasjoki, and Punkaharju. Forests were fertilized every fifth (Vilppula and Padasjoki) or tenth (Punkaharju) year since the 1950s. We compared concentrations of individual and total monoterpenes and resin acids in the heartwood and sapwood of Scots pine. Terpene emissions were analyzed from the sapwood and total phenolics from the heartwood. Fertilization did not have any significant effect on the concentrations and emissions of xylem monoterpenes. Concentrations of several individual terpenes in sapwood were positively correlated with the corresponding terpene emission. The concentrations of individual resin acids (i.e., abietic and dehydroabietic) decreased significantly in Punkaharju, but increased in the sapwood of N-fertilized trees compared with control ones at Padasjoki and Vilppula. The concentrations of resin acids in the heartwood were not significantly affected by fertilization. Both fertilization treatments decreased the total phenolic concentration in the heartwood of trees growing in Padasjoki. There was a significant positive correlation between the total phenolics and total resin acid concentration. Overall, resin acids and phenolics seemed be more responsive than monoterpenes to N treatment. These results suggest that forest fertilization might cause slight changes in secondary compound concentrations of xylem, and thus might have significance in the decay resistance of wood.

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Copyright © 2002. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyPublished in J. Environ. Qual.31:1694–1701.