Crown condition dynamics of oak in southern Sweden 1988–1999

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Crown condition dynamics of oak in southern Sweden 1988–1999


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Publication Article, peer reviewed scientific
Title Crown condition dynamics of oak in southern Sweden 1988–1999
Author Sonesson, Kerstin ; Drobyshev, Igor ; Anderson, Stefan
Date 2007
English abstract
Crown defoliation of oak (Quercus robur and Q. petraea) was analysed in 808 trees during three forest condition surveys (1988, 1993, and 1999) in the southern Sweden. From 1988 to 1999 crown defoliation increased by more than 20%. Changes in crown defoliation were related to the pH in the upper 20–30 cm of the mineral soils, which was closely connected to other measures of soil fertility (cation exchange capacity, CEC and C/N ratio). Trees growing on soils with a high pH (≥4.00, in BaCl2 filtrate), high CEC and low C/N ratio had significantly lower crown defoliation than trees growing on more acid soils (pH <4.00), indicating that less favourable soil conditions may further enhance oak decline. Age did not differentiate trees with respect to crown defoliation, indicating that decline in crown condition was not due to an age-related increase in crown transparency. Considering only trees younger than 100 years, a significant interaction was observed between changes in crown defoliation and soil pH. Trees younger than 100 years old growing on more acidic soils had a greater increase in crown transparency than trees on more basic soils between 1988 and 1999. Trees ≥100 years old had significantly higher defoliation on more acidic than on more basic soils, however defoliation dynamics of these trees over 1988–99 was not related to soil acidity. Two biotic agents (insect and fungal leaf infections) evaluated in this study did not prove to be important drivers of defoliation dynamics.
DOI (link to publisher's fulltext.)
Publisher Springer
Host/Issue Environmental Monitoring and Assessment
Volume 134
Pages 199-210
Language eng (iso)
Subject Age structure
Biotic factors
Climate variation
Crown defoliation
Environmental monitoring
European hardwoods
Forest condition
Oak decline
Soil pH
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