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Indicator Assessment
The quantity of deadwood in Europe's forests, which is an important indicator for forest biodiversity, has strongly decreased since the middle of the nineteenth century due to intense forest exploitation and widespread burning of small wood and other debris. Since 1990, however, an overall increase in this indicator by about 4.3 % has been observed and this may be due to increased compliance with sustainable forest management principles. These principles should be considered in view of increasing wood demand, e.g. for renewable energy production.
Deadwood in Pan-European forests, 1990-2005
Note: In the period 1990-2005, an overall increase in dead wood by about 4.3 % was observed in the pan-European region (EEA, 2009), a sign of more biodiversity-friendly management.
FAO, 2005. Global Forest Resources Assessment 2005 Country tables Biomass stock in forest and other wooded land. www.fao.org/forestry/32100/en/ [Accessed 27 April 2009].
SEBI indicators, 2010 - SEBI indicator 18.
Deadwood per hectare in forests, 2005
Note: How to read the graph: in 2005, Estonian forests averaged 6 m3/ha of standing deadwood and 5 m3/ha of lying deadwood.
MCPFE, 2007.
Deadwood (coarse woody debris) is a proxy indicator for invertebrate biodiversity, since it is a habitat for a wide array of organisms. Deadwood decomposition plays a key role in the recycling of nutrients and organic matter as well as the creation of a wide variety of micro sites for regeneration of plant species and the creation of a wide variety of habitats for other organisms. The amount of deadwood is an excellent indicator of the conservation value of a forest.
Quantities of deadwood in Europe have strongly decreased between the middle of the nineteenth century and latter part of the twentieth century due to intense forest exploitation and widespread burning of small wood and other debris. Moreover, classical forest management is usually based on rotations shorter than the natural longevity of tree species. The number of large old trees, which are more likely to be a source of dead wood in the forest, is therefore relatively low. Nowadays, however, many European countries have launched initiatives to increase the amount of deadwood, though not all increases are the esult of biodiversity considerations. Available evidence suggests that the amount of deadwood increased in the pan-European region by about 4.3 % in the period 1990 - 2005. The deadwood stock in forests might decline again, however, as wood demand increases for such things as renewable energy production. Overall, deadwood in most European countries remains well below optimal levels from a biodiversity perspective.
The amount of deadwood that will naturally accumulate in forests varies greatly depending on boreal forest) up to 216 m3/ha (mixed mountain forest in central Europe) (Hahn and Christensen, 2004). In a study of boreal forests in Fennoscandia, deadwood volumes ranged from 19 m3/ha up to 145 m3/ha with values at the lower end of the range at higher latitudes near the timberline (Siitonen, 2001). In managed forests deadwood volumes can range from 2 m3/ha to 10 m3/ha (Siitonen, 2001).
In some areas the accumulation of deadwood may not be desirable, for example where the risk of insect pests (such as invasions of bark beetles) or forest fires is considered unacceptable. This occurs in Mediterranean coniferous plantations where deadwood must be removed to avoid fires.
REFERENCES
FURTHER INFORMATION
Volume of standing and lying deadwood in forest and other wooded land, classified by forest type (Ministerial Conference on the Protection of Forests in Europe (MCPFE) (MCPFE) definition). In national forest inventories, countries generally classify according to type (standing, snags, lying, species and state of decay).
No units have been specified
Deadwood (coarse woody debris) in form of snags (dead standing trees) and logs (dead lying trees) is a habitat for a wide array of organisms and after humification an important component of forest soil. Some species are dependent, during some part of their life cycle, to find a place to live, either on the surface or in cavities/protected places of dead or dying wood of moribund or dead trees (standing and fallen), or upon wood-inhabiting fungi or other species. Because of lack of deadwood in multipurpose forests many of the species dependent on deadwood are endangered.
At present it is still debated what amount of deadwood is required in order to maintain the most valuable species and under what circumstances the accumulated deadwood component may give rise to a risk for insect outbreaks.
Decaying wood habitats are important components of biodiversity in European forests and recognised as an indicator for assessing and monitoring biodiversity as well as sustainable forest management.
No targets have been specified
No related policy documents have been specified
Definition of terms:
Terminology is well defined for international reporting by MCPFE. Dead wood (coarse woody debris) as such as well as the methodology for reporting of volume are thus defined by MCPFE.
On a national scale monitoring of deadwood is carried out in several National forest Inventories (NFIs). Work towards harmonisation of terminology is carried out by the COST E43 action. This comprises type classification (standing, bending, lying) as well as potentially important additional parameter (Uprooted stems, Clearcut stems, Pieces of stems, Cut branches, Uprooted staves, Logging residues, Fine woody debris, Intact snags, Broken snags, Broken, lying stems without uprooting). There are several approaches to register state of decay, most commonly this is classified in 5 classes. Noting the tree species is desirable but data are not collected by everybody.
MCPFE has defined the following reporting of the indicator "Deadwood":
Measurement units
Figures to be reported on
Minimum length and diameter of standing and lying dead trees
Standing deadwood: 10 cm d.b.h.
Lying deadwood: 10 cm mean diameter.
Forest type
A European Forest Types classification has been proposed to MCPFE (EEA, 2006).
No methodology for gap filling has been specified. Probably this info has been added together with indicator calculation.
No uncertainty has been specified
No uncertainty has been specified
MAIN DISADVANTAGES OF THE INDICATOR
ANALYSIS OF OPTIONS
The 35 MCPFE quantitative indicators (http://www.mcpfe.org/documents/r_2007/ici)
all relate to sustainable forestry management. From this set, those with most direct relevance to biodiversity were selected.
For references, please go to https://www.eea.europa.eu/data-and-maps/indicators/forest-deadwood/forest-deadwood-assessment-published-may-2010 or scan the QR code.
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