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Dietrich, Maja, 2016. The impact of ash dieback on ash regeneration in the forest reserve Dalby Söderskog. Second cycle, A2E. Alnarp: SLU, Southern Swedish Forest Research Centre



Ash dieback is affecting European ash (Fraxinus excelsior) throughout its distribution area,
threatening economical forests and associated biodiversity. Studying regeneration is important to
foresee the future development of ash. Dalby Söderskog forest reserve in Sweden was selected as a
case study to investigate the impact of ash dieback on ash regeneration. Regeneration was sampled
in 74 permanent sample plots recording two height classes (<1.3 m and ≥1.3 m, until 10 cm DBH) and
five damage classes (healthy, browsed, slightly affected, severely affected, dead). Compared to
studies in plantations or managed forests, the regeneration in Dalby natural forest is less damaged
(20% of total regeneration, 50% of regeneration ≥1.3 m). The share of healthy small ash (<1.3 m)
seems very high (77%), compared to only 5% for taller regeneration (≥1.3 m) indicating a reduced
infection pressure for small ash. Canopy cover and damage class are significantly correlated (Chi-
Square-Test) and can be described by a log-linear regression model for regeneration ≥1.3 m: An
increase in canopy cover percentage results in decreasing density of severely affected ash
regeneration. A low correlation coefficient and a low R2 (0.15) suggest more influencing factors on
damage to ash regeneration. Further research is needed to understand and predict the effects of ash
dieback. In Dalby forest, ash will most likely not persist as a major species with only 400 stems ha-1 of
healthy regeneration (≥1.3 m until 9 cm DBH) despite the comparably low damage.

Main title:The impact of ash dieback on ash regeneration in the forest reserve Dalby Söderskog
Authors:Dietrich, Maja
Supervisor:Brunet, Jörg
Examiner:Ekö, Per-Magnus
Series:Examensarbete / SLU, Institutionen för sydsvensk skogsvetenskap
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2016
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:SM001 Euroforester - Master's Programme 120 HEC
Supervising department:(S) > Southern Swedish Forest Research Centre
Keywords:ash dieback, ash regeneration, Dalby Söderskog, ecology of ash, European ash, Hymenoscyphus pseudoalbidus
Permanent URL:
Subject. Use of subject categories until 2023-04-30.:Forest injuries and protection
Deposited On:16 Feb 2016 15:47
Metadata Last Modified:16 Feb 2016 15:47

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