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Monitoring forest damage

methods and development in Sweden

Wulff, Sören (2011). Monitoring forest damage. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2011:97
ISBN 978-91-576-7641-2
[Doctoral thesis]

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The aims of the work this thesis is based upon were to assess past and current methods of monitoring forest damage in Sweden and to propose key components of a new monitoring system that would be better adapted to the information requirements. A utilitarian perspective is adopted in the thesis, thus forest damage is defined as anything that reduces the vitality of trees in a forest or their economic value. Similarly, the term forest condition is used to describe the extent to which damage has reduced the vitality of trees, as assessed (largely) through crown defoliation.
Evaluation of the accuracy of large-scale monitoring of forest condition showed significant differences between observer teams, although on average their assessments did not significantly differ from a national standard. The results indicate that the long-term development of forest condition is the most important information that can be obtained from these kinds of inventories. Short-term fluctuations are difficult to interpret, since they may be due to extreme weather events or assessment variability. Large-scale monitoring, such as that performed in national forest inventories, has good potential for estimating geographical distributions, areas, and causes of extensive damage outbreaks. In major outbreaks even gradual changes of damage levels can be estimated with relatively high precision.
However, large-scale monitoring also has limitations. To meet current information needs, assessments of forest damage must be timely and be made at several spatial scales. Thus, in addition to broad monitoring programmes that provide time-series information on specific type of damage and their causes, there is a need for local and regional inventories adapted to specific damage events. In this way data can be obtained to support not only general strategic decisions but also specific regional and local mitigation programmes which are likely to become increasingly important following anticipated climate changes.
To meet the information needs a new Swedish forest health assessment system is proposed that includes several interacting components targeting the information requirements for strategic and operational decision-making, and accommodates a mechanism for continuously expanding the knowledge base.

Authors/Creators:Wulff, Sören
Title:Monitoring forest damage
Subtitle:methods and development in Sweden
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :18 November 2011
Number of Pages:66
Paper IWulff, S. (2002). The accuracy of forest damage assessments - Experiencies from Sweden. Environmental Monitoring and Assessment 74(3), 295-309.
Paper IIWulff, S., Hansson, P. & Witzell, J. (2006). The applicability of national forest inventories for estimating forest damage outbreak in Sweden. Canadian Journal of Forest Research-Revue Canadienne De Recherche Forestiere 36(10), 2605-2613
Paper IIIWulff, S. Roberge, C., Hedström Ringvall, A., Holm, S. & Ståhl, G. On the possibility to assess and monitor forest damage within large-scale monitoring programs - a simulation study (Manuscript).
Paper IVWulff, S., Lindelöw, Å., Lundin, L., Hansson, P., Axelsson, A-L., Barklund, P., Wijk, S. & Ståhl, G. Adapting forest health assessments to shanging perspectives on threats - a case example from Sweden. Environmental Monitoring and Assessment. DOI 10.1007/s10661-011-2130-7
Place of Publication:Umeå
Publisher:Institutionen för skoglig resurshushållning, Sveriges lantbruksuniversitet
ISBN for printed version:978-91-576-7641-2
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:K Forestry > K10 Forestry production
U Auxiliary disciplines > U40 Surveying methods
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Agrovoc terms:forest pathology, plant condition, plant diseases, monitoring, forest inventories
Keywords:Forest condition, defoliation, visual perception, national forest inventories, accuracy, precision, tree disease, long-term monitoring, target-tailored inventories
Permanent URL:
ID Code:8453
Department:(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
Deposited By: Sören Wulff
Deposited On:18 Nov 2011 15:04
Metadata Last Modified:02 Dec 2014 10:48

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