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You are here: Home / Data and maps / Indicators / Forest: growing stock, increment and fellings / Forest: growing stock, increment and fellings (SEBI 017) - Assessment published Feb 2015

Forest: growing stock, increment and fellings (SEBI 017) - Assessment published Feb 2015

Indicator Assessment Created 17 Feb 2015 Published 19 Feb 2015 Last modified 19 Feb 2015, 05:48 PM
Topics: ,
 
Contents
 

Indicator definition

Growing stock in forest and other wooded land, classified by forest type and by availability for wood supply, and balance between net annual increment and annual fellings of wood on forest available for wood supply.

Units

ratio fellings to increment (5)
utilisation rate (%)


Key policy question: Is forestry in Europe sustainable in terms of the balance between increment of growing stock and felling?

Key messages

The ratio of felling to increment is relatively stable and remains under 80% for most of the countries across Europe. This utilisation rate has allowed the forest stock to increase.

Forest utilisation rate per country (annual felling as a percentage of annual increment)

Chart
Data sources: Explore chart interactively
Table
Data sources: Explore chart interactively

Mean growing stock density by country

Chart
Data sources: Explore chart interactively
Table
Data sources: Explore chart interactively

Key assessment

The ratio of felling to increment is relatively stable and remains under 80% for most of the countries across Europe. This utilisation rate has allowed the forest stock to increase.

As detailed in figure 1, the amount of wood felled has been less than that planted and added as incremental growth. This has allowed a build-up of the growing stock. The growing stock in Europe is increasing from a low level after clearances for agriculture and charcoal production in recent centuries. The area of forests in Europe probably reached its lowest level at the end of the 17th and beginning of the 18th century. The ratio of felling to increment is expected to increase during the coming years. This is due to an expected increase in the demand for woody biomass as a renewable material energy source (Forest Europe, 2011).

For 43 countries, growing stock and forest area were reported. The mean growing stock in Europe (excluding the Russian Federation) is 150 m3/ha, but it varies considerably between countries, from 15 m3/ha in Iceland to 346 m3/ha in Switzerland (Figure 2). High values can be explained mainly by ecological conditions in favour of tree growth, by the protection of forest areas, by silvicultural practices, and locally by forest harvesting difficulties (Forest Europe, 2011).

This particular indicator addresses just one aspect of the sustainability of the forest sector. While maintaining felling below incremental production in the long run is a necessary condition for sustainability, from a biodiversity perspective it is not sufficient on its own. For a more comprehensive assessment, a complete set of forestry sector indicators is needed - such as the 35 indicators within six criteria used to report in the framework of Forest Europe.

NOTES

Growing stock is the stem volume of living trees.

Data sources

Policy context and targets

Context description

Growing stock is one of the basic statistics of any forest inventory and useful for various purposes. The standing volume of growing stock can by applying biomass expansion factors be converted into estimates of above and below-ground woody biomass. Data on growing stock, increment and fellings are crucial for the calculation of carbon budgets in the forest sector.

Relation of the indicator to the focal area

The balance between increment and fellings highlights the sustainability of timber production over time as well as the current availability and the potential for future availability of timber. For a long-run sustainability the annual fellings must not exceed the net annual increment.

An increase in the growing stock, relative to forest area, is an indication of maturing forests. The balance between the growth and felling in production forests is the best indicator to understand both potential for wood production possibilites, and conditions of biodiversity, health, recreation and other functions of forests. The quality of this indicator with regard to biodiversity would improve considerably if suggestions for improvements (see below) would be implemented.

Targets

EU 2020 biodiversity target 3

Related policy documents

  • EU 2020 Biodiversity Strategy
    in the Communication: Our life insurance, our natural capital: an EU biodiversity strategy to 2020 (COM(2011) 244) the European Commission has adopted a new strategy to halt the loss of biodiversity and ecosystem services in the EU by 2020. There are six main targets, and 20 actions to help Europe reach its goal. The six targets cover: - Full implementation of EU nature legislation to protect biodiversity - Better protection for ecosystems, and more use of green infrastructure - More sustainable agriculture and forestry - Better management of fish stocks - Tighter controls on invasive alien species - A bigger EU contribution to averting global biodiversity loss

Methodology

Methodology for indicator calculation

Definition of terms:

Growing stock:

The living tree component of the standing volume.
The standing volume refers to the volume of standing trees, living or dead, above-stump measured overbark to top (0 cm). Includes all trees with diameter over 0 cm diameter breast height (d.b.h. -- typically at 130 cm above stump). Includes: tops of stems, large branches, dead trees lying on the ground which can still be used for fibre or fuel. Excludes: Small branches, twigs and foliage. (UNECE/FAO (2000)).

