# Commission Regulation (EC) No 1737/2006 of 7 November 2006 laying down detailed rules for the implementation of Regulation (EC) No 2152/2003 of the European Parliament and of the Council concerning monitoring of forests and environmental interactions in the Community, Division V: Additional monitoring techniques

Extent: E+W+S+N.I.

Additional techniques (such as litterfall collection or girth band measurements) can provide supporting and supplementary information.
Litterfall sampling provides quantitative data, e.g. about flowering, seed production, leaf/needle shedding etc.
Girth bands: Continuous measurement of changes in girth can provide information on the onset and cessation of growth and on the response of trees to stress phenomena.
Throughfall chemistry can provide additional information on the occurrence of phenological phases through changes in nutrient fluxes.

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Source: https://www.legislation.gov.uk/eur/2006/1737/annex/I/chapter/12/division/V (the official version)
Page: https://openlegislation.uk/eu-regulation-2006-1737/annex-I/chapter-12/division-V
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.