Gross annual increment:

Average annual volume of increment over the reference period of all trees, measured to a minimum d.b.h. of 0 cm. Includes: the increment on trees which have been felled or die during the reference period (UNECE/FAO (2000)).

Net annual increment:

Average annual volume over the given reference period of gross increment less that of natural losses on all trees to a minimum diameter of 0 cm (d.b.h.) (UNECE/FAO (2000)).

Annual fellings:

Average annual standing volume of all trees, living or dead, measured overbark to a minimum diameter of 0 cm (d.b.h.) that are felled during the given reference period, including the volume of trees or parts of trees that are not removed from the forest, other wooded land or other felling site. Includes: silvicultural and pre-commercial thinnings and cleanings left in the forest; and natural losses that are recovered (harvested) (UNECE/FAO (2000)).
Various methods exist in countries to estimate fellings. Fellings are measured from the standing trees, already felled trees, at factory gates, or a combination of techniques. Typically a problem is posed by estimates of fellings for energy and especially the fraction of fellings for domestic firewood. Another issue in some countries is illegal logging and ranges for the volume of illegally felled wood is difficult to assess and with a large error margin.
Combined with forest scenario modelling, it is also possible to create cautious outlooks into the future development of this indicator. Such data are developed under auspices of UN-ECE/FAO as part of its European Forest Sector Outlook Studies (formerly: European Timber Trends Studies).

Measurement units for growing stock:

Status: m3.
Changes: m3/yr.
Status: m3/ha.
Changes: m3/ha/yr.

Measurement units for increment and fellings:

Status: m3.
Changes: m3/yr.

Methodology for gap filling

N/A

Methodology references

Uncertainties

Methodology uncertainty

No uncertainty has been specified

Data sets uncertainty

No uncertainty has been specified

Rationale uncertainty

MAIN DISADVANTAGES OF THE INDICATOR

  • Growing stock, increment and fellings have only indirect linkages to biodiversity, but these linkages are strong especially when considered relative to the forest area. The balance between fellings and increment is primarily an indicator for long-term sustainability of use of woody forest resources and of forest cover. If fellings are lower than increment - which at present generally is the case in Europe - this indicates that forest volume is increasing and probably also that forests are getting older before felling, both indications to be interpreted as beneficial to forest species adapted to more mature forest stages.
  • The indicator should be interpreted carefully, for example fast-growing non native species, fertilisation etc. may contribute to increase in growing stock, but may also be detrimental to biodiversity.

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.

Forest certification was discussed as a possible indicator for sustainable forest management. Although there is a close connection between criteria and indicators and forest certification, i.e. both are promoting sustainable forest management, forest certification was not selected as indicator of area of sustainable managed forest. Certification is a voluntary, market driven tool, an assurance of conformity with a set of agreed standards, and does not suit long-term monitoring of changes in the forest. Moreover, it is restricted to multipurpose and plantation forests. Even non-certified forests could be sustainable managed.

More information about this indicator

See this indicator specification for more details.

Generic metadata

Topics:

Biodiversity Biodiversity (Primary topic)

Tags:
biodiversity | nature and biodiversity | forests | forestry | deadwood | increment | felling | forest
DPSIR: Pressure
Typology: Descriptive indicator (Type A - What is happening to the environment and to humans?)
Indicator codes
  • SEBI 017
Dynamic
Temporal coverage:
1990, 2000, 2010
Geographic coverage:
Albania, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Georgia, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Luxembourg, Malta, Moldova, Montenegro, Netherlands, Norway, Poland, Portugal, Romania, Russia, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, The Former Yugoslav Republic of Macedonia, Turkey, Ukraine, United Kingdom

Contacts and ownership

EEA Contact Info

Katarzyna Biala

Ownership

EEA Management Plan

2014 1.7.4 (note: EEA internal system)

Dates

Frequency of updates

Updates are scheduled every 3 years

Related content

Related briefings

European Environment Agency (EEA)
Kongens Nytorv 6
1050 Copenhagen K
Denmark
Phone: +45 3336 7